
3-4
7. IC603 ABNORMAL
YES
YES
Check both end voltage of IC302 3.3V/6.2V
NO
Check or replace R601
NO
Check or replace X600
Check both end voltage of IC605(1.2V / 3.3V)
Check IC603 pin13, 47, 94, 120,
122, 124 (1.2V)
Check IC603 pin111, 112 X600 operation
YES
NO
Check IC602 Reset circuit
When power supply to IC603 pin107
(Low
→
High)
OK
YES
NO
NO
NO
NO
U302 3.3V output
normal ?
YES
OK
Replace ZD302
Check Q308 output
normal?
YES
Check
ZD302 normal?
YES
Check R308
YES
NO
Replace R308
OK
Check D301
YES
NO
Replace D301
Check R328
YES
NO
Replace R328
Check Q302 output
12V
YES
Check ECO-POWER
is “HIHGT”
YES
NO
NO
Check or replace
R305,R303,Q301
OK
Check F301
YES
NO
Replace F301
NO
Refer to SMPS
troubleshooting (12V)
OK
6. U302/3.3V ABNORMAL
Содержание SB74
Страница 9: ...2 3 2 4 ...
Страница 11: ...2 6 ...
Страница 25: ...3 14 WIRING DIAGRAM JK500 3P 13P CN501 CON2 2P SPK 2P 5P 8P 5P 3P CN580 24P 9P ...
Страница 26: ...3 15 BLOCK DIAGRAM ...
Страница 27: ...3 16 ...
Страница 34: ...PRINTED CIRCUIT BOARD DIARGAMS 1 1 MAIN P C BOARD DIAGRAM TOP VIEW 3 29 3 30 ...
Страница 35: ...1 2 MAIN P C BOARD DIAGRAM BOTTOM VIEW 3 31 3 32 ...
Страница 37: ...3 1 MCU9800 P C BOARD DIAGRAM TOP VIEW 3 35 3 36 ...
Страница 38: ...3 2 MCU9800 P C BOARD DIAGRAM BOTTOM VIEW 3 37 3 38 ...
Страница 39: ...4 FRONT P C BOARD DIAGRAM 5 CD JACK P C BOARD DIAGRAM 3 39 3 40 ...