3-12
ONE POINT REPAIR GUIDE
10. S(SHUT DOWN) PROTECTION
10-1. Solution
Replace IC702, IC703 (AMP IC) on MAIN board.
10-2. How to troubleshoot (Countermeasure)
1) Check PVDD voltage (24 V) of FB607.
- If PVDD voltage has 8.5 V under, refer to NO POWER PROBLEM guide. (STEP 1-1.)
2) Check GVDD, VDD voltage (12 V) of IC702, IC703 pin1, 2.
- If GVDD, VDD voltage has 8.5 V under, refer to 12 V no power repair guide. (STEP 2-1.)
3) Check impedance (4
Ω
) of speaker unit.
- If impedance of speaker unit has 1
Ω
under, replace speaker unit.
4) If check point 1), 2), 3) is ok, replace IC702, IC703 (AMP IC) on MAIN bottom board.
10-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
IC703
IC703
IC702
IC702
Содержание SH4
Страница 9: ...1 8 ...
Страница 15: ...2 6 Figure 1 9 HOW TO DISASSEMBLE THE MAIN SET 9 Disassembly finish ...
Страница 17: ...2 8 Figure 2 3 HOW TO DISASSEMBLE THE WOOFER 4 Disassembly finish ...
Страница 21: ...2 14 ...
Страница 36: ...3 15 2 FLASH MEMORY FIG 2 VCC CS CLK DO 4 5 6 7 6 7 5 4 VCC CS CLK DO ...
Страница 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 ...
Страница 40: ...3 19 6 OPTICAL FIG 6 1 OPT_IN 18 FIG 6 2 OPT_DET 19 19 18 ...
Страница 53: ...3 42 3 41 PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...
Страница 54: ...3 44 3 43 2 FRONT P C BOARD DIAGRAM 3 KEY P C BOARD DIAGRAM TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...
Страница 55: ...3 46 3 45 ...
Страница 62: ...4 7 4 AMP VOLTAGE FIG 4 2 AMP_12V FIG 4 1 AMP PVDD 10 11 11 10 ...
Страница 63: ...4 8 5 PWM FIG 5 2 Woofer PWM SW Signal FIG 5 1 Woofer PWM SW Signal 12 13 13 12 ...
Страница 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 ...
Страница 65: ...4 10 ...