Page 1 Disk storage The T4500 and T4500C have an internal 80, 120, or 200 Megabyte (MB) Hard Disk Drive (HDD) with an average access time of 19 milliseconds. The T4600 and T4600C have an internal 120, 200, or 320 MB HDD. A 3.5-inch Floppy Disk Drive (FDD) supports 2HD floppy disks (1.44 Mbytes) and 2DD floppy disks (720 Kbytes).
Page 2 RS-232-C port The T4500/T4600 Family has one 9-pin serial interface port. Mouse port The T4500/T4600 Family has one 6-pin mouse port on the back that can be connected to an IBM PS/2 mouse. Keyboard port The T4500/T4600 Family has one 6-pin keyboard port on the back that can be connected to an IBM PS/2 keyboard.
Page 3 The T4500/T4600 Family Personal Computer is shown in Figure 1-1. The T4500/T4500C system configuration is shown in Figure 1-2, and the T4600/T4600C system configuration is shown in Figure 1-3. Figure 1-1 T4500/T4600 Family Personal Computer Figure 1-2 T4500/T4500C System Unit Configuration...
Page 4 Figure 1-3 T4600/T4600C System Unit Configuration...
Page 5: System Unit Block Diagram
System Unit Block Diagram Figure 1-4 is a block diagram of the T4500/T4500C system unit. Figure 1-4 T4500/T4500C System Board Block Diagram...
Page 6 The T4500 and T4500C system board shown in Figure 1-4 is composed of the following major components: An i486SX-20 CPU Super Integration (SI) T9901, which stores the following components: Two Direct Memory Access Controllers (DMAC): 82C37 Two Programmable Interrupt Controllers (PIC): 82C59...
Page 7 DMA Address Generator Refresh Address Generator I/O Register Compatible I/O Port Saving the data of the Register (in resume) Controller Toshiba Special Register 20 MHz/10 MHz Controller Data Bus Change Controller Data Latch Sub LCD Controller Gate Array This gate array has the following functions:...
Page 8 IC Card Controller Gate Array This gate array has the following functions: IC Card Controller PCMCIA IC Card Controller Toshiba Modem Card Controller EEPROM (for security) Controller KBC-Security-EEPROM Communication Controller Others KBC Communication Controller Disable the PRT/FDD Port, HDD Access Controller Suspend/Resume Controller The block diagram of the T4600 and T4600C system board is shown in Figure 1-5.
Page 9 The T4600 and T4600C system board shown in Figure 1-5 is composed of the following major components: An i486SL-33 CPU One Intel 82360SL This component is super set with the i486SL microprocessor and stores the following CPU peripheral components: Two DMACs 8237 equivalent Two PICs 8259 equivalent Two PITs...
Page 10 KBC/Power Supply Micro Processor Interrupt Controller IC Card Controller Gate Array This gate array has the following functions: IC Card Controller Two cards support PCMCIA Card Controller Toshiba Modem Card Controller EEPROM (for security) Controller KBC-Security-EEPROM Communication Controller Others KBC Communication Controller...
Page 11 The T4500/T4600 Family 3.5-inch Floppy Disk Drive (FDD) is a thin, high-performance reliable drive that supports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy disks. The T4500/T4600 Family FDD is shown in Figure 1-6. The specifications for the FDD are de- scribed in Table 1-1.
Page 12: Inch Hard Disk Drive
The Hard Disk Drive (HDD) is a random access non-volatile storage device. It has a non-remov- able 2.5-inch magnetic disk and mini-winchester type magnetic heads. T4500 and T4500C supports the 80 MB, 120 MB, and 200 MB. T4600 and T4600C supports the 120 MB, 200 MB, and 320 MB.
Page 13 Keyboard The 82-(USA) or 84-(European) keyboard is mounted on the T4500/T4600 Family system unit. The keyboard is connected to the keyboard controller on the system board through a 19-pin flat cable. The keyboard is shown in Figure 1-8. See Appendix F for optional keyboard configurations.
Page 14 (FL), and an FL inverter board. 1.6.1 LCD Module (T4500 & T4600) The T4500/T4600 sidelit LCD supports 640 x 480 pixels with a High Resolution Graphics Sub- system (HRGS) and 64 levels of gray. The HRGS includes the functions of the Video Graphics Array (VGA).
Page 15 1.6.2 Fluorescent Lamp (FL) Inverter Board (T4500 & T4600) The FL inverter board supplies the high frequency current needed to illuminate the FL. The specifications for the FL inverter board are described in Table 1-4. Table 1-4 FL Inverter Board Specifications...
Page 16 TFT Color LCD Display (T4500C & T4600C) The TFT Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp (FL), and an FL inverter board. 1.7.1 TFT Color LCD Module (T4500C & T4600C) The T4500C and T4600C TFT color LCD is backlit and supports 640 x 480 pixels with a High Resolution Graphics Subsystem (HRGS) and 512 colors for graphics and characters.
Page 17 1.7.2 Fluorescent Lamp (FL) Inverter Board (T4500C & T4600C) The FL inverter board supplies high frequency current to light the LCD’s Fluorescent Lamp. The specifications for the FL inverter are described in Table 1-6. Table 1-6 FL Inverter Board Specifications Item T4500C T4600C...
Page 18: Power Supply Board
Power Supply Board The power supply board supplies five kinds of voltages to the T4500/T4600 Family system board. The T4500/T4600 Family power supply board has one microprocessor and it operates at 500 KHz (power off) or 20 MHz (power on).
Page 19: Main Battery
Batteries The T4500/T4600 Family has three types of batteries: Main battery pack Backup battery Real Time Clock (RTC) battery Specifications for these batteries are listed in Table 1-8. Table 1-8 Battery Specifications Battery name Material Output voltage Capacity Main Battery...
Page 20 Battery Indicator LED The Battery Indicator LED is located next to the battery pack slot on the front of the T4500/T4600 Family computer and is identified by a battery icon. The indicator shows the status of the remov- able battery pack, power supply, and AC adapter.
Page 21 Figure 1-13 Main Battery Circuit (Nickel Metal Hydride) The T4500/T4600 Family’s main battery has three devices to prevent circuit overload. Table 1-9 shows the overload specifications. Table 1-9 Circuit Overload Protection Devices for Main Battery (Nickel Cadmium/Nickel Metal Hydride) Protection Method...
Page 22: Battery Charging Control
line. S line The power supply microprocessor determines the type of battery by whether the S line is connected to the battery circuit. If the S line is connected to the negative line, the power supply microprocessor determines that a Nickel Metal Hydride Battery is installed in the computer.
Page 23: Backup Battery
3. The battery or output voltage is abnormal. Trickle Battery Charge When the main battery is fully charged and the AC adapter is attached, the microprocessor auto- matically changes quick charge 1 or 2 to trickle charge. Detection of full charge A full charge is detected only when the battery is charging at quick charge.
Page 24 1-24...
Page 25 T4500/T4600 Family Troubleshooting Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the T4500/T4600 Family is causing the computer to malfunction. The FRUs covered are: System PCB Floppy Disk Drive Hard Disk Drive Keyboard Display Status Indicator Panel The Diagnostics Disk operations are described in Chapter 3, Tests and Diagnostics and detailed disassembly and reassembly procedures are given in Chapter 4, Replacement Procedures.
Page 26: Troubleshooting Flowchart
Ask the user if a password is registered, and if it is, ask him or her to enter it. If the user has forgotten the password, refer to Appendix H for information on password deletion. Verify with the customer that Toshiba MS-DOS is installed on the hard disk. Non-Toshiba operating systems can cause the computer to malfunction.
Page 27 Section 2.4. ceed from 0KB and 640KB? If the "Password=" message displays, type the password, then press Enter. Perform the Hard Disk Drive Trouble- Toshiba MS-DOS being loaded? shooting procedures in Section 2.6. Figure 2-1 Troubleshooting Flowchart (1 of 2)
Page 28 Do typed Perform the Keyboard Troubleshooting characters appear procedures in Section 2.7. correctly? Insert the diagnostics disk into the FDD, then run the diagnostics test program. Perform the Floppy Disk Drive Trouble- the diagnostics test program load shooting procedures in Section 2.5. properly? Perform each test.
Page 29: Power Supply Troubleshooting
Power Supply Troubleshooting The T4500/T4600 Family’s power supply controls many functions and components. To determine if the power supply is functioning properly, start with Procedure 1 and continue with the other procedures as instructed. The procedures described in this section are:...
Page 30 Adapter (AC Adapter or Desk Station) Status Meaning AC Adapter Voltage is over the maximum allowable limit. Desk Station Voltage is over the maximum allowable limit. Battery Status Meaning Charge current is over the maximum allowable limit. VCC Output Status Meaning VCC Voltage is over the maximum allowable limit.
Page 31 Power Supply Microprocessor Status Meaning Firmware error. Program error. Power Supply On/Off Sequence Status Meaning VCC and B3V error. Environment Status Meaning Temperature is over 70°C or under –20°C Check 2: When P02 is displayed, perform the following steps: 1. Make sure the Desk Station IV is firmly connected to the computer’s expansion bus port.
Page 32 Procedure 2 Battery LED Check The Battery LED, identified by a battery icon on the front of the T4500/T4600 Family computer, indicates the battery charging status. If the Battery LED indicator glows green, the AC adapter is connected and the battery is fully charged.
Page 33 If either the power supply board or the system board is damaged, replace the System PCB. Refer to Chapter 4, Replacement Procedures, for instructions on how to disassemble the T4500/ T4600 Family computer, and then perform the following check: Check 1: Replace the System PCB with a new one and restart the system.
Page 34: Procedure 1 Message Check
If an error message is shown on the display, perform Check 1. If there is no error message, go to Procedure 2. If the Toshiba MS-DOS is properly loaded, go to Procedure 3. If one of the following error messages is displayed on the screen, press the F1 key as Check 1: the message instructs.
Page 35 Check 2: If the following (a) or (b) error message is displayed on the screen, press any key as the message instructs. Error message (a) appears when data stored in RAM under the resume function is lost because the battery has become discharged. Error message (b) appears when the error is detected during a read test of the Hard RAM or the data in the Hard RAM is lost because the battery has become discharged.
Page 36 Figure 2-2 shows the printer port LED. NOTE: When you perform this check, the external FDD/PRT (T4500 and T4500C) or parallel port (T4600 and T4600C) option in the SETUP program must be set to PRT (T4500 and T4500C) or LPT1 (T4600 and T4600C).
Page 37 To use the printer port LED, follow these steps: 1. Turn off the computer’s power. 2. Plug the printer port LED into the T4500 and T4500C’s PRT/FDD connector or T4600 and T4600C’s printer connector. 3. Hold down the space bar and turn on the computer’s power.
Page 38 Table 2-3 Printer Port LED Error Status (1 of 2) Error status Test item Message Pre-init for warm start test TIMER CH.2 OUT ERROR PIT test PIT ERROR READ DATA = XXH WRITE DATA = XXH PIT initialization MEMORY REFRESH ERROR PIT function test FIRST 64KB MEMORY ERROR First 64KB memory test...
Page 39 Table 2-3 Printer Port LED Error Status (2 of 2) Error status Test item Message PIC #1 ERROR PIC test READ DATA = XXH WRITE DATA = XXH PIC #2 ERROR READ DATA = XXH WRITE DATA = XXH KEYBOARD ERROR Keyboard test KBC ERROR KBC initialization...
Page 40: Procedure 3 Diagnostic Test Program Execution Check
If an error is detected during these tests, replace the System PCB with a new one. Procedure 4 System PCB Replacement Check The System PCB may be damaged. Disassemble the T4500/T4600 Family computer following the steps described in Chapter 4, Replacement Procedures, and perform the following checks: Check 1: Replace the System PCB.
Page 41: Procedure 1 Fdd Head Cleaning Check
If the FDD still does not function properly, go to Procedure 3. If the test program cannot be executed on the T4500 series, go to Procedure 2. If the test program cannot be executed on the T4600 series, go to Procedure 4.
Page 42 Diagnostic Test Program Execution Check The floppy disk drive diagnostic test program is stored on the ASP Diagnostics Diskette. After loading Toshiba MS-DOS, run the diagnostic program. Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostic test procedures.
Page 43: Procedure 4 Connector Check And Replacement Check
Check 2: Make sure the floppy disk is formatted correctly. If it is, go to Procedure 4. Procedure 4 Connector Check and Replacement Check The 3.5-inch Floppy Disk Drive is connected to the System PCB by the FDD cable. This cable may be disconnected from the system board or damaged.
Page 44: Hard Disk Drive Troubleshooting
BACKUP procedures. Procedure 1 Partition Check Insert the Toshiba MS-DOS system disk and turn on the computer. Then perform the following checks: Type C: and press Enter. If you cannot change to Drive C, go to Check 2. If you can Check 1: change to Drive C, go to Procedure 2.
Page 45: Procedure 2 Message Check
Non-System disk or disk error Replace and press any key Check 3: Using the Toshiba MS-DOS system disk, install a system program on the hard disk using the SYS command. If the following message appears on the display, the system program has been trans- ferred to the HDD.
Page 46: Procedure 3 Format Check
HDD. If the following message appears on the display, the HDD is formatted. Format complete If any other error message appears on the display, refer to the Toshiba MS-DOS Manual for more information and perform Check 2. Check 2: Using the T4500/T4600 Family Diagnostic Disk, format the HDD with a low level format option.
Page 47 ECC recover enable Check 1: Replace the HDD unit with a new one following the instructions in Chapter 4, Re- placement Procedures. If the HDD is still not functioning properly, perform Check 2. 2-23...
Page 48: Keyboard Troubleshooting
Check 2: Replace the System PCB with a new one following the instructions in Chapter 4, Replacement Procedures. Keyboard Troubleshooting To determine if the computer’s keyboard is functioning properly, perform the following proce- dures. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: Diagnostic Test Program Execution Check Procedure 2: Connector and Replacement Check Procedure 1...
Page 49: Display Troubleshooting
Brightness and contrast may be changed by using Hot keys. If the display is blank, go to Check 1. If you cannot change the brightness and contrast, go to Check 3. NOTE: The contrast control is effective only on the T4500 or T4600 monochrome LCD. You cannot change the contrast on the T4500C or T4600C Color LCD.
Page 50 Go to Procedure 3. Procedure 3 Diagnostic Test Program Execution Check The Display Test program is stored on the ASP Diagnostics Diskette. This program checks the display controller on the system board. After loading Toshiba MS-DOS, run the Diagnostics 2-26...
Page 51 Procedure 4 Connector Check The Display unit has an LCD module, FL unit (T4500 and T4500C), LED board, Display switch, and FL inverter board. The FL unit (T4500C) and FL inverter board are connected by two cables. The LCD module and system board are connected by two signal cables as shown below. Any of these cables may be disconnected.
Page 52: Procedure 5 Replacement Check
If the FL or FL unit remains lit when the display is closed, perform Check 4. Check 1: Replace the FL (T4500 or T4600) or FL unit (T4500C or T4600C) with a new one and test the display again. If the problem still exists, perform Check 2.
Page 53: Procedure 1 Diagnostic Test Program Execution Check
Status Indicator Panel Troubleshooting To determine if the T4500/T4600 Family’s Status Indicator Panel is functioning properly, perform the following procedures. Start with Procedure 1 and continue with the other procedures as instructed. Procedure 1: Diagnostic Test Program Execution Check...
Page 54: The Diagnostic Test
The Diagnostic Test This chapter explains how to use the T4500/T4600 Family computer’s Diagnostic Test program (TESTCE45 for T4500/T4500C, TESTCE46 for T4600/T4600C) to test the functions of the com- puter’s hardware modules. The Diagnostics Program is stored on the ASP Diagnostics Diskettes, which are updated with every new product release.
Page 55: Executing The Diagnostic Test
1. Turn on the computer, and allow the computer to boot. Insert the ASP Diagnostics diskette in the computer’s internal floppy disk drive. 2. At the system prompt, change to drive A and type TESTCE45 for T4500/T4500C or TESTCE46 for T4600/T4600C, and press Enter.
Page 56 3. To display the DIAGNOSTIC TEST MENU from the DIAGNOSTICS MENU, set the highlight bar to 1, and press Enter. The following DIAGNOSTIC TEST MENU will appear: TOSHIBA personal computer T4X00 DIAGNOSTICS version X.XX (c) copyright TOSHIBA Corp. 19XX DIAGNOSTIC TEST MENU : 1 - SYSTEM TEST 2 - MEMORY TEST...
Page 57 5. Select the desired subtest number from the subtest menu and press Enter. The following message will appear: TEST LOOP : YES ERROR STOP: YES Use the arrow keys to move the cursor to the desired options and press Enter. Selecting YES for the TEST LOOP sets the test to run continuously until it is halted by the user.
Page 58: Subtest Names
Table 3-1 Subtest Names (1 of 2) Test name Subtest # Subtest item SYSTEM ROM checksum H/W status Version check MEMORY RAM constant data (T4500/T4500C RAM address pattern data only) RAM refresh Protected mode Memory module Backup memory Hard-RAM Cache memory PCMCIA memory (1 MB SRAM)
Page 59 Write specified address Read specified address PRINTER Ripple pattern Function Wraparound ASYNC Wraparound (board) Board (#1) <=> board (#2) (T4500/4500C only) Point to point (send) Point to point (receive) Card modem loopback (2400BPS) Interrupt test Sequential read Address uniqueness Random address/data Cross talk &...
Page 60: System Test
Sub-Test Menu. Table 3-2 Hardware Bit Status H/W status Reserved — — CPU clock speed (T4600/T4600C) 17 MHz 33 MHz (T4500/T4500C) 10 MHz 20 MHz Media type FDD type 1.6 MB 2 MB Reserved — —...
Page 61 Internal FDD Subtest 03 Version check This subtest checks the version level of the following four items: BIOS ROM BOOT ROM KBC version PS microprocessor version This subtest compares the current data version to the reference data version which is stored in the test program.
Page 62: Memory Test
Current data Memory Test To execute the Memory Test, select 2 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. Move the highlight bar to the subtest you want to execute and press Enter. Subtest 01 RAM Constant Data (Real Mode) This subtest writes constant data to conventional memory (0 to 640 KB).
Page 63 Number of miss hit ¯ Number of hit Fail Subtest 09 T4500/T4500C PCMCIA Memory (1 MB SPRAM) NOTE: To execute this test, a PCMCIA memory card must be installed in the computer. This subtest divides the PCMCIA window (D0000h to DFFFFh) into 64 KB incre- ments.
Page 64: Keyboard Test
T4600/T4600C: (No test item) Keyboard Test To execute the Keyboard Test, select 3 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The Keyboard test contains four subtests that test the computer’s keyboard actions. Move the highlight bar to the subtest you want to execute and press Enter.
Page 65 If test is OK, Press [Del] then [Enter] Key Subtest 02 Pressed Key Code Display When a key is pressed, the scan code, character code, and keytop name are displayed on the screen in the format shown below. The Ins, Caps Lock, Num Lock, Scroll Lock, Alt, Ctrl, Left Shift, and Right Shift keys are displayed in reverse screen mode when pressed.
Page 66 2: Continue 3: Retry Subtest 04 DCBP Connection Check NOTE: To execute the DCBP mouse connection check, a ball-point mouse must be con- nected to the Ball-point Quick Port (BPQP). This subtest checks whether a ball-point mouse is connected or not. If this test does not detect an error, it returns to the subtest menu.
Page 67: Display Test
2: Continue 3: Retry Display Test To execute the Display Test, select 4 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The Display test contains twelve subtests that test the computer’s display in various modes. Move the highlight bar to the subtest you want to ex- ecute and press Enter.
Page 68 After pressing Enter, 16 colors or 16 gray scales of mode 13h appear in the 320x200 graphics mode as shown below: 320*200 GRAPHICS DISPLAY [ 13 ] BLACK BLUE GREEN CYAN MAGENTA BROWN WHITE GRAY LIGHT BLUE LIGHT GREEN LIGHT CYAN LIGHT RED LIGHT MAGENTA YELLOW...
Page 69 Subtest 04 80x25/30 Character Display (mode 12) 80*XX CHARACTER DISPLAY 012345678901234567890123456789012345678901234567890123456789012345678901234567 !”#$%&’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklm !”#$%&’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmn “#$%&’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmno #$%&’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnop $%&’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopq %&’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqr &’()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrs ‘()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrst ()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstu )*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuv *+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvw +,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwx ,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxy -./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz ./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{ /0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{| 0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{|} 123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{|}~ 23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{|}~• 3456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{|}~•Ç 456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_‘abcdefghijklmnopqrstuvwxyz{|}~•Çü PRESS [ENTER] KEY Pressing Enter toggles between tests. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break.
Page 70 PRESS [Enter] KEY Subtest 06 640x200 Character Display (mode 6, E) This subtest displays even dots, odd dots, and all dots in the 640x200 dot graphics 640*400 GRAPHICS DISPLAY : [XX] mode 6 and E as shown below: EVEN DOTS ODD DOTS ALL DOTS DRIVEN...
Page 71 Pressing Enter changes the size of the displayed image. To exit this subtest and return to the DISPLAY TEST menu, press Ctrl + Break. Subtest 08 Display Page This subtest confirms that the pages can be changed in order from Pages 0 through 7 in 40*25 character mode.
Page 72 DISPLAY TEST menu, press Ctrl + Break. Subtest 10 LCD/DAC Pallet This subtest checks the icon of sub LCD (Arrow, Caps Lock, Scroll Lock and Num Lock) by key operation. [ Caps/Arrow/Num/Scroll LED test ] (1) Press [ Caps Lock ] key !...Caps (on/off) (2) Press [ Fn + F10...
Page 73: Floppy Disk Test
Floppy Disk Test CAUTION: Before running the floppy disk test, prepare a formatted work disk. Remove the Diagnostics Diskette and insert the work disk into the FDD. The contents of the floppy disk will be erased. To execute the Floppy Disk Test, select 5 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen.
Page 74 digits indicate the error status code as explained in Table 3-3 in Section 3.14. Subtest 01 Sequential Read This subtest performs a Cyclic Redundancy Check (CRC), that continuously reads all the tracks on a floppy disk. The following tracks are read according to the media type in the floppy disk drive: Double-sided, double-density (2D): Tracks 0 to 39.
Page 75: Printer Test
This subtest reads data from a specified track, head, and address. Printer Test To execute the Printer Test, select 6 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions displayed on the screen. The Printer Test contains three subtests that test the output of the printer connected to the computer.
Page 76 Subtest 02 Function This subtest is for IBM-compatible printers, and tests the following functions: Normal print Double-width print Compressed print Emphasized print Double-strike print All characters print PRINTER TEST THIS LINES SHOWS NORMAL PRINT. The subtests print the various print types shown below: THIS LINE SHOWS DOUBLE WIDTH PRINT.
Page 77: Async Test
Subtest 02 Board (#1) <=> Board (#2) (T4500/T4500C only) NOTE: To execute this subtest, an RS-232-C cable (9-pin to 9-pin) must be connected to Boards 1 and 2. The wiring diagram for the RS-232-C direct cable wiring diagram can be found in Appendix G.
Page 78 This subtest checks the data send/receive function through the RS-232-C direct cable. Subtest 03 Point to Point (Send) NOTE: To execute this subtest, two machines must be connected with an RS-232-C direct cable. One machine should be set as “send” (Subtest 03) and the other set as “receive” (Subtest 04).
Page 79: Hard Disk Test
Before running the test, transfer the contents of the hard disk to a backup system. After the hard disk test is completed, execute the Toshiba MS-DOS FDISK command, which will set the partition. Then execute the Toshiba MS-DOS FORMAT command. Refer to the Toshiba MS-DOS manual for details on all DOS commands.
Page 80: Table Of Contents
detected. Select 1 or 2 and press Enter. The following message will appear: Detail status display (1:no,2:yes) ? 5. This message is used to select whether or not the HDD status is displayed on the screen. The HDD status is described in Section 3.15. Select 1 or 2 and press Enter. 6.
Page 81: Subtest 04
Subtest 04 Cross Talk & Peak Shift This subtest writes eight types of worst pattern data (shown below) to a cylinder, then reads the data while moving from cylinder to cylinder. Worst pattern data: B5ADADh, 4A5252h, EB6DB6h, 149249h, 63B63Bh, 9C49C4h, 2DB6DBh, D24924h.
Page 82: Real Timer Test
This subtest writes specified 2-byte data to all of the cylinders on the HDD. Subtest 10 W-R-C Specified Address This subtest writes data to a specified cylinder and head on the HDD, then reads the data and compares it to the original data. 3.12 Real Timer Test To execute the Real Timer Test, select 9 from the DIAGNOSTIC TEST MENU, press Enter and follow the directions on the screen.
Page 83 Writes 1-bit of “off” data to address FEh through 7Fh Writes the data pattern AAh through 55h to the RTC 50-byte memory (address 0Eh to 3Fh) Then the subtest reads and compares this data with the original data. To exit, press Ctrl + Break. Subtest 03 Real Time Carry CAUTION: When this subtest is executed, the current date and time are erased.
Page 84 Current date : 12-31-1988 Current time : 23:59:58 PRESS [Enter] KEY TO EXIT TEST Press Ctrl + Break to exit. 3.13 Co-Processor Test NOTE: Only the T4600 series has a built-in co-processor; therefore only the T4600 Series can execute the co-processor test. Subtest 01 Co-Processor Test This test checks the following functions of the co-processor:...
Page 85: Error Code And Error Status Names
Control word Status word Addition Multiplication To exit, press Ctrl + Break. 3.14 Error Code and Error Status Names Table 3-3 lists the error codes and error status names for the Diagnostic Tests. Table 3-3 Error Codes and Error Status Names (1 of 2) Device name Error code Error status name...
Page 86 Write Buffer Error PRINTER Time Out Fault Select Line Out Of Paper Power Off Busy Line Table 3-3 Error Codes and Error Status Names (2 of 2) Device name Error code Error status name ASYNC DSR On Time Out CTS On Time Out RX-READY Time Out TX-BUFFER Full Time Out Parity Error...
Page 87: Hard Disk Test Detail Status
Write Fault Status Error No CO-PROCESSOR (T4600/T4600C Control Word Error only) Status Word Error Bus Error Addition Error Multiplication Error 3.15 Hard Disk Test Detail Status When an error occurs in the hard disk test, the following message is displayed: HDC status = XXXXXXXX Detailed information about the hard disk test error is displayed on the screen by an eight-digit number.
Page 88 (Data request) “1” ---Drive is ready for data transfer. CORR “0” ---Other (Corrected data) “1” ---Correctable data error is corrected. “0” ---Other (Index) “1” ---Index is sensed. “0” ---Other (Error) “1” ---The previous command was terminated with some error. Table 3-5 Error Register Contents Bit Name Description BBK1...
Page 89: Hard Disk Format
CAUTION: The contents of the hard disk will be erased when this program is executed. Before executing the function, transfer the contents of the hard disk onto a backup system. This can be done with the Toshiba MS-DOS BACKUP command. See the Toshiba MS-DOS manual for details about using the BACKUP command.
Page 90 CAUTION: The contents of the hard disk will be erased when this program is executed. Before executing the function, transfer the contents of the hard disk onto a backup system. This can be done with the Toshiba MS-DOS BACKUP command. See the Toshiba MS-DOS manual for details about using the BACKUP command.
Page 91 [All track FORMAT] Drive #1 = HDD #2 = Non Cylinder XXXX Head Sector <<< Model name = >>> The following selections appear at the bottom of the screen in succession: Drive number select (1:#1,2:#2) ? Select a drive number and press Enter. The following message will appear: Interleave number (1/1 ~ 8) ? Select an interleave number, 1 ~ 8 and press Enter.
Page 92 All Track Format All tracks are formatted as good tracks except those registered as bad tracks (described above) or those identified as bad tracks in track verification described below. Track Verification A check is made of all tracks and if an ECC error, ECC-correctable-data error or record- not-found error is detected at a track, that track is formatted as a bad track automatical- 2.
Page 93: Function Description
[[cylinder, head = 0123 03]] Press Enter to return to the Hard Disk Format menu. CAUTION: After the HDD has been formatted, execute the Toshiba MS-DOS FDISK com- mand, to partition the HDD. Next, execute the Toshiba MS-DOS FORMAT command. Refer to the Toshiba MS-DOS manual for more information about using these commands.
Page 94: Pass Count
2. Remove the Diagnostics Disk from the FDD, then insert the cleaning disk and press Enter. 3. When the cleaning start message appears, the FDD head cleaning has begun. 4. The display automatically returns to the DIAGNOSTIC MENU when the program is completed.
Page 95: Error Count
Address Error status Pass count HDC status Subtest number Read data Test name Write data Error count Error status name [1:Next,2:Prev,3:Exit,4:Clear,5:Print,6:FD Log Read,7:FD Log Write]] 2. The error information displayed on the screen can be manipulated by the following number keys: The 1 key scrolls the display to the next page.
Page 96: Running Test
The 3 key returns to the Diagnostic Menu. The 4 key erases all error log information in RAM. The 5 key outputs the error log information to a printer. The 6 key reads the log information from a floppy disk. The 7 key writes the log information to a floppy disk.
Page 97 2. Select 6 from the Diagnostic Menu and press Enter, the following message will be displayed: Printer wraparound test (Y/N) ? Selecting Y (yes) executes the printer wraparound test. A printer wraparound connector must be connected to the printer port on the back of the computer to properly execute this test.
Page 98: Floppy Disk Drive Utilities
This function formats the FDD, copies the floppy disk and displays the dump list for both the FDD and HDD. Note that the T4600/T4600C does not support an external FDD. Therefore, all referenc- es to an external FDD (3.5-inch or 5.25-inch) relate to the T4500/T4500C Computer. FORMAT NOTE: This program is only for testing a floppy disk drive.
Page 99 3.20.2 Operations Selecting 7 from the DIAGNOSTIC MENU and pressing Enter, displays the following message: [ FDD UTILITIES ] 1 - FORMAT 2 - COPY 3 - DUMP 9 - EXIT TO DIAGNOSTICS MENU FORMAT Program 1. Selecting FORMAT displays the following message: DIAGNOSTICS - FLOPPY DISK FORMAT : VX.XX Drive number select (1:A, 2:B) ? 2.
Page 100 COPY Program 1. When COPY is selected, the following message appears: FLOPPY DISK FORMAT & COPY : VX.XX Type select (0:2DD-2DD,1:2D-2D,2:2D-2HD,3:2HD-2HD) ? 2. Selecting a media/drive type number will display a message similar to the one below: Insert source disk into drive A: Press any key when ready.
Page 101 Select FDD number (1:A, 2:B) ? 3. Select a drive number to display the following message: Format type select (0:2DD, 1:2D, 2:2HD) ? 4. Select a media type number and the following message will appear: Insert source disk into drive A: Press any key when ready.
Page 102: System Configuration
3.21 System Configuration 3.21.1 Function Description The System Configuration program contains the following configuration information for the T4500/T4600 Family computer. BIOS ROM version Boot ROM version KBC version Base memory size The number of floppy disk drives...
Page 103 Extended Memory Hard RAM Shadow BIOS ROM 2. Display Display Adapter LCD Display Mode Display Color (T4500C only) LCD Gray Scale Level (T4500 only) 3. Battery Battery Save Mode Battery Display Manual Setting of Battery Level 4. Hard Disk 5. COM/PCMCIA/FDD/PRT...
Page 104 Printer Port Type 6. Others Resume Mode CPU Cache Speaker Volume Panel Power On/Off Hotkeys External Keyboard “Fn” Key Equivalent The setup displays theT4600/T4600C’s current system setup information as listed below: 1. Memory Total Base Extended Memory Hard RAM Shadow BIOS ROM 2.
Page 105: Accessing The Setup Program
If you would like to use an external 5.25-inch floppy disk drive attached to the parallel port (T4500 or T4500C only), the “External FDD/PRT” option must be configured as either “FDD A” or “FDD B.”...
Page 106 Press ESC if the setup options displayed accurately reflect your hardware configuration and no changes are necessary. The SETUP displays the following message: Exit without saving? (Y/N) Press Y. The system returns to the DIAGNOSTIC MENU. 3.22.3 Changing SETUP Values You can change the setup options automatically or manually.
Page 107 Space bar or Bk Sp key, the size of memory allocated for Hard RAM increases or decreases in 64 KB increments from 128 KB to 11520 KB (T4500/T4500C) or 128 KB to 16768 KB (T4600/T4600C). The default is 0 KB.
Page 108 180K colors, 24K colors, and 512K colors on the T4500C or T4600C. It does not appear on the T4500 or T4600. Refer to “Hot keys” under the OTHERS section later in this chapter for more information on hot key operation.
Page 109 Long life or User’s setting in the SETUP window. The default is Full Power Economy Power Long life when the T4500/T4600 Family uses battery power. BATTERY SAVE OPTIONS BATTERY SAVE OPTIONS Processing Speed...
Page 110 This option is used to disable or set the duration of the display automatic power off function. This function turns off the computer sidelight if you make no entry for the set period of time. Always OFF can be used only on the T4500 or T4600. Disables display automatic power off.
Page 111 4. Hard Disk This option enables or disables the hard disk drive. The T4500 Series can use an 80 or 120 MB HDD while the xxMB T4600 Series can use a 120, 200 or 320 MB HDD. The disk’s capacity is automatically displayed but cannot be changed, except to No drive.
Page 112 This option allows you to use a PCMCIA or other optional card. If you select “Others,” you can set the next window, COM Port and Power. The T4500 Series only has one PCMCIA card slot displayed on the SETUP screen as “PCMCIA Slot.” The two PCMCIA slots on the T4600 Series appear as “PC Card Slot 1”...
Page 113 This option sets the communication mode for the PRT/FDD port to either output-only or bi- directional. For the T4500 Series, it is effective only when the External PRT/FDD option is set to “Printer.” If either FDD A or FDD B is selected, this setting is ignored and the mode is automatically set to bi-directional.
Page 114 NOTE: Resume mode works only with Toshiba’s versions of MS-DOS, Windows 3.x and Toshiba MS OS/2. For more information on Resume and the installation of the proper resume drivers, refer to “Resume Mode Restrictions” in chapter 2 of the T4500 Series or T4600 Series Reference Manual.
Page 115 Disables the hotkeys. Disable NOTE: The following hotkeys are enabled only in Toshiba MS-DOS or Windows 3.x operat- ing system/environment. If the computer is running in a system or environment other than these, set this option to “Disable.” The other hotkeys, however, will work in any operating system/environment.
Page 116: Before You Begin
11. Display Mask Before You Begin Look over the procedures in this section before you begin disassembling the T4500/T4600 Family computer. Familiarize yourself with the disassembly and reassembly steps. Begin each procedure by removing the AC adapter and the battery pack as instructed in Section 4.2, Battery Pack.
Page 117: Disassembly Procedures
NOTE: The illustrations in this chapter are based on the appearance of the T4500C except where otherwise noted. Disassembly Procedures The T4500/T4600 Family computer has two basic types of cable connectors: Pressure Plate Connectors Normal Pin Connectors To disconnect a Pressure Plate connector, pull the pressure plate’s side tabs straight out (toward the cable) and slide the cable out of the connector.
Page 118: Assembly Procedures
Assembly Procedures After you have disassembled the T4500/T4600 Family and repaired the problem that was causing the computer to operate abnormally, you will need to reassemble the computer. While assembling, remember the following general points: Take your time, making sure you follow the instructions closely. Most problems arise when you get in a hurry assembling the computer.
Page 119: Battery Pack
Battery Pack Removing the Battery Pack To remove the T4500/T4600 Family computer’s battery pack, follow the steps below and refer to Figure 4-1. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 120 Optional Memory Card Removing the Optional Memory Card To remove an optional memory card from the T4500/T4600 Family computer, follow the steps below and refer to Figures 4-2 and 4-3. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 121 Installing the Optional Memory Card To install an optional memory card in the T4500/T4600 Family computer, follow the steps below and refer to Figures 4-4 and 4-2. 1. The top of the optional memory card is marked with the word “insert” and an arrow pointing toward the connecting edge.
Page 122 Optional PCMCIA Card(s) Removing the Optional PCMCIA Card(s) & Disassembling the Slot To remove an optional PCMCIA card from the T4500/T4600 Family computer or to disassemble the slot, follow the steps below and refer to Figures 4-5 through 4-7: 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 123 Figure 4-6 Removing the PCMCIA Card from Slot 2 6. Remove the two M2.5x4 silver screws on the slot’s inner plastic cover. Grasp the bottom of the inner plastic cover and pull it in the arrow’s direction to remove (Figure 4-7). 7.
Page 124: Top Cover
Top Cover Removing the Top Cover and Backup Battery To remove the T4500/T4600 Family computer’s top cover, follow the steps below and refer to Figures 4-8 and 4-9. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 125 7. With the display closed, turn the computer over and remove the one M2x3 black screw at the front of the battery slot (Figure 4-9). 8. Turn the computer back over and open the display. Lay the display back fully. (Put a book or small box behind the display to support it.) 9.
Page 126: Installing The Top Cover
Installing the Top Cover To install the computer’s top cover, follow the steps below and refer to Figures 4-8 and 4-9. 1. Place the top cover on the computer making sure the status indicator panel is aligned with the window on the top cover. CAUTION: Be careful not to pinch the LCD display cables when installing the top cover.
Page 127: Removing The Keyboard
Keyboard Removing the Keyboard To remove the T4500/T4600 Family computer’s keyboard, follow the steps below and refer to Figure 4-10. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 128: Installing The Keyboard
Installing the Keyboard To install the computer’s keyboard, follow the steps below and refer to Figures 4-10 and 4-11. 1. Connect the keyboard cable to the pressure-plate connector on the system board (Figure 4-10). 2. Seat the keyboard in the computer. Note that a fold is built into the keyboard cable. Do not try to bend the cable at any other point when you install the keyboard (Figure 4-9).
Page 129 Status Indicator Panel (Sub LCD) Removing the Status Indicator Panel To remove the T4500/T4600 Family computer’s status indicator panel, follow the steps below and refer to Figure 4-12. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 130 Figure 4-12 Removing the Status Indicator Panel Installing the Status Indicator Panel To install the computer’s status indicator panel, follow the steps below and refer to Figure 4-13. 1. Connect the status indicator panel cable to PJ11 on the computer and lay the panel into a recession in the protective metal plate.
Page 131 Hard Disk Drive • Speaker/Ball-Point Mouse Connector Removing the Hard Disk Drive • Speaker/Ball-Point Mouse Connector To remove the T4500/T4600 Family’s hard disk drive and the flexible cable connecting the speak- er/ball-point mouse connector, follow the steps below and refer to Figures 4-14 through 4-16.
Page 132 NOTE: Use extreme caution when handling the ball-point mouse connector and the speaker as these parts are very delicate and can be damaged easily. 5. Remove the one M2.5x6 screw securing the ball-point mouse connector (Figure 4-15). 6. Lift out the ball-point mouse connector. 7.
Page 133: Installing The Hard Disk Drive
10. Lift out the HDD with the ball-point mouse connector and speaker attached. 11. Place your fingers behind the plastic plate on the HDD connector and pull to disconnect the flexible cable from the HDD. 12. Remove four flat-head M2x4 screws securing the bracket to the HDD and slip off the bracket (Figure 4-16).
Page 134 CAUTION: If you replace the flexible cable with a new one, be sure to fold it and wrap tape around the cable as indicated in Figure 4-17 so that it lies flat and will not be pinched by the top cover or other component. Figure 4-17 Connecting the Flexible Cable to the HDD 3.
Page 135: Display Assembly
Display Assembly Removing the Display Assembly To remove the T4500/T4600 Family computer’s display assembly, follow the steps below and refer to Figure 4-18. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 136: Installing The Display Assembly
Installing the Display Assembly To install the computer’s display, follow the steps below and refer to Figures 4-18 through 4-20. 1. Place the display assembly on the computer making sure the brackets on the display fit in front of the corresponding brackets on the computer. 2.
Page 137 6. Connect the display disable switch cable to its connector (PJ10) on the system board and secure it in place with tape (Figure 4-20). Figure 4-20 Connecting the Display Disable Switch Cable 7. Install the top cover, optional PCMCIA card, optional memory card, and battery pack as described in Sections 4.5 through 4.2.
Page 138: Removing The System Board
4.10 System PCB Removing the System Board To remove the T4500/T4600 Family computer’s system board, follow the steps below and refer to Figures 4-21 and 4-22. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 139: Installing The System Board
Installing the System Board To install the computer’s system board, follow the steps below and refer to Figure 4-21. 1. Seat the system PCB in the computer’s case. 2. Replace the hinge covers, two M2.5x6 silver screws from the bottom cover, and one M2.5x6 silver screw securing the system PCB.
Page 140: Floppy Disk Drive
4.11 Floppy Disk Drive Removing the Floppy Disk Drive To remove the T4500/T4600 Family computer’s floppy disk drive, follow the steps below and refer to Figures 4-23 and 4-24. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 141: Installing The Floppy Disk Drive
Figure 4-24 Removing the FDD Bracket Installing the Floppy Disk Drive To install the T4500/T4600 Family computer’s floppy disk drive, follow the steps below and refer to Figures 4-23 and 4-24. 1. Place the FDD bracket on the FDD and secure it with the two M2x3 black screws (Figure 4-24).
Page 142 4.12 Backup Battery & RTC Battery Removing the Backup Battery & RTC Battery To remove the T4500/T4600 Family computer’s backup battery and RTC battery, follow the steps below and refer to Figure 4-25. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 143 Installing the Backup Battery & RTC Battery To install the computer’s backup battery and RTC battery, follow the steps below and refer to Figures 4-26 and 4-27. 1. Connect the backup battery cable to its connector. Seat the backup battery so that the cable end faces away from the connector.
Page 144: Display Mask
4.13 Display Mask Removing the Display Mask To remove the T4500/T4600 Family computer’s display mask, follow the steps below and refer to Figure 4-28. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 145: Installing The Display Mask
4. Do a quick check to be sure the mask is seated securely around the display. 5. Secure the cover with two M2.5x4 screws (T4500/T4600) or two M2.5x6 screws (T4500C/ T4600C) at the top corners.
Page 146 4.14 T4500C FL Inverter Board Removing the T4500C FL Inverter Board To remove the T4500C’s FL inverter board, follow the steps below and refer to Figure 4-29. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 147 Installing the T4500C FL Inverter Board To install the T4500C’s FL inverter board, follow the steps below and refer to Figures 4-29 and 4-30. 1. Connect the FL inverter cable to CN1 on the inverter board and the four FL cables to CN2, CN3, CN4 and CN5 (Figure 4-29).
Page 148 4.15 T4500C 8.4-inch TFT Color LCD Module Removing the T4500C 8.4-inch TFT Color LCD Module To remove the T4500C’s LCD module, follow the steps below and refer to Figures 4-31 and 4-32. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 149 5. Carefully rotate the LCD module from right to left out of the display cover and disconnect the two display cables from CN1 and CN2 on the module (Figure 4-32). Figure 4-32 Disconnecting the Display Cables Installing the T4500C 8.4-inch TFT Color LCD module To install the T4500C’s 8.4-inch TFT color LCD display, follow the steps below and refer to Figures 4-31 and 4-33: 1.
Page 150 3. Align the 8.4-inch TFT color LCD display and then secure it with four M2.5x6 screws (Figure 4-31). 4. Install the FL inverter board, display mask, display assembly, top cover, optional PCMCIA card, optional memory card and battery pack as described in Sections 4.14, 4.13, 4.9, 4.5, 4.4, 4.3, 4.2.
Page 151 4.16 T4500C Fluorescent Lamp Unit CAUTION: When you remove the FL unit, be careful not to let any dust or other foreign matter enter it. Removing the T4500C FL Unit To remove the T4500C’s FL unit, follow the steps below and refer to Figures 4-34 through 4-37. 1.
Page 152 5. Remove the four M2x3 silver screws securing the FL unit LCD panel to the back frame (Figure 4-35). M2x3 silver screws Figure 4-35 Removing the FL Unit Screws 6. Turn over the panel. 7. Use a slender object, such as tweezers, to push through the four holes on the unit and un- snap the latches to free the LCD panel from the back frame (Figure 4-36).
Page 153 8. Gently unsnap the LCD panel at the corners from the FL unit and lift it off the panel (Figure 4-37). CAUTION: Be very careful when you unsnap the display panel. If you use too much force, you might break the panel’s tabs. Figure 4-37 Removing the FL Unit from the Display Panel Installing the T4500C FL Unit To install the T4500C’s FL unit, follow the steps below and refer to Figures 4-34 through 4-37.
Page 154 4.17 T4600C FL Inverter Board Removing the T4600C FL Inverter Board To remove the T4500C’s FL inverter board, follow the steps below and refer to Figure 4-38. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 155 4.18 T4600C 9.5-inch TFT Color LCD Module Removing the T4600C 9.5-inch TFT Color LCD Display To remove the T4600C’s LCD module, follow these steps and refer to Figures 4-39 and 4-40. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 156 5. Disconnect the display cables from CN11 and CN12 on the LCD module (Figure 4-40). Display cables Display cover Figure 4-40 Disconnecting the Display Cables Installing the T4600C 9.5-inch TFT Color LCD To install the T4600C’s 9.5-inch TFT color LCD, follow the steps below and refer to Figures 4-39 and 4-40.
Page 157 4.19 T4600C Fluorescent Lamp Unit Removing the T4600C’s FL Unit CAUTION: When you remove the FL unit, be careful not to let any dust or other foreign matter contaminate the LCD panel. Any contamination can adversely affect the perfor- mance of the unit. To remove the T4600C’s FL unit, follow the steps below and refer to Figure 4-41.
Page 158 Sections 4.2, 4.3, 4.4, 4.5, 4.9, and 4.13. 3. Remove the two M2.5x4 screws securing the FL inverter board. 4. Disconnect the FL inverter cable and FL cable from CN1 and CN2 on the FL inverter board. Figure 4-42 Removing the T4500/T4600 FL Inverter Board 4-43...
Page 159 Installing the Monochrome LCD FL Inverter Board To install the T4500/T4600 FL inverter board, follow the steps below and refer to Figures 4-42 and 4-43. 1. Connect the FL inverter cable and FL cable to CN1 and CN2 on the FL inverter board (Figure 4-42).
Page 160 CAUTION: The T4500/T4600 LCD module is easily damaged. Before removing the mod- ule, refer to Appendix A for precautions on handling. To remove the T4500/T4600 liquid crystal display module, follow the steps below and refer to Figures 4-44 and 4-45: 1.
Page 161 6. Disconnect the two display cables from CN1 and CN2 on the LCD module (Figure 4-45). Figure 4-45 Removing the LCD Module 4-46...
Page 162 Installing the Monochrome Liquid Crystal Display Module To install the T4500/T4600 liquid crystal display module, follow the steps below and refer to Figures 4-44 through 4-46. 1. Connect the two display cables to CN1 and CN2 on the LCD module (Figure 4-45).
Page 163 4.22 T4500/T4600 Fluorescent Lamp Removing the T4500/T4600 Fluorescent Lamp To remove the T4500/T4600 fluorescent lamp, follow the steps below and refer to Figure 4-47: 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 164 Installing the Fluorescent Lamp To install the T4500/T4600 fluorescent lamp, follow the steps below and refer to Figure 4-47. 1. Slip the edge of the plastic cover under the metal frame and align the holes in the cover with the corresponding holes in the display assembly cover.
Page 165 4.3, 4.4, 4.5, 4.9, 4.13; and 4.14 through 4.16 (T4500C); or 4.17 and 4.18 (T4600C); or 4.20 and 4.21 (T4500/T4600). 3. To remove the gray FL inverter signal cable, remove two M2.5x4 screws (T4500/T4600) or two M2.5x6 screws (T4500C/T4600C) securing the bracket holding the cable and lift out the cable (Figure 4-48).
Page 166 4. To remove the pink and black display cables, remove the two M2.5x6 silver screws secur- ing the display hinge (Figure 4-49). 5. Remove the one M2.5x4 screw (T4500/T4600) or one M2.5x6 screw (T4500C/T4600C) securing the ground cable (Figure 4-49).
Page 167 (Figure 4-51). Figure 4-51 Routing the Display Cables 3. Secure the ground cable with one M2.5x4 brass screw (T4500/T4600) or one M2.5x6 screw (T4500C/T4600C) (Figure 4-49). 4. Install the LCD or TFT module, FL inverter, display mask, display assembly, top cover, optional PCMCIA card, optional memory card and battery pack as described in Sections 4.20 and 4.21 (T4500/T4600);...
Page 168: Battery Release Latch
4.24 Battery Release Latch Removing the Battery Release Latch To remove the T4500/T4600 Family computer’s battery release latch, follow the steps below and refer to Figure 4-52. 1. Turn off the power to the computer; disconnect the AC adapter, power cord and all external cables connected to it.
Page 169 4-54...
Page 170 Handling the LCD/TFT Module Precautions for handling the T4500/T4600 Family’s LCD and TFT module The T4500/T4600 Family computer’s monochrome LCD or color TFT module can be easily dam- aged during assembly or disassembly. Observe the following precautions when handling the mod- ule.
Page 171 3. If the panel’s surface gets dirty, wipe it with cotton or a soft cloth. If it is still dirty, try breathing on the surface to create a light condensate and wipe it again. If the surface is very dirty, we recommend a CRT cleaning agent. Apply the agent to a cloth and then wipe the panel’s surface.
Page 172 6. CMOS-LSI circuits are used in the module, so guard against damage from electrostatic discharge. Be sure to wear a wrist or ankle ground when handling the module. 7. Do not expose the module to direct sunlight or strong ultraviolet rays for long periods. 8.
Page 173 9. Do not disassemble the display module. Disassembly can cause malfunctions. 10. If you transport the module, do not use packing material that contains epoxy resin (amine) or silicon glue (alcohol or oxime). These materials can release gas that can damage the panel’s polarization.
Page 174 APPENDIX B System PCB Layout T4500/T4500C System Board Figure B-1 T4500/T4500C System PCB (FSH4S1) - Front...
Page 175 Figure B-2 T4500/T4500C System PCB (FSH4S1) - Back...
Page 176 Table B-1 T4500/T4500C ICs and Connectors on the System PCB - Front Callout Number Description IC 1 Central Processing Unit (CPU) IC 3 to IC 10 System RAM IC 13 Super Integration T9901 IC 22 Real Timer Clock (RTC) IC 29...
Page 177 T4600/T4600C System Board Figure B-3 T4600/T4600C System PCB (FSH1S1) - Front...
Page 178 Figure B-4 T4600/T4600C System PCB (FSH1S1) - Back...
Page 179 Table B-3 T4600/T4600C ICs and Connectors on the System PCB - Front Callout Number Description IC 1 Central Processing Unit (CPU) IC 2 to IC 9 System RAM IC 12 82360SL IC 15 CLK Generator IC 19 Sub LCD Gate Array IC 42 VGA Controller (WD90C26A) IC 50, IC 51...
Page 180: Connector Pin Assignments
APPENDIX C Connector Pin Assignments PJ1 Memory Slot Connector (88-Pin) Table C-1 T4500/T4500C Memory Slot Connector Pin Assignments (88-pin) Signal Signal — — D00;100 D16;100 D01;100 D17;100 D02;100 D18;100 D03;100 D19;100 D04;100 D20;100 D05;100 D21;100 D06;100 D22;100 — D23;100 D07;100 —...
Page 181 Table C-2 T4600/T4600C Memory Slot Connector Pin Assignments (88-pin) Signal Signal — — MD00;100 MD16;100 MD01;100 MD17;100 MD02;100 MD18;100 MD03;100 MD19;100 MD04;100 MD20;100 MD05;100 MD21;100 MD06;100 MD22;100 — MD23;100 MD07;100 — — RAS0;001 — — MA00;111 MA01;111 MA02;111 MA03;111 — MA05;111 MA04;111 MA07;111...
Page 182 PJ2 RTC Connector (3-Pin) Table C-3 RTC Connector Pin Assignments (3-pin) Signal Signal — — — PJ4 FDD (Int) Connector (26-Pin) Table C-4 FDD (Int) Connector Pin Assignments (26-pin) Signal Signal ISSEL;000 — — IDIRC;000 IRDAT;000 ILOWD;000 — IMON;000 IWPR;000 IHMED;000 —...
Page 183 SD11;102 — — DRVSL;000 SD02;102 BATR;100 — — BATG;100 — SD12;102 SPOUT1;100 — — SPOUT0;100 — PJ6 (T4500/T4500C), PJ43 (T4600/T4600C) FL Inverter Connector (6-Pin) Table C-6 FL Inverter Connector Pin Assignments (6-pin) Signal Signal DSPV — DSPV BRTCNT — —...
Page 184 Signal SUBBAT — — PJ8 PS I/F Connector (50-Pin) Table C-8 PS IF Connector Pin Assignments (50-pin) Signal Signal PSRST;000 PSUPDT;100 PSAD0;100 — ADPCNT;100 SUSSTA;001 (T4500/T4500C) PSSTA;000 (T4600/T4600C) PSAD1;100 — CPCNF;100 PSREQ;000 PSAD2;100 — BEEP;000 BATG;100 — PSAD3;100 — PCLR;000 BATR;100...
Page 185 PJ10 Display Sensor Switch Connector (2-Pin) Table C-9 Display Sensor Switch Connector Pin Assignments (2-pin) Signal Signal PNLOFF;000 — PJ11 Status Indicator Panel Connector (16-Pin) Table C-10 Status Indicator Panel I/F Pin Assignments (16-pin) Signal Signal LCOM4;100 LSEG08;000 LCOM3;100 LSEG07;000 LCOM2;100 LSEG06;000 LCOM1;100...
Page 186 C.11 PJ13 (T4500/T4500C), PJ45 (T4600/T4600C) LCD Connector (13-Pin) Table C-12 LCD Connector Pin Assignments (13-pin) Signal Signal LCDVCC — LD2;102 LCDVCC — — BO;102 — — FR;102 — UD0;102 UD1;102 — UD2;102 C.12 PJ17 (T4500/T4500C), PJ44 (T4600/T4600C) LCD Connector (15-Pin)
Page 187 C.13 PJ14 Back Panel Connector (40-Pin) Table C-14 Back Panel Connector Pin Assignments (40-pin) Signal Signal — — STROB;000 ACK;000 — DCD1;100 PDB04;100 PINT;000 MOUSEDT;100 SD1;000 PDB03;100 BUSY;100 MOUSECK;100 RD1;000 PDB07;100 SLIN;000 EKBDAT;100 RI1;100 PDB02;100 PE;100 EKBCLK;100 RTS1;100 PDB06;100 ERROR;000 —...
Page 188 C.14 PJ15 Expansion Connector (150-Pin) Table C-15 T4500/T4500C Expansion Connector Pin Assignments (150-pin) (1 of 2) Signal Signal DCIN SA11;101 DCIN SA12;101 DCIN SA13;101 DCIN SA14;101 SA15;101 — SA16;101 SA17;101 ADPCNT;100 SA18;101 — SA19;101 RVCC — SD00;101 RGND — SD01;101 CPCNF;100...
Page 189 Table C-15 T4500/T4500C Expansion Connector Pin Assignments (150-pin) (2 of 2) Signal Signal — IRQ4;101 IOCLK;110 MEWR;001 IRQ5;101 IRQ7;101 DRQ3;101 — DACK3;001 RED;101 AEN;101 LGREN;101 DRQ1;101 BLUE;101 IOCRDY;101 — — PHSYNC;100 IRQ10;101 PVSYNC;100 IRQ14;101 — SD08;101 EKBDAT;100 SD09;101 EKBCLK;100 IRQ11;101 —...
Page 190 Table C-16 T4600/T4600C Expansion Connector Pin Assignments (150-pin) (1 of 2) Signal Signal DCIN SA11;101 DCIN SA12;101 DCIN SA13;101 DCIN SA14;101 SA15;101 — SA16;101 SA17;101 ADPCNT;100 SA18;101 — SA19;101 RVCC — SD00;101 RGND — SD01;101 CPCNF;100 SD02;101 MDMSL;001 SD03;101 COMCCK;101 —...
Page 191 Table C-16 T4600/T4600C Expansion Connector Pin Assignments (150-pin) (2 of 2) Signal Signal — IRQ4;101 IOCLK;100 MEWR;001 IRQ5;101 IRQ7;101 DRQ3;101 — DACK3;001 RED;101 AEN;101 LGREN;101 DRQ1;101 BLUE;101 EIORDY;101 — — PHSYNC;100 IRQ10;101 PVSYNC;100 IRQ14;101 — SD08;101 EKBDAT;100 SD09;101 EKBCLK;100 IRQ11;101 —...
Page 192 C.15 PJ16 PC Card Slot 1 Connector (68-Pin) Table C-17 PC Card Slot 1 Connector Pin Assignments (68-pin) Signal Signal — — CDA03;100 CD1A;000 CDA04;100 CDA11;100 CDA05;100 CDA12;100 CDA06;100 CDA13;100 CDA07;100 CDA14;100 CE1A;000 CDA15;100 CADA10;100 CE2A;000 OEA;000 — CADA11;100 IORA;000 CADA09;100 IOWA;000 CADA08;100...
Page 193 C.16 PJ20 PC Card Slot 2 Connector (68-Pin) (T4600/T4600C only) Table C-18 PC Card Slot 2 Connector Pin Assignments (68-pin) Signal Signal — — CDB03;100 CD1B;000 CDB04;100 CDB11;100 CDB05;100 CDB12;100 CDB06;100 CDB13;100 CDB07;100 CDB14;100 CE1B;000 CDB15;100 CADB10;100 CE2B;000 OEB;000 — CADB11;100 IORB;000 CADB09;100...
Page 194 C.17 PJ18 CRT I/F Connector (15-Pin) Table C-19 CRT I/F Connector Pin Assignments (15-pin) Signal Signal RED;101 — LGREN;101 — BLUE;101 — — — — PHSYNC;100 — PVSYNC;100 — — — C.18 PJ3 (FSHBP1) PS/2 Mouse Connector (6-Pin) Table C-20 PS/2 Mouse Connector Pin Assignments (6-pin) Signal Signal MOUSDT;101...
Page 195 PDB06 — PDB07 — — BUSY — — SELCT C.22 PJ1 PRT/FDD Connector - for External FDD (25-Pin) (T4500/T4500C only) Table C-24 PRT/FDD Connector Pin Assignments (for External FDD) (25-pin) Signal Signal LOWD INDX SSEL DIRC STEP RDAT — DKCH —...
Page 196 APPENDIX D ASCII Character Codes Table D-1 ASCII Character Codes...
Page 197 APPENDIX E Keyboard Scan / Character Codes Table E-1 Scan Codes - Set 1 and Set 2 (1 of 3) Code Set 1 Code Set 2 Keytop Note* Make Break Make Break ‘ ~ F0 0E F0 16 F0 1E F0 26 F0 25 F0 2E...
Page 198 Table E-1 Scan Codes - Set 1 and Set 2 (2 of 3) Code Set 1 Code Set 2 Keytop Note* Make Break Make Break ‘ " F0 52 Enter F0 5A Shift (L) F0 12 No.102 Key F0 61 F0 1A F0 22 F0 21...
Page 199 Table E-1 Scan Codes - Set 1 and Set 2 (3 of 3) Code Set 1 Code Set 2 Keytop Note* Make Break Make Break F0 05 F0 06 F0 04 F0 0C F0 03 F0 0B F0 83 F0 0A F0 01 F0 09 F0 78...
Page 200 Table E-2 Scan Codes with the Left Shift Key Code Set 1 Code Set 2 Keytop Make Break Make Break E0 AA E0 52 E0 D2 E0 2A E0 F0 12 E0 70 E0 F0 70 E0 12 E0 AA E0 53 E0 D3 E0 2A E0 F0 12 E0 71 E0 F0 71 E0 12...
Page 201 Table E-4 Scan Codes with the Fn Key Code Set 1 Code Set 2 Keytop Make Break Make Break E0 1C E0 9C E0 5A E0 F0 5A CTRL E0 1D E0 9D E0 14 E0 F0 14 LALT E0 38 E0 B8 E0 11 E0 F0 11...
Page 202 The arrow key markings for the T4500/T4600 monochrome computers and the T4500C/T4600C color computers are different. The monochrome T4500/T4600 keyboard has contrast icons on the left and right arrow keys. The color T4500C/T4600C does not have a contrast control. Also, the F6 key has a video mode icon and is used to display normal or reverse video on the monochrome T4500/T4600 computers.
Page 203 German (GR) Keyboard Figure F-3 German Keyboard French (FR) Keyboard Figure F-4 French Keyboard...
Page 204 Spanish (SP) Keyboard Figure F-5 Spanish Keyboard Italian (IT) Keyboard Figure F-6 Italian Keyboard...
Page 205 Scandinavian (SC) Keyboard Figure F-7 Scandinavian Keyboard Swiss-German (SL) Keyboard Figure F-8 Swiss-German Keyboard...
Page 206 Canadian (Specialized) Keyboard Figure F-9 Canadian Keyboard F.10 Keycap Number Keyboard Figure F-10 Keycap Number Keyboard...
Page 207: Wiring Diagrams
APPENDIX G Wiring Diagrams Printer Wraparound Connector +PD7 (15) –ERROR +PD6 (14) –AUTFD +PD5 (13) +SELECT +PD4 (16) –PINIT +PD3 –STROBE (10) –ACK +PD2 (12) +PE +PD1 (17) –SLIN +PD0 (11) +BUSY Figure G-1 Printer Wraparound Connecter RS-232-C Wraparound Connector Figure G-2 RS-232-C Wraparound Connecter RS-232-C Direct Cable (9-Pin to 9-Pin) Figure G-3 RS-232-C Direct Cable (9-pin to 9-pin)
Page 208 RS-232-C Direct Cable (9-Pin to 25-Pin) (22) RI (20) DTR Figure G-4 RS-232-C Direct Cable (9-pin to 25-pin)
Page 209: Deleting The Password
For security reasons, the Password Deletion Disk will not be distributed to Service Providers. You must obtain the current password from the computer's owner to service the machine. If the owner forgets the password, contact your Toshiba representative for further action.
Page 210: Bios Rewrite Procedures
T4500/T4600 Family computer. Tools To rewrite the BIOS, the following tool is required: BIOS rewrite disk for T4500/T4500C or T4600/T4600C (May also be found on Toshiba’s BBS) Rewriting the BIOS Follow the procedures below to start the BIOS rewrite program.
Page 211 APPENDIX J Acronyms This is a list of some of the acronyms used in this manual. CRONYM EFINITION BIOS ....Basic Input/Output System BPQP ....Ball-point Quick Port CPU ....Central Processing Unit DMA ....Direct Memory Access DMAC ....Direct Memory Access Controller FDC ....
Page 212 APPENDIX K T4500/T4600 Family Computer - Exploded View LCD Module Display cover Display mask FL inverter System PCB (with Power supply) Floppy disk drive Bottom cover Hard disk drive Battery pack Keyboard NOTE: This diagram is for reference only. Please see Chapter 4, Replacement Procedures...

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