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HCD-DX375
6-5. BLOCK DIAGRAM – POWER SECTION –
T801
DC/DC
CONVERTER
F1
F2
TO FLUORESCENT
INDICATOR TUBE
D801,802
VFL
D804,805
RECT
IC501 (4/4)
SYSTEM CONTROLLER
P CONT2
40
P CONT1
39
P CONT3
41
AC_CUT
20
Q503
RESET
12
HCD-DX375
+31.5V
+5V
Q801
OSC
A12V
IC360
+9V
+9V REG
SW+9V
IC707
+5V
+5V REG
A+5V
IC502
+3.3V
+3.3V REG
IC105
+3.3V
+3.3V REG
SW +5V
IC703
+3.3V
+3.3V REG
IC107
RF+3.3V
+3.3V REG
E3.3V
D502
+1.8V
BMP3.3V
D504
+1.8V
+1.8V
IC503
RESET
SW+3.3V,+3.3V
D3.3V
E RF SECTION
(Page 34)
T901
TRANSFORMER(MAIN)
D931
IC931
VOLTAGE
DETECT
PC901
PHOTO
COUPLER
E4V
Q943,947
PC903
VOLTAGE
PHOTO
DETECT
COUPLER
IC941
+12V REG
Q945
MOTOR DRIVE
CONTROLLER
IC504
+5VREG
+6V
IC942
Q504
D+5V REG
5V SW
E 4V
IC110
IC943
+1.8V REG
+3.3V REG
IC3050
+1.8V REG
IC702
+1.8V REG
38
38
IC901
D905
Q901
POWER
VOLTAGE
PROTECTION
CONTROLLER
D910
T902
TRANSFORMER (SUB)
D941
IC921
Q921
POWER
D922
PROTECTION
REG
D944
D942
D943
IC951
VOLTAGE
DETECT
PC902
PHOTO
COUPLER
POWER
Thermistor
F901
D901
AC IN
LINE
FILTER
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