3-11
ONE POINT REPAIR GUIDE
9. D(DC) PROTECTION
9-1. Solution
Replace IC702, IC703 (AMP IC) on MAIN board.
9-2. How to troubleshoot (Countermeasure)
1) Check DC voltage of speaker out FL_P/N, TWL_P/N (CN703 pin1, 2, 3, 4) and FR_P/N, TWR_P/N
(CN704 pin1, 2, 4, 5).
2) Check resistor crack, cold solder of PWM IC out (R710 ~ R717).
3) If PWM IC out is ok and speaker out (FL+/-, FR+/-, TWL+/-, TWR+/-) has DC voltage,
replace IC702, IC703 (AMP IC) on MAIN bottom board.
9-3. Service hint (Any picture / Remark)
< MAIN board top view >
< MAIN board bottom view >
CN703
CN703
CN704
CN704
IC701
IC701
(PWM IC)
(PWM IC)
R710 ~ R717
R710 ~ R717
IC703
IC703
IC702
IC702
Summary of Contents for SH4
Page 9: ...1 8 ...
Page 15: ...2 6 Figure 1 9 HOW TO DISASSEMBLE THE MAIN SET 9 Disassembly finish ...
Page 17: ...2 8 Figure 2 3 HOW TO DISASSEMBLE THE WOOFER 4 Disassembly finish ...
Page 21: ...2 14 ...
Page 36: ...3 15 2 FLASH MEMORY FIG 2 VCC CS CLK DO 4 5 6 7 6 7 5 4 VCC CS CLK DO ...
Page 38: ...3 17 4 USB FIG 4 1 5 V Voltage 12 FIG 4 2 USB D 13 FIG 4 3 USB D 14 12 14 13 ...
Page 40: ...3 19 6 OPTICAL FIG 6 1 OPT_IN 18 FIG 6 2 OPT_DET 19 19 18 ...
Page 53: ...3 42 3 41 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...
Page 55: ...3 46 3 45 ...
Page 62: ...4 7 4 AMP VOLTAGE FIG 4 2 AMP_12V FIG 4 1 AMP PVDD 10 11 11 10 ...
Page 63: ...4 8 5 PWM FIG 5 2 Woofer PWM SW Signal FIG 5 1 Woofer PWM SW Signal 12 13 13 12 ...
Page 64: ...4 9 6 LED FIG 6 2 Pairing On Status Green LED FIG 6 1 Pairing Off Status Red LED 14 15 15 14 ...
Page 65: ...4 10 ...