3-5
ONE POINT REPAIR GUIDE
3. NO SOUND (PORTABLE FUNCTION)
3-1. Solution
Replace IC508 or portable jack (JK854).
3-2. How to troubleshoot (Countermeasure)
1) Please check the soldering status of portable jack (JK854).
2) Please check L854, L855 (portable L/R signal) of portable jack (JK854).
If you can’t find input signal, replace JK854.
3) If you can find input signal, check pin13, 14 of IC508.
4) If you can’t find signal at pin13, 14 of IC508, replace IC508.
3-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK854
JK854
IC508
IC508
L855
L855
L854
L854
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 ...