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ONE POINT REPAIR GUIDE
23. S(SHUT DOWN) PROTECTION
23-1. S PROTECTION
23-1-1. Solution
Replace IC700, IC701 (AMP IC) on MAIN board.
23-1-2. How to troubleshoot (Countermeasure)
1) Check PVDD voltage (25 V) of L303.
- If PVDD voltage has 8.5 V under, follow the stage 1-1.
2) Check GVDD, VDD voltage (12 V) of IC700, IC701 pin1, 2.
- If GVDD, VDD voltage has 8.5 V under, follow the stage 1-1.
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 IC700, IC701 (AMP IC) on MAIN bottom board.
23-1-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
IC701
IC700
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