3-11
MAIN PART
MAIN ELECTRICAL TROUBLESHOOTING GUIDE
No power on
by ADAPTOR
A
Replace ADAPTOR
NO
YES
1. POWER (DC-DC CONVERTER) CIRCUIT
Is ADAPTOR
out 9.5V
Replace D606
NO
NO
YES
YES
Is D606 OK.
Replace U202
Replace U401
Replace JK902
No +3.3V
No +5V
No LCD power
No +18V
YES
YES
Is U202
3.3V OK?
NO
Replace U401
Is U401
3.3V OK?
YES
No power on
by BATTERY
A
Replace BATTERY
NO
YES
Is
BATTERY OK?
YES
A
Содержание DP270B
Страница 15: ...3 6 MEMO ...
Страница 17: ...3 9 3 10 PRINTED CIRCUIT DIAGRAM TOP VIEW BOTTOM VIEW MEMO ...
Страница 28: ...3 21 FIG 3 3 FIG 3 4 F U401 PIN8 F U401 PIN8 FE U201 PIN26 FE U201 PIN26 RFL U201 PIN21 RFL U201 PIN21 ...
Страница 33: ...3 26 WIRING CONNECTION DIAGRAMS 1 WIRING CONNECTION DIAGRAM 1 MAIN PCB LCD PCB MAIN PCB MAIN PCB ...
Страница 34: ...3 27 2 WIRING CONNECTION DIAGRAM 2 MAIN PCB KEY PCB MAIN PCB Key PCB ...
Страница 51: ...3 55 3 56 1 MAIN P C BOARD TOP VIEW PRINTED CIRCUIT DIAGRAMS ...
Страница 52: ...3 57 3 58 MAIN P C BOARD BOTTOM VIEW ...
Страница 53: ...3 59 3 60 2 KEY MENU P C BOARD TOP VIEW BOTTOM VIEW 3 KEY FRONT P C BOARD TOP VIEW BOTTOM VIEW ...