
3-6
11. U503 ABNORMAL
YES
Refer to power circuit troubleshooting
Check the power supply to U503 pin24
NO
YES
Check JK601 pin47, 48 Vol_CLK/Vol_Data
Check the SCL/SDA data of U503 pin25, 26
NO
YES
Check or replace U503
Check the control function
NO
OK
12. U501 ABNORMAL
NO
YES
Refer to power supply
U302 3.3V
LCD display check
Check the power
supply to U501 pin7
YES
NO
Check MICOM U603 pin71
CS, pin72 DAT, pin73 WR
Check U501 pin1 CS
pin3 WR, pin4 data
YES
NO
Replace MICOM
YES
OK
13. U101 FM TUNER MODULE
YES
Check Q305 B “High”
Check the power supply of U101 pin3
NO
YES
Check JK600 pin24, 26
Check TU-SCL, TU-SDA
NO
YES
OK
Check the operation
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 ...