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Toshiba T6400 Maintenance Manual
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Toshiba T6400 Maintenance Manual

Toshiba T6400 Maintenance Manual

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Chapter 1
Hardware Overview
1-1

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Summary of Contents for Toshiba T6400

  • Page 1 Chapter 1 Hardware Overview...
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  • Page 3: Table Of Contents

    Color LCD specifications ..................1-14 Table 1-6 Power supply unit output ratings ................1-15 Figures Figure 1-1 T6400 system unit ..................... 1-7 Figure 1-2 Block diagram ......................1-8 Figure 1-3 3.5-inch FDD ......................1-10 Figure 1-4 3.5-inch HDD ......................1-11 Figure 1-5 Keyboard.........................
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  • Page 5: General

    T6400 offers excellent display legibility and IBM PC/AT compatibility. There are four models of the T6400 depending on the CPU, display type, and HDD capacity. Refer to Table 1-1 below. Table 1-1 T6400 models...
  • Page 6 Keyboard port The T6400 has an external PS/2 keyboard interface port on the right side. Mouse port The T6400 has one 6-pin mouse port on the back that can be used for connecting a PS/2 mouse. RGB port The T6400 has one 15-pin RGB port on the back that can be used for connecting an external video display.

  • Page 7: Figure 1-1 T6400 System Unit

    The 150-pin expansion bus connector port allows you to connect unique optional Toshiba devices. Memory slots The T6400 has two expansion memory slots for installing the optional 2, 4, and/or 8 MByte memory cards. The T6400 Personal Computer is shown in Figure 1-1.

  • Page 8: System Unit Block Diagram

    System Unit Block Diagram Figure 1-2 is a block diagram of the T6400 system unit. Figure 1-2 Block diagram...
  • Page 9 The T6400 system board shown in Figure 1-2 is composed of the following major components: An 80486DX-33 or 80486SX-25 CPU Super Integration (SI) T9901 (208-pin), which stores the following components: Two Direct Memory Access Controllers (DMACs): 82C37 Two Programmable Interrupt Controllers (PICs):...

  • Page 10: Inch Floppy Disk Drive

    The T6400 3.5-inch Floppy Disk Drive (FDD) is a thin, high-performance, reliable drive that supports 720KB (formatted) 2DD and 1.44MB (formatted) 2HD 3.5-inch floppy disks. The T6400 FDD is shown in Figure 1-3 and its specifications are described in Table 1-2. Figure 1-3 3.5-inch FDD...

  • Page 11: Inch Hard Disk Drive

    The T6400 120MB or 200MB (formatted) Hard Disk Drive (HDD) is a random access, non-volatile storage device. It has a non-removable 3.5-inch magnetic disk and mini-Winchester type magnetic heads. The T6400 HDD is shown in Figure 1-4. Specifications for the HDD are described in Table 1-3. Figure 1-4 3.5-inch HDD Item...

  • Page 12: Keyboard

    Table 1-3 3.5-inch HDD specifications Keyboard The 101-key (USA) or 102-key (European) keyboard is mounted on the T6400’s system unit. The keyboard is connected to the keyboard controller in the keyboard unit. The keyboard is shown in Figure 1-5. See Appendix E for optional keyboard configurations.

  • Page 13: Gas Plasma Display

    Gas Plasma Display The gas plasma display is composed of a display panel and driver circuits. It receives vertical and horizontal synchronizing signals, four-bit data signals, and shift clock for data transmission. All signals are TTL-level compatible. The display has 16 levels of gray scale and the display quality can be adjusted with the contrast control.

  • Page 14: Color Liquid Crystal Display

    Table 1-4 Gas plasma display specifications Color Liquid Crystal Display The color liquid crystal display (LCD) is composed of an LCD module, fluorescent lamps (FLs), and an FL inverter board. The thin film transistor (TFT) LCD is illuminated from the back. Thus, you can read its display clearly even in poorly lit conditions.

  • Page 15: Power Supply Unit

    Table 1-5 Color LCD specifications Power Supply Unit The universal auto-sensing power supply can be used world-wide and supplies +5, -5, +12, and -12 VDC to the system. The power supply unit is housed in the system unit and it supplies regulated power to the: System board Memory board 3.5-inch floppy disk drive (FDD)
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  • Page 17 Chapter 2 Troubleshooting Procedures...
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  • Page 19 Contents 2.1 T6400 Troubleshooting ......................2-5 2.2 Troubleshooting Flowchart ....................2-6 2.3 Power Supply Unit Troubleshooting Procedures ..............2-8 Procedure 1 AC Cord Check ....................2-9 Procedure 2 Connector Check ..................2-10 Procedure 3 Output Voltage Check ................. 2-11 2.4 System Board Troubleshooting Procedures ................ 2-12 Procedure 1 Message Check ....................
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  • Page 21: T6400 Troubleshooting

    T6400 Troubleshooting Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the T6400 is causing the computer to malfunction. The FRUs covered are: Power supply unit System board Floppy Disk Drive Hard Disk Drive Keyboard Display The following tools will assist you in performing the T6400 troubleshooting procedures.

  • Page 22: Troubleshooting Flowchart

    Use the flowchart in Figure 2-1 as a guide to determine which FRU troubleshooting procedures to execute. Before performing the flowchart procedures, perform the following: Disconnect all optional equipment from the T6400. Remove any diskette in the FDD. NOTE: If you forget the password and cannot start up the computer, connect the printer port wraparound board (F31PRT), then turn the POWER switch on.
  • Page 23 Insert the ASP Diagnostics diskette into the FDD, type A:TESTCE64, and press ENTER. Perform Keyboard Do typed Troubleshooting Procedures in characters appear Section 2.7. correctly? Connect wraparound connectors. Execute the Running Test several times. After confirming which test has Is an error detected an error, perform the detected by the appropriate troubleshooting proce-...

  • Page 24: Power Supply Unit Troubleshooting Procedures

    Wait a few minutes after turning the power off to allow the electricity to discharge. The T6400’s power supply unit generates a variety of voltages for each component. To determine if the power supply unit is functioning properly, perform the following checks as required. Start with Procedure 1 and continue with the other procedures as instructed.

  • Page 25: Procedure 1 Ac Cord Check

    Procedure 1 AC Cord Check The T6400’s AC cord carries AC voltage to the T6400’s power supply unit from a wall outlet. Check 1 Turn off the power, then disconnect the AC cord from the T6400. Use a multimeter to check the output voltage from the wall outlet and on the AC cord.

  • Page 26: Procedure 2 Connector Check

    Procedure 2 Connector Check The T6400’s power supply cables are connected on the system board. These cables may be discon- nected from the system board or damaged. Disassemble the T6400 following the steps described in Chapter 4 to check the power supply cables and their connections to the system board.

  • Page 27: Procedure 3 Output Voltage Check

    Procedure 3 Output Voltage Check The T6400’s power supply supplies five voltages to the system board. Check the output voltages of the power supply unit. Check 1 Remove the system board cover, connect the power supply cables to the system unit, connect the AC Cord, and turn on the power.

  • Page 28: System Board Troubleshooting Procedures

    System Board Troubleshooting Procedures To determine if the system board is defective or not functioning properly perform the following procedures beginning with Procedure 1 and continue with the other Procedures as required. Procedure 1: Message Check Procedure 2: Printer Port LED Check Procedure 3: Diagnostic Test Program Execution Check 2-12...

  • Page 29: Procedure 1 Message Check

    When the power is turned on, the system performs the Initial Reliability Test (IRT) installed in the BIOS ROM. The IRT tests each IC on the system board and initializes it. If an error message is displayed, perform Check 1. If not, go to Procedure 2. If Toshiba MS-DOS is properly loaded, go to Procedure 3.
  • Page 30 Check 3 The IRT tests the system board. When the IRT detects an error, the system stops or an error message appears. Refer to the messages in Table 2-2 to determine which test item failed. If one of the following (a) through (r) error messages is displayed, replace the system board.

  • Page 31: Procedure 2 Printer Port Led Check

    To use the printer port LED, follow these steps: Turn off the T6400’s power. Plug the printer port LED into the T6400’s PRT/FDD connector. Turn on the T6400’s power. Read the final LED status from left to right as you are facing the back of the com- puter.
  • Page 32 Table 2-2 Printer port LED test status Printer Port Test LED Indication Test Item Message Status Pre-init for warm start test TIMER CH. 2 OUT ERROR PIT ERROR PIT test READ DATA = XXH WRITE DATA = XXH PIT initialization PIT function test MEMORY REFRESH ERROR First 64KB memory test...
  • Page 33 Table 2-2 Printer port LED test status (continued) Printer Port Test LED Indication Test Item Message Status DMA PAGE REGISTER ERROR DMA page register test READ DATA = XXH WRITE DATA = XXH DMAC #1 ERROR READ DATA = XXXXH WRITE DATA = XXXXH DMAC test DMAC #2 ERROR...
  • Page 34 Check 1 If the following test codes are displayed, replace the system board with a new one. 01h, 05h, 06h, 07h, 0Ah, 0Dh, 15h, 16h, 18h, 1Fh, 22h, 25h, 30h, 40h, 41h, 42h, 54h, 65h, 70h, 80h, 90h, A0h, Check 2 If test code 4A is displayed, go to the Keyboard Troubleshooting Procedures in Sec- tion 2.7.

  • Page 35: Procedure 3 Diagnostic Test Program Execution Check

    Check 5 If test code 60 is displayed, go to the FDD Troubleshooting Procedures in Section 2.5. Procedure 3 Diagnostic Test Program Execution Check Execute the following tests from the Diagnostic Test Menu. Refer to Chapter 3, “Tests and Diag- nostics”...

  • Page 36: Floppy Disk Drive Troubleshooting Procedures

    Floppy Disk Drive Troubleshooting Procedures This section describes how to determine if the T6400’s internal 3.5" floppy disk drive is function- ing properly. Perform the procedures below starting with Procedure 1 and continuing with the other procedures as instructed. Procedure 1: FDD Head Cleaning Check Procedure 2: External 5-1/4"...

  • Page 37: Procedure 1 Fdd Head Cleaning Check

    FDD head cleaning is one of the options available in the Diagnostic Program. Detailed operation is described in Chapter 3, “Tests and Diagnostics.” After loading Toshiba MS-DOS, run the Diagnostic Program and then clean the FDD heads using the cleaning kit. If the FDD still does not function properly after cleaning, go to Procedure 3.

  • Page 38: Procedure 2 External 5-1/4" Fdd Check

    If the test program cannot be executed, go to Procedure 2. Procedure 2 External 5-1/4" FDD Check The floppy disk controller on the computer’s system board controls the internal and external FDD. To determine if either the system board or the internal FDD is defective, check the following items: Check 1 Connect the external 5-1/4"...

  • Page 39: Procedure 3 Diagnostic Test Program Execution Check

    Procedure 3 Diagnostic Test Program Execution Check The Floppy Disk Drive Diagnostic Test program is stored on the T6400 Diagnostic Disk. After loading Toshiba MS-DOS, run the Diagnostic Program (TESTCE64). Refer to Chapter 3, Tests and Diagnostics, for more information about the diagnostic test procedures.

  • Page 40: Procedure 4 Connector And Replacement Check

    The 3.5" Floppy Disk Drive is connected to the system unit by the FDD cable. This cable may be disconnected from the system unit or damaged. Disassemble the T6400 following the Procedures described in Chapter 4, Replacement Procedures, and perform the following checks.

  • Page 41: Hard Disk Drive Troubleshooting Procedures

    Check 3 Replace the system board with a new one following the steps in Chapter 4, Replace- ment Procedures. Hard Disk Drive Troubleshooting Procedures To determine if the hard disk drive is functioning properly, follow the procedures below starting with Procedure 1. Continue with the other procedures as instructed. Procedure 1: Message Check Procedure 2: Partition Check Procedure 3: Format Check...

  • Page 42: Procedure 1 Message Check

    BACKUP command. Procedure 1 Message Check When the T6400’s HDD is not functioning properly, some of the following error messages may appear on the display. Start with Check 1 below and perform the other checks as required.

  • Page 43: Procedure 2 Partition Check

    Procedure 2 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 3.

  • Page 44: Procedure 3 Format Check

    Procedure 2. Procedure 3 Format Check The T6400’s HDD is formatted using the low level (physical) format program and the Toshiba MS- DOS FORMAT program. To format the HDD, start with Check 1 below and proceed as instructed. Check 1 Using the Toshiba MS-DOS system disk, partition the hard disk using the FDISK command.

  • Page 45: Procedure 4 Diagnostic Test Program Execution And Replacement Check

    Procedure 4 Diagnostic Test Program Execution and Replacement Check The HDD test program is stored in the T6400 Diagnostic Disk. Perform all of the HDD subtests in the Hard Disk Drive Test. Refer to Chapter 3, Tests and Diagnostics for more information about the HDD test program.

  • Page 46: Keyboard Troubleshooting Procedures

    Replacement Procedures. Keyboard Troubleshooting Procedures To determine if the T6400’s keyboard 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 2-30...

  • Page 47: Procedure 1 Diagnostic Test Program Execution Check

    Procedure 2: Connector and Replacement Check Procedure 1 Diagnostic Test Program Execution Check Execute the keyboard test in the Diagnostic Test program. Refer to Chapter 3, Tests and Diagnos- tics for more information on how to perform the test program. 2-31...
  • Page 48 PS/2 keyboard port and PS/2 mouse port. These components and the keyboard are connected by two cables. These cables can become dis- connected or damaged. Disassemble the T6400 as described in Chapter 4 and follow the checks below. Check 1...

  • Page 49: Display Troubleshooting Procedures

    The system board may be damaged. Replace it with a new one. Display Troubleshooting Procedures This section describes how to determine if the T6400’s display is not functioning properly. Start with Procedure 1 and continue with the other procedures as instructed. The procedures described...

  • Page 50: Procedure 1 Brightness Volume Check (For Plasma Type)

    Procedure 4: Connector Check Procedure 5: Replacement Check Procedure 1 Brightness Volume Check (for Plasma Type) This check is for plasma displays. If your T6400 has a color LCD display, go to Procedure 2. 2-34...

  • Page 51: Procedure 2 External Crt Check

    If the brightness does not change when you adjust it, go to Procedure 2. Procedure 2 External CRT Check Connect the external CRT to the T6400’s RGB port, then cold boot the computer. The computer automatically detects the external CRT.

  • Page 52: Procedure 3 Diagnostic Test Program Execution Check

    3. Procedure 3 Diagnostic Test Program Execution Check The display test program is stored on the T6400 Diagnostic Diskette. This program checks the display controller on the system board. After loading Toshiba MS-DOS, run the Diagnostic Pro- gram (TESTCE64). Refer to Chapter 3, Tests and Diagnostics, for detailed instructions about the...

  • Page 53: Figure 1-7 Color Lcd

    Disassemble the display unit and check the following cable connections. Refer to Chapter LCD Module Inverter 1 4, Replacement Procedures, for more information about how to disassemble the T6400. System Board Inverter 2 If any of the cables are not connected, firmly reconnect them and perform Procedures 1 and 2 again.

  • Page 54: Procedure 5 Replacement Check

    If any of the cables are not connected, firmly reconnect them and perform Procedures 1 and 2 again. If the problem still exists, go to Procedure 5. Procedure 5 Replacement Check Color LCD The FL inverter board, LCD module, and system board are connected to the display circuits. Any of these units may be damaged.
  • Page 55 Chapter 3 Tests and Diagnostics...
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  • Page 57 Contents Diagnostic Program ......................3-5 Executing the T6400 Diagnostic Program ................. 3-7 Subtest Names ........................ 3-10 System Test ........................3-12 Memory Test........................3-13 Keyboard Test ......................... 3-15 Display Test ........................3-17 Floppy Disk Test ......................3-22 Printer Test ........................3-24 3.10...
  • Page 58 Tables Table 3-1 Subtest names......................3-10 Table 3-2 T6400 hardware bit status ..................3-12 Table 3-3 Error codes and error status names ................. 3-35 Table 3-4 HDC status register contents ................. 3-37 Table 3-5 HDC Error register contents ................... 3-38 Table 3-6 Hard disk formatting sequence ................

  • Page 59: Diagnostic Program

    Diagnostic Program This chapter explains how to use the T6400’s Diagnostic Program (TESTCE64) to test the func- tions of all the T6400’s hardware modules. The Diagnostic Program is located on the T6400 Diagnostic Diskette. The Diagnostic Programs consists of 20 programs that are divided into the Service Program Module (DIAGNOSTICS MENU) and the Test Program Module (DIAGNOSTIC TEST MENU).
  • Page 60 The following sections detail the tests within the Diagnostic Test function of the Service Program Module. Refer to Sections 3.17 through 3.23 for detailed information on the remaining eight Service Program functions.

  • Page 61: Executing The T6400 Diagnostic Program

    0 - SETUP PRESS [0] - [9] KEY NOTE: To exit from the DIAGNOSTIC TEST menu, press Ctrl + C. To exit the T6400 Diagnostic Program and return to MS-DOS, type 9 and press Enter. If a test program is in progress, press Ctrl + Break to exit the test.
  • Page 62 STATUS : xxx SUB-TEST MENU : 01 - ROM checksum 02 - HW status 99 - Exit to DIAGNOSTIC TEST MENU SELECT SUB-TEST NUMBER NOTE: The menu displayed by your T6400 may be slightly different from the one shown above.
  • Page 63 Enter the desired subtest number from the subtest menu and press Enter. The following message will appear. TEST LOOP (1:YES/2:NO) ? Selecting Yes increases the pass counter by one each time the test cycle ends and restarts the test cycle. Selecting No returns you to the subtest menu after the test is complete.

  • Page 64: Subtest Names

    Subtest Names Table 3-1 lists the subtests for each test program in the Test Program Module (DIAGNOSTIC TEST MENU). Table 3-1 Subtest names Subtest Test No. Test name Subtest name ROM checksum SYSTEM HW status RAM constant data RAM address pattern data RAM refresh MEMORY Protected mode...
  • Page 65 Table 3-1 Subtest names (continued) Test No. Test name Subtest Subtest name Sequential read Address uniquence (uniqueness) Random address/data Cross talk & peek (peak) shift Write/read/compare (CE) Write specified address Read specified address ECC circuit Sequential write W-R-C specified address Real time Backup memory REAL TIMER...

  • Page 66: System Test

    The System Test contains two subtests that test the ROM checksum and the Hardware Status of the T6400. Typing 1 and pressing Enter executes the ROM checksum test. Typing 2 and pressing Enter executes the HW status test.

  • Page 67: Memory Test

    The Memory Test contains five subtests that test the following T6400 memories: RAM constant data, RAM address pattern data, RAM refresh (real mode), protected mode, and memory module. Select the number corresponding to the subtest you want to execute and press Enter.
  • Page 68 Subtest 05 Memory Module NOTE: To execute the this subtest, an optional memory card must be installed in the T6400. This subtest is the same as subtest 04, and is used to test an optional memory card. Memory modules for the T6400 are available in 2MB, 4MB, and 8MB capacities.

  • Page 69: Keyboard Test

    To execute the Keyboard Test, type 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 T6400’s keyboard actions. Select the number corresponding to the subtest you want execute and press Enter.
  • Page 70 Subtest 03 Pressed Key Code Display When a key is pressed, the scan code, character code, and key top name are dis- played 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 video when pressed.

  • Page 71: Display Test

    Display Test To execute the T6400 Display Test, type 4 from the DIAGNOSTIC TEST MENU, press Enter, and follow the directions displayed on the screen. The Display Test contains eleven subtests that test the T6400’s display in various modes. Select the number corresponding to the subtest you want execute and press Enter.
  • Page 72 Subtest 03 Character Set In this subtest the character set (addressed 00h to FFh) is displayed in the 40x25 character mode as shown below. Press Ctrl + Break to return to the DISPLAY TEST menu. Subtest 04 80x25 Character Display In this subtest the character string is displayed shifting one character to the left, line by line in the 80x25 and 80x30 character modes as shown below.
  • Page 73 Subtest 05 Graphics Display (Color set 0/1) This subtest displays three of the color sets for the color display in the 320x200 dots graphics mode 4 and D as shown below. 320*200 GRAPHICS DISPLAY COLOR SET X : [X] GREEN YELLOW CYAN MAGENTA...
  • Page 74 Subtest 07 640x400 Graphics Display This subtest displays the color blocks for the black and white display in the 640x400 pixels graphics mode 10, 12, and 74 as shown below. 640*400 GRAPHICS DISPLAY : [XX] EVEN DOTS ODD DOTS ALL DOTS DRIVEN DRIVEN DRIVEN...
  • Page 75 Press Ctrl + Break to return to the DISPLAY TEST menu. Subtest 11 TFT 512 Color Display This subtest displays 512 shades of red, green, and blue on the T6400’s display. Press Ctrl + Break to return to the DISPLAY TEST menu. 3-21...

  • Page 76: Floppy Disk Test

    The Floppy Disk Test contains five subtests that test the T6400’s internal floppy disk drive. The following messages will appear after selecting the Floppy Disk Test from the DIAGNOSTIC TEST MENU. Answer each of the following questions with an appropriate response to execute the test.
  • Page 77 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): Track 0 to 39. Double-sided, double-density, double-track (2DD) and double-sided, high- density, double-track (2HD): Track 0 to 79.

  • Page 78: Printer Test

    = xxxxh Select the channel number (1-3) ? The printer I/O port address is specified by the xxxxh number. The T6400 supports three printer channels. Select the printer channel number and press Enter to execute the selected subtest. Subtest 01...
  • Page 79 Wraparound NOTE: To execute this subtest a printer wraparound connector must be connected to the T6400’s printer port. The printer wraparound connector (34M741986G01) wiring diagram is described in Appendix F. This subtest checks the output and bi-directional modes of the data control and status lines through the printer wraparound connector.

  • Page 80: Async Test

    3.10 ASYNC Test To execute the ASYNC Test, type 7 from the DIAGNOSTIC TEST MENU, press Enter, and follow the directions displayed on the screen. The ASYNC Test contains six subtests that test the T6400’s asynchronous communication functions. Subtests 01 through 04 require the following data format:...
  • Page 81 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). The wiring diagram for the RS-232-C direct cable is described in Appendix F. This subtest sends 20h through 7Eh data to the receive side, then receives the data back and compares it to the original data.

  • Page 82: Hard Disk Test

    The Hard Disk Test contains ten subtests that test the T6400 hard disk drive functions. The following messages will appear after selecting the Hard Disk Test from the DIAGNOSTIC TEST MENU. Answer each of the following questions with an appropriate response to execute the test.
  • Page 83 The HDD status is described in Section 3.15. Type 1 or 2 and press Enter. The HARD DISK TEST menu will appear after you respond to the detail status prompt. Select the number for the subtest you want to execute and press Enter. The following message will appear during each subtest.
  • Page 84 Worst pattern data: B5ADADh, 4A5252h, EB6DB6h, 149249h, 63B63Bh, 9C49C4h, 2DB6DBh, D24924h Subtest 05 Write/Read/Compare (CE) This subtest writes the worst pattern data (B5ADADh ) to the CE cylinder on the HDD, then reads the data from the CE cylinder and compares it with the original data.

  • Page 85: Real Timer Test

    To execute the Real Timer Test, type 8 from the DIAGNOSTIC TEST MENU, press Enter, and follow the directions on the screen. The Real Timer Test contains three subtests that test the T6400’s real timer functions. Subtest 01 Real Time...

  • Page 86: Numeric Data Processor Test

    (month, day, year, hour, minute, and second) 3.13 Numeric Data Processor Test NOTE: To execute this test, the 80486SX CPU must be changed to an 80486DX CPU. Subtest 01 NDP test This subtest checks the following functions of the numeric data processor: Control word Status word Addition...

  • Page 87: Expansion Unit Test

    This test also determines if the CPU is a 486SX without an NDP or a DX with the NDP. If the 486SX is installed, the test isn’t executed. If the 486DX is installed, the test is executed. 3.14 Expansion Unit Test NOTE: If an expansion unit is not connected to the system, this test cannot be executed.
  • Page 88 DMA #2 test (channel 5, 6) CCMCS test MDSPK test (buzzer) A17-23 test (B80000h, B40000h) Subtest 04 Wraparound Test (32-bus) NOTE: To execute this subtest, a wraparound board must be installed in the expansion unit. The following tests are executed. Clock test (OSC, CLK, ALE, DACK0) Interrupt test (IRQ7-3, IRQ14, IRQ12-9) DMA #1 test (channel 1...3, or TC status)
  • Page 89 Memory W/R test IO16 test MASTER test DMA #2 test (channel 5, 6) -12, +12, -5V test A17-23 test (B80000h, B40000h) Device name Error code Error status name (COMMON) Data Compare Error SYSTEM ROM Checksum Error Parity Error MEMORY Protected Mode Not Change Bad Command Address Mark Not Found Write Protected...

  • Page 90: Error Code And Error Status Names

    3.15 Error Code and Error Status Names Device name Error code Error status name DSR On Time Out CTS On Time Out RX-ENABLE Time Out TX-BUFFER Full Time Out Parity Error Framing Error ASYNC Overrun Error Line Status Error Modem Status Error NO CARRIER (Card Modem) ERROR (Card Modem) NO DIAL TONE (Card Modem)

  • Page 91: Hard Disk Test Detail Status

    Table 3-3 lists the error codes and error status names for the Diagnostic Test. Table 3-3 Error codes and error status names Table 3-3 Error codes and error status names (continued) 3.16 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 92 The contents of the HDC status register and error register are described in Tables 3-4 and 3-5. Name Description "0"--Otherwise. (Bad block mark) "1"--A bad block mark is detected. "0"--There is no uncorrectable data error. (Uncorrectable) "1"--Uncorrectable data error has been detected. ---- Not used.

  • Page 93: Hard Disk Format

    CAUTION: The contents of the hard disk will be erased when this program is executed. Before executing the program, transfer the contents of the hard disk onto a floppy disk(s). This can be done with the Toshiba MS-DOS BACKUP command. See the Toshiba MS-DOS manual for details.

  • Page 94: Operations

    HDD. Next, execute the Toshiba MS-DOS FORMAT command. Refer to the Toshiba MS-DOS manual for more information about using these commands. Select the HARD DISK FORMAT function by typing 2 and pressing Enter from the DIAG- NOSTICS MENU.
  • Page 95 Selecting the All track FORMAT option displays the following message. 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 (usually 1) and press Enter. The following message will appear.
  • Page 96 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 (usually 1) and press Enter. The following message will appear. [ HDD TYPE ] : CYLINDER = xxxx [ HDD TYPE ] : HEAD = xx [ HDD TYPE ] : SECTOR...

  • Page 97: Head Cleaning

    After checking the bad tracks on the hard disk, the following message will appear. Format complete Press Enter to return to the HARD DISK FORMAT menu. 3.18 Head Cleaning 3.18.1 Function Description This function cleans the heads in the FDD by executing a series of head load/seek and read opera- tions.

  • Page 98: Seek To Landing Zone (Hdd)

    When the Cleaning start message appears, the FDD head cleaning has begun. The display automatically returns to the DIAGNOSTICS MENU when the function is completed. 3.19 Seek to Landing Zone (HDD) 3.19.1 Function Description When transporting the computer, the HDD heads can hit a surface on the HDD containing data. This can damage the disk surface, thus causing a permanent loss of data.

  • Page 99: Log Utilities

    will appear. Landing seek complete. (HDD#1) Press [Enter] key. After pressing Enter, the DIAGNOSTICS MENU appears. 3.20 Log Utilities 3.20.1 Function Description This function logs error information generated while a test is in progress and stores the results in RAM. This function can store data on a floppy disk or output the data to a printer. If the power switch is turned off, the error information will be lost.
  • Page 100 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 ]] The error information displayed on the screen can be manipulated with the following number keys. Number Function Scrolls the display to the next page. Scrolls the display to the previous page.

  • Page 101: Running Test

    Selecting Yes executes the printer wraparound test. A printer wraparound connector must be connected to the PRT/FDD port on the back of the T6400 to properly execute this test. Type Y or N and press Enter. The following message will appear.

  • Page 102: Floppy Disk Drive Utilities

    Selecting Yes executes the ASYNC wraparound test. An RS-232-C wraparound connector must be connected to the SERIAL A or SERIAL B port on the back of the T6400 to prop- erly execute this test. Type Y or N and press Enter to start the test.
  • Page 103 1 : FORMAT 2 : COPY 3 : DUMP 9 : EXIT TO DIAGNOSTICS MENU PRESS [1] - [9] KEY FORMAT option Selecting FORMAT displays the following message. DIAGNOSTICS - FLOPPY DISK FORMAT : Vx.xx Drive number select (1=A:,2=B:) ? Select a drive number and press Enter to display the following message.
  • Page 104 Format complete Another format (1:Yes/2:No) ? If you select Yes, the display will repeat the message in step (3) above. If you select No, the display returns to the DIAGNOSTICS MENU. COPY option When COPY is selected, the following message appears. FLOPPY DISK FORMAT &...
  • Page 105 DUMP option When DUMP is selected, the following message appears. DIAGNOSTICS - HARD DISK & FLOPPY DISK DUMP :Vx.xx Format type select (0:2DD-2DD,1:2D-2D,2:2D -2HD,3:2HD-2HD)? Select a format type number. Type the number. If 3 is selected, the display will go to the message in step (5) below.

  • Page 106: System Configuration

    2, the display will return to the DIAGNOSTICS MENU. 3.23 System Configuration 3.23.1 Function Description The System Configuration function contains the following configuration information for the T6400: BIOS ROM version Base memory size Display mode Number of floppy disk drives...

  • Page 107: Setup

    * - 0 MATH CO-PROCESSOR * - xxxxxKB EXTENDED MEMORY PRESS [ENTER] KEY ? Press Enter to return to the DIAGNOSTICS MENU. 3.24 SETUP 3.24.1 Function Description This function displays the current system setup information as listed below. MEMORY Total Base Extended Memory Shadow BIOS...

  • Page 108: Accessing The Setup

    Display Auto Off Numlock Init. State POWER ON PASSWORD TIME & DATE T6400 SETUP MEMORY COM/PRT/FDD Serial Port = COM1(IRQ4/3F8H) Total 4096KB Base 640KB Built-in Modem = COM2(IRQ3/2F8H) Extended 3328KB Expansion Slot = IRQ3 Disable Shadow BIOS 128KB External FDD/PRT...

  • Page 109: Changing Setup Values

    3.24.3 Changing SETUP Values The SETUP values for the T6400 can be changed automatically to their default settings or manu- ally to user-defined settings. Automatic Reset Follow these steps to set all of the SETUP options to their default settings.

  • Page 110: Setup Option Descriptions

    This section explains the alternate settings for each SETUP option. MEMORY This group of options displays the configuration of the memory installed in the T6400. This is only for your information and cannot be changed through the SETUP function. TOTAL The SETUP function automatically calculates the total amount of memory that is built into the T6400 and displays it.
  • Page 111 CRT via the RGB port on the back of the computer. If a CRT is connected to the T6400, the display mode of the plasma display is set to either color or monochrome, according to the type of the CRT (color or mono- chrome).
  • Page 112 CRT via the RGB port on the back of the computer. If a CRT is connected to the T6400, the display mode of the color LCD display is set to either color or monochrome, according to the type of the CRT (color or mono- chrome).
  • Page 113 This option selects whether the color LCD display uses monochrome mode or color mode. If there is a CRT attached to the T6400, the display mode of the color LCD display is determined by the type of the CRT (either monochrome or color), and the setting for this option has no effect.
  • Page 114 COM/PRT/FDD This group of options allows you to set the serial and parallel ports and the built-in modem. The serial port interrupt level (IRQ) and I/O port base address for each COM level are shown below. SERIAL PORT This option allows you to select either COM1 or COM2 for the serial port. Assigns COM1 to the serial port.
  • Page 115 FDD becomes drive A. PRINTER PORT TYPE When the PRT/FDD port on the rear panel of the T6400 is set for output to the Printer as opposed to the external FDD, this option lets you change the printer port from output only to receive input as well as output.
  • Page 116 Leaves the Numlock key off when the computer is turned on or rebooted. POWER ON PASSWORD This option allows you to enable or disable the password required for the T6400 to power on and allow access to the C prompt. Enables the Power On Password function. The computer will...
  • Page 117 NOTE: If you use the printer wraparound connector to disable the Power On Password function, make sure you inform the customer of the change when returning the computer. ENABLING THE POWER ON PASSWORD FUNCTION NOTE: Once you register a password, you must enter it at the password prompt every time you turn on or restart the computer.
  • Page 118 Password= Enter the currently registered password. The character string you enter is displayed as a string of asterisks. Password=**** Press Enter. If the character string you entered matches the registered password, the password option is reset and the display changes to: Not Registered.
  • Page 119 Chapter 4 Replacement Procedures...
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  • Page 121 Contents General ................................4-5 4.1.1 Before You Begin ..........................4-5 4.1.2 Disassembly Procedures ........................4-6 4.1.3 Installation (Reassembly) Procedures ..................... 4-6 4.1.4 Tools and Equipment ........................4-7 Keyboard ............................... 4-8 4.2.1 Removing the Keyboard ........................4-8 4.2.2 Installing the Keyboard Assembly ....................4-11 Central Processor Unit and Oscillator ......................
  • Page 122 Figures Figure 4-1 Removing the seven system board cover screws ................4-8 Figure 4-2 Removing the keyboard cable ......................4-9 Figure 4-3 Removing the keyboard base ......................4-9 Figure 4-4 Removing the scan controller screws ....................4-10 Figure 4-5 Disconnecting the keyboard cable and keyboard interface cable ..........4-10 Figure 4-6 Removing the keyboard from the keyboard cover ................

  • Page 123: General

    FRUs need to be removed so you can replace the one that is causing the T6400 to operate abnormally. Always start by removing the AC Power Cord, then follow the lines on the chart below to the FRU you are removing.

  • Page 124: Disassembly Procedures

    4.1.3 Installation (Reassembly) Procedures After you have disassembled the T6400 and fixed or replaced the FRU, you will need to reassemble the T6400. Some difficult assemblies are pointed out in the manual, however, most of the time it is sufficient to follow the steps you took to disassemble the T6400 in reverse order.

  • Page 125: Tools And Equipment

    Be sure to use the correct screws to secure the various parts. Screw sizes are listed in the corresponding Figures. Make sure you replace all the screws that were removed during disassembly. After installing an FRU in the T6400 confirm that the FRU and the T6400 are functioning properly. 4.1.4 Tools and Equipment The use of ElectroStatic Discharge (ESD) equipment is very important to your safety and the safety of those around you.

  • Page 126: Keyboard

    4.2.1 Removing the Keyboard Open the Display on the T6400. Remove the Keyboard as if you were going to use the T6400. Place the Keyboard in front of the computer. Remove the seven M2.5x4 Silver Screws securing the System Board Cover to the Top Cover (Figure 4-1).
  • Page 127 Locate where the Keyboard Cable connects to the System Board in the upper right corner of the T6400 (Figure 4-2). Remove the single M2.5x8 Ground Screw securing the Key- board Cable. Then disconnect the Keyboard Cable from PJ909 on the System Board.
  • Page 128 Separate the Keyboard from the Keyboard Base. Locate the Scan Controller Board in the upper left corner of the Keyboard, where the Keyboard Cable is connected to the Keyboard (Figure 4-4). Remove the two M2.5x6 Screws securing the Scan Controller Board to the Keyboard (Figure 4-4).

  • Page 129: Installing The Keyboard Assembly

    To remove the Keyboard from the Keyboard Cover, remove the two M2.5x4 Screws securing the Keyboard to the Keyboard Cover (Figure 4-6). Figure 4-6 Removing the keyboard from the keyboard cover 4.2.2 Installing the Keyboard Assembly Place the Keyboard in the Keyboard Cover (Figure 4-6). Secure the Keyboard in place with the two M2.5x4 Screws.

  • Page 130: Central Processor Unit And Oscillator

    Remove the System Board Cover as instructed in steps 1-4 of Section 4.2. Locate the CPU on the left side of the T6400 (Figure 4-7). To release the CPU from its socket, lift the lever on the left side of the CPU socket in the direction of the arrow shown in Figure 4-7.

  • Page 131: Removing The Oscillator

    4.3.2 Removing the Oscillator NOTE: If you are replacing or upgrading the T6400 CPU with another CPU that has a different CPU operating speed, you also have to change the Oscillator. Locate the Oscillator just behind the CPU (Figure 4-9).
  • Page 132 Press down on the CPU to firmly connect it with the System Board. Lower the lever on the CPU Socket and latch it under the clip on the side of the socket. To install the Oscillator, align the Oscillator with the Oscillator Socket. Note that the connector is keyed for proper alignment of Pin 1 on the Oscillator (Figure 4-11).

  • Page 133: Top Cover

    Top Cover 4.4.1 Removing the Top Cover Remove the System Board Cover as instructed in steps 1-4 of Section 4.2. Remove the three M2.5x4 Silver Screws securing the Built-in Modem Cover to the Base Assembly (Figure 4-12). Remove the two M2.5x4 Silver Screws securing the Built-in Modem Case to the Base Assembly.
  • Page 134 M2.5x4 silver screw Figure 4-13 Removing the seven screws Turn the T6400 so that its Rear Cover is facing you. Remove the four outside M2.5x4 Silver Screws and three outside M2.5x6 Silver Screws (Figure 4-14). Then remove the Rear Cover.
  • Page 135 Turn the T6400 right side up and open the Display. Remove the Right Display Hinge Cover. Remove the single M3x8 Screw (Figure 4-15). Figure 4-15 Removing the display hinge screw Remove the five M2.5x8 Screws. Then remove the External 3.5" FDD Port Cover and slide the Handle out until it is fully extended (Figure 4-16).

  • Page 136: Installing The Top Cover

    Display Hinge Cover into place (Figure 4-15). Close the Display. Turn the T6400 over and install the Rear Support. Secure the Rear Support in place with the three or four M2.5x4 Silver Screws, depending on the Power Supply Unit (Figure 4- 14).
  • Page 137 If necessary, install and secure the Built-in Modem. Then install the Built-in Modem Case and secure it in place with the two M2.5x4 Silver Screws (Figure 4-12). Install the Built-in Modem Cover and secure it in place with the three M2.5x4 Silver Screws (Figure 4-12).

  • Page 138: System Board

    System Board 4.5.1 Removing the System Board Remove the Top Cover as instructed in Section 4.4. Remove the two M3x6 Screws securing the I/O Interface Board in place (Figure 4-18). Gently lift the I/O Interface Board straight up to disconnect it from PJ910 on the System Board (Figure 4-18).

  • Page 139: Installing The System Board

    Gently lift the System Board out of the T6400. 4.5.2 Installing the System Board Place the System Board in the T6400, making sure the Built-in Modem connector port fits properly into the cutout on the Base Assembly. Make sure the HDD Cable, FDD Cable, Speaker Cable, and DC Fan Cables are not beneath the System Board.

  • Page 140: Floppy Disk Drive

    Remove the System Board as instructed in Section 4.5. Remove the four M2.5x4 Screws securing the FDD in place. Then lift the FDD and its bracket out of the T6400 (Figure 4-21). Figure 4-21 Removing the four FDD screws To remove the FDD Bracket, remove the three M2.5x4 Screws securing the FDD to the FDD Bracket (Figure 4-22).

  • Page 141: Installing The 3.5" Floppy Disk Drive

    Place the FDD in the T6400. Make sure the front of the FDD is properly aligned with the FDD Mask (CD Attachment) on the Base Assembly. Secure the FDD and the FDD Bracket with the four M2.5x4 Screws (Figure 4-21).

  • Page 142: Hard Disk Drive

    Remove the System Board as instructed in Section 4.5. Remove the four M2.5x4 Screws securing the HDD and the HDD Bracket in place. Then lift the HDD and its bracket out of the T6400 (Figure 4-23). Figure 4-23 Removing the HDD To remove the HDD Bracket, remove the four Special Screws securing the HDD to the HDD Bracket.

  • Page 143: Installing The 3.5" Hard Disk Drive

    Secure the HDD Bracket to the HDD with the four Special Screws (Figure 4-24). Place the HDD in the T6400. Two alignment tabs are located on either side of the HDD Bracket. Make sure the HDD cable connector is facing the front of the T6400. Secure the HDD and HDD Bracket with the four M2.5x4 Screws (Figure 4-23).

  • Page 144: Speaker

    Speaker 4.8.1 Removing the Speaker Remove the System Board as instructed in Section 4.5. Remove the two M2x4 Screws securing the Speaker to the T6400. Then remove the Speaker from the T6400 (Figure 4-25). Figure 4-25 Removing the speaker 4.8.2 Installing the Speaker Place the Speaker in the T6400.

  • Page 145: Dc Fans

    Install the DC Fans on the Assembly Bracket. Position the fans so that the manufacturer’s labels are upside down and face the vents on the Base Assembly. Secure the DC Fans in place with the four Special Screws (Figure 4-26). Place the DC Fan and the Assembly Bracket in the T6400. 4-27...

  • Page 146: Power Supply Unit

    NOTE: Do not install any screws at this point. Place the Power Supply Unit in the T6400 (Figure 4-27). Secure the Power Supply Unit in place with the five M3x6 Screws (Figure 4-27).

  • Page 147: Led Board And Display Shut-Off Switch

    4.11.1 Removing the LED Board and Display Shut-Off Switch Remove the Power Supply Unit as instructed in Section 4.10. Remove the two M2.5x4 Screws securing the LED Board to the T6400 (Figure 4-28). Rotate the LED Board as shown in Figure 4-28 and disconnect the Display Shut-Off Switch Cable from PJ802 on the LED Board.

  • Page 148: Installing The Led Board And Display Shut-Off Switch

    4.11.2 Installing the LED Board and Display Shut-Off Switch Install the Display Shut-Off Switch and secure it in place with the single M2x8 Screw (Figure 4-29). Connect the Display Shut-Off Switch Cable to PJ802 on the LED Board and rotate the board into the computer.

  • Page 149: Display Mask

    4.12 Display Mask 4.12.1 Removing the Display Mask Open the Display (Figure 4-30). Remove the Rubber Cushions from the top of the Display and the Display Hinge Covers from the bottom of the Display. Remove the two M2.5x8 Silver Bottom Screws and the two M2.5x4 Silver Top Screws securing the Display Mask.

  • Page 150: Installing The Display Mask

    Separate the Display Mask from the Back Display Cover. Start with step 1 as shown in Figure 4-31 and proceed with steps 2, 3 and 4. After all the latches on the Display Mask are released, remove the Display Mask from the T6400. Figure 4-31 Removing the display mask 4.12.2 Installing the Display Mask...

  • Page 151: Gas Plasma Display

    4.13 Gas Plasma Display 4.13.1 Removing the Gas Plasma Display Remove the Display Mask as described in Section 4.12. Remove the M2.5x4 Screw securing the Brightness Control Board and disconnect the Brightness Control Cable from PJ803 on the Brightness Control Board (Figure 4-32). Figure 4-32 Removing the brightness control board Remove the six M2.5x4 Screws securing the Gas Plasma Display and the one M2.5x4 Screw securing the DC-DC Converter (Figure 4-33).
  • Page 152 Gently lift the Gas Plasma Display out of the T6400 and lay it on the Top Cover of the computer. Disconnect the Display Cables from J1A, J1B, and J3. Then disconnect the DC-DC Converter Cable from PJ803 (Figure 4-34). Figure 4-34 Disconnecting the display cables Disconnect the DC-DC Converter Cable on the Gas Plasma Display.

  • Page 153: Installing The Gas Plasma Display

    To remove the Back Display Cover, remove the three M2.5x4 Screws securing the Back Display Cover to the Display Hinges (Figure 4-36). Figure 4-36 Removing the three back display cover screws 4.13.2 Installing the Gas Plasma Display If necessary, install the Back Display Cover and secure it in place with the three M2.5x4 Screws (Figure 4-36).

  • Page 154: Sharp Color Lcd

    4.14 Sharp Color LCD 4.14.1 Disassembling the Sharp Color LCD Remove the Display Mask as described in Section 4.12. Remove the two M2.5x4 Screws securing the DC-DC Converter Board (Figure 4-37). Disconnect the cables from the top and the bottom of the DC-DC Converter Board. Figure 4-37 Removing the DC-DC converter board Remove the three M2.5x4 Screws securing the FL Inverter Board (Figure 4-38).
  • Page 155 Disconnect the three cables on the FL Inverter Board (Figure 4-39). Remove the FL Inverter Board from the T6400. Figure 4-39 Disconnecting the FL inverter cables Remove the four M2.5x4 Screws securing the Color LCD to the Back Display Cover (Figure 4-40).

  • Page 156: Installing The Sharp Color Lcd

    To remove the Back Display Cover, remove the four M2.5x4 Screws securing the Back Display Cover to the Display Hinges (Figure 4-42). Figure 4-42 Removing the four back display cover screws 4.14.2 Installing the Sharp Color LCD If necessary, install the Back Display Cover and secure it in place with the four M2.5x4 Screws (Figure 4-42).

  • Page 157: Dti Color Lcd

    4.15 DTI Color LCD 4.15.1 Disassembling the DTI Color LCD Remove the Display Mask as described in Section 4.12. Remove the three M2.5x4 Screws securing the FL Inverter Board (Figure 4-43). Discon- nect the five cables from the FL Inverter Board. M2.5x4 screws FL inverter...

  • Page 158: Installing The Dti Color Lcd

    To remove the Back Display Cover, remove the four M2.5x4 Screws securing the Back Display Cover to the Display Hinges (Figure 4-45). Figure 4-45 Removing the four back display cover screws 4.15.2 Installing the DTI Color LCD If necessary, install the Back Display Cover and secure it in place with the four M2.5x4 Screws (Figure 4-45).

  • Page 159: Display Cable

    4.16 Display Cable 4.16.1 Removing the Display Cable Remove the Power Supply Unit, Display Mask, and Display as instructed in Sections 4.10; 4.12; and 4.12, 4.13, or 4.14 (depending on the display type). Turn the Top Cover upside down. Release the Display Cable from its clip. Remove the M2.5x4 Silver Screw securing the Display Cable Cover (Figure 4-46).
  • Page 160 This page intentionally left blank 4-42...
  • Page 161 Appendices App-1...
  • Page 162 This page intentionally left blank App-2...
  • Page 163 Contents Appendix A Board Layouts System Board (FVCSYx) (ICs) .................... App-5 System Board (FVCSYx) (Connectors) ................App-7 System Board (FVCSYx) (Oscillators) ................App-10 LED Board (FVCLEx) ......................App-12 I/O Interface Board (FVCFDx) ..................App-12 Keyboard Scan Controller Board (FVCKBx) ..............App-12 Appendix B Pin Assignments for System Board PJ1 Memory Slot-A Connector (88-Pin) ................
  • Page 164 Tables Table A-1 ICs on the system board FVCSYx ..................App-6 Table A-2 Connectors on the system board FVCSYx ................App-9 Table A-3 Oscillators on the system board FVCSYx ................App-11 Table B-1 Memory slot-A connector pin assignment (88-pin) ............. App-13 Table B-2 Memory slot-B connector pin assignment (88-pin) .............

  • Page 165: Appendix A Board Layouts

    Appendix A Board Layouts System Board (FVCSYx) (ICs) (11) (10) Figure A-1 System board FVCSYx (ICs) (front) App-5...
  • Page 166 Table A-1 ICs on the system board FVCSYx Callout Number Name Central processing unit (CPU) 80486SX/80486DX System controller gate array Super integration (SI) T9901 IC413 Color gray scale controller (CGSC) IC412 Digital analog connector (DAC) IC21 Real time clock (RTC) IC407 PVGA1F IC408, IC409...

  • Page 167: System Board (Fvcsyx) (Connectors)

    System Board (FVCSYx) (Connectors) (20) (19) (18) (17) (16) (15) (14) (13) (12) (11) (10) Figure A-3 System board FVCSYx (connectors) (front) App-7...
  • Page 168 (24) (21) (23) (22) Figure A-4 System board FVCSYx (connectors) (back) App-8...
  • Page 169 Table A-2 Connectors on the system board FVCSYx Callout Number Name PJ907 Fan interface connector PJ906 Fan interface connector Expansion memory connector PJ406 Expansion port PJ408 LED connector PJ405 CRT I/O port EXT FDD/PRT port RS-232-C port PJ910 I/O board interface connector (10) PJ901 Power supply connector...

  • Page 170: System Board (Fvcsyx) (Oscillators)

    System Board (FVCSYx) (Oscillators) Figure A-5 System board FVCSYx (oscillators) (front) App-10...
  • Page 171 Table A-3 Oscillators on the system board FVCSYx Callout Number Name 14.7456 MHz for serial O/I controller 24 MHz for floppy disk controller and variable frequency oscillator 14.31818 MHz for keyboard controller X904 36.0 MHz for display controller 44.9 MHz for display controller X902 25.175 MHz for display controller X901...

  • Page 172: Led Board (Fvclex)

    LED Board (FVCLEx) Figure A-7 LED board I/O Interface Board (FVCFDx) Figure A-8 I/O interface board Keyboard Scan Controller Board (FVCKBx) Figure A-9 Keyboard scan controller board App-12...

  • Page 173: Appendix B Pin Assignments For System Board

    Appendix B Pin Assignments for System Board PJ1 Memory Slot-A Connector (88-Pin) Table B-1 Memory slot-A connector pin assignment (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 GND (Pull down) GND (Pull down) MA00;111 MA01;111...

  • Page 174: Pj2 Memory Slot-B Connector (88-Pin)

    PJ2 Memory Slot-B Connector (88-Pin) Table B-2 Memory slot-B connector pin assignment (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 GND (Pull down) GND (Pull down) MA00;112 MA01;112 MA02;112 MA03;112 MA05;112 MA04;112...

  • Page 175: Pj3 Modem Connector (30-Pin)

    PJ3 Modem Connector (30-Pin) Table B-3 Modem connector pin assignment (30-pin) Signal Signal BMDMSL;000 SD02;100 $14R7M;003 SD01;100 SA00;100 SA01;100 SD00;100 SA02;100 IOW;000 IOR;100 SD07;100 SD06;100 RESET;100 BMPOFF;100 SD05;100 SD04;100 BMIRQ;000 SD03;100 BSPTON;000 PJ4 EXT FDD/PRT Connector (25-Pin) Table B-4 EXT FDD/PRT connector pin assignment (25-pin) Signal Signal STROB;000...

  • Page 176: Pj5 Int Fdd Connector (26-Pin)

    PJ5 INT FDD Connector (26-Pin) Table B-5 INT FDD connector pin assignment (26-pin) Signal Signal ISTEP;000 IINDEX;000 IWDAT;000 IDSL;010 IWEN;010 DSKCHG;000 ITRO;000 IRDY;000 IHMED;000 IWPR;000 IMON;000 ILOWD;000 IRDAT;000 IDIRC;000 ISSEL;000 PJ6 HDD Power Connector (3-Pin) Table B-6 HDD power connector pin assignment (3-pin) Signal Signal P12V1...

  • Page 177: Pj7 Hdd I/F Connector (40-Pin)

    PJ7 HDD I/F Connector (40-Pin) Table B-8 HDD I/F connector pin assignment (40-pin) Signal Signal HRST;000 HSD07;100 HIOW;000 HSD08;100 HSD06;100 HIOR;000 HSD09;100 HSD05;100 CHRDY;100 HSD10;100 HBALE;100 HSD04;100 HSD11;100 HSD03;100 IRQ14;100 HSD12;100 IO16;100 HSD02;100 HSA01;100 HSD13;100 HSD01;100 HAS00;100 HSD14;100 HAS02;100 HSD00;100 HCD0CS;020 HSD15;100 HDC1CS;020...

  • Page 178: Pj404 Display Connector (34-Pin)

    B.10 PJ404 Display Connector (34-Pin) Table B-10 Display connector pin assignment (34-pin) Signal Signal P24V P24V PLTB1;120 PLTB2;120 PLTR0;120 DFLTCK;120 PLTR1;120 DLP;120 PLTR2;120 DFP;120 DENAB;120 PLTG0;120 PNEL0;100 PLTG1;120 PNEL1;100 PLTG2;120 PLTB0;120 P12V1 B.11 PJ405 CRT I/O Connector (15-Pin) Table B-11 CRT I/O connector pin assignment (15-pin) Signal Signal CRED;110...

  • Page 179: Pj406 Expansion Connector (150-Pin)

    B.12 PJ406 Expansion Connector (150-Pin) Table B-12 Expansion connector pin assignment (150-pin) Signal Signal SD07;101 SMEW;001 SMER;001 IOW;001 IOR;001 TC;101 BALE;101 RESET;101 DACK1;001 RVCC IRQ9;101 RGND PCNF;101 MDMSL;001 $SYSCK;121 $14R7M;022 IRQ5;101 MIRQ;001 DRQ3;101 SPKTON;001 DACK3;001 AEN;101 SA00;101 DRQ1;101 SA01;101 IOCRDY;101 SA02;101 SA03;101 IRQ10;101...

  • Page 180: Pj407 Speaker I/F Connector (2-Pin)

    Table B-12 Expansion connector pin assignment (150-pin) (continued) Signal Signal IOCHCK;001 PDB00;100 MMCS16;001 PDB01;100 PDB02;100 IOCS16;001 PDB03;100 DACK2;001 PDB04;100 DRQ6;101 PDB05;100 DRQ5;101 PDB06;100 DACK5;001 PDB07;100 MEMR;001 ACK;000 IRQ4;101 BUSY;100 MEMW;001 PE;100 IRQ7;101 SELCT;100 AUTFD;000 CRED;100 ERROR;000 CGREEN;100 PINIT;000 CBLUE;100 SLIN;000 LP;110 SD1;000 FP;110...

  • Page 181: Pj411 Feature Connector (26-Pin)

    B.15 PJ411 Feature Connector (26-Pin) Table B-15 Feature connector pin assignment (26-pin) Signal Signal SLD0;100 FEASEN;100 SUD3;100 SLD1;100 PCLK;100 SLD2;100 FR;100 SLD3;100 LP;100 SUD0;100 FP;100 SUD1;100 SUD2;100 B.16 PJ412 DVI Support Connector (34-Pin) Table B-16 DVI support connector pin assignment (34-pin) Signal Signal DACR0;100...

  • Page 182: Pj413 Isa Slot Connector (104-Pin)

    B.17 PJ413 ISA Slot Connector (104-Pin) Table B-17 ISA slot connector pin assignment (104-pin) Signal Signal SD15;102 SA05;102 DACK2;002 SD14;102 SA06;102 MASTER;002 IRQ3;102 SD13;102 SA07;102 IRQ4;102 SD12;102 SA08;102 DRQ7;102 IRQ5;102 SD11;102 SA09;102 DACK7;002 IRQ6;102 SD10;102 SA10;102 DRQ6;102 IRQ7;102 SD09;102 SA11;102 DACK6;002 $SYSCK;122 SD08;102...

  • Page 183: Pj901 Ps I/F Connector (6-Pin)

    B.18 PJ901 PS I/F Connector (6-Pin) Table B-18 PS I/F connector pin assignment (6-pin) Signal Signal P12V1 P12V1 M12V P12V2 P24V B.19 PJ902 PS I/F Connector (4-Pin) Table B-19 PS I/F connector pin assignment (4-pin) Signal Signal B.20 PJ906 Fan I/F Connector (2-Pin) Table B-20 Fan I/F connector pin assignment (2-pin) Signal Signal...

  • Page 184: Pj910 I/O Board I/F Connector (40-Pin)

    B.23 PJ910 I/O Board I/F Connector (40-Pin) Table B-23 I/O board I/F connector pin assignment (40-pin) Signal Signal EXKBCK;100 ISTEP;000 EXKBDT;100 IDIRC;000 MUSDAT;130 ILOWD;000 MUSCLK;020 IMON;000 ISSEL;000 IHMED;000 IRDAT;000 IRDY;000 IWPR;000 DSKCHG;000 ITRO;000 IDSL;011 IWEN;011 IINDEX;000 IWDAT;000 App-24...

  • Page 185: Appendix Cascii Character Codes

    Appendix C ASCII Character Codes Table C-1 ASCII character codes App-25...

  • Page 186: Appendix D Keyboard Scan/Character Codes

    Appendix D Keyboard Scan/Character Codes Table D-1 KB code to ASCII code conversion table Lower Upper Caps Lock With With Case Case Lower Upper (Ctrl) (Alt) 29 60 29 7E 29 60 29 7E 29 00 29 60 29 7E 29 60 29 7E 02 31...
  • Page 187 Table D-1 KB code to ASCII code conversion table (continued) Lower Upper Caps Lock With With Case Case Lower Upper (Ctrl) (Alt) 17 69 17 49 17 49 17 69 17 09 17 00 17 69 17 49 17 49 17 69 17 09 17 00...
  • Page 188 Table D-1 KB code to ASCII code conversion table (continued) Lower Upper Caps Lock With With Case Case Lower Upper (Ctrl) (Alt) 2E 63 2E 43 2E 43 2E 63 2E 03 2E 00 2E 63 2E 43 2E 43 2E 63 2E 03 2E 00...
  • Page 189 Table D-1 KB code to ASCII code conversion table (continued) Lower Upper Caps Lock With With Case Case Lower Upper (Ctrl) (Alt) 01 1B 01 1B 01 1B 01 1B 01 1B 01 1B 01 1B 01 1B 01 1B 01 1B 01 00 3B 00...

  • Page 190: Appendix E Keyboard Layouts

    Appendix E Keyboard Layouts USA Keyboard Figure E-1 USA keyboard UK Keyboard Figure E-2 UK keyboard App-30...

  • Page 191: German Keyboard

    German Keyboard Figure E-3 German keyboard French Keyboard Figure E-4 French keyboard App-31...

  • Page 192: Spanish And Latin American Keyboard

    Spanish and Latin American Keyboard Figure E-5 Spanish and Latin American keyboard Italian Keyboard Figure E-6 Italian keyboard App-32...

  • Page 193: Scandinavian (Dk, No, Sw) Keyboard

    Scandinavian (DK, NO, SW) Keyboard Figure E-7 Scandinavian (DK, NO, SW) keyboard Swiss (French/German) Keyboard Figure E-8 Swiss (French/German) keyboard App-33...

  • Page 194: Appendix F Wiring Diagrams

    Appendix F 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 F-1 Printer wraparound connector RS-232-C Wraparound Connector Figure F-2 RS-232-C wraparound connector RS-232-C Direct Cable (9-Pin to 9-Pin) Figure F-3 RS-232-C direct cable (9-pin to 9-pin)

  • Page 195: Rs-232-C Direct Cable (9-Pin To 25-Pin)

    RS-232-C Direct Cable (9-Pin to 25-Pin) (22) RI (20) DTR Figure F-4 RS-232-C direct cable (9-pin to 25-pin) App-35...
  • Page 196 T6400 NOTES...
  • Page 197 Inside Back Cover Inside Back Cover Replace with blank page Replace with blank page...
  • Page 198 Toshiba America Information Systems, Inc. Computer Systems Division 9740 Irvine Boulevard P.O. Box 19724 Irvine, CA 92713-9724...

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