3-12
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Only for training and service purposes.
ONE POINT REPAIR GUIDE
PRIMARY UNIT
PROTECTION ERROR
3-2. S(SHUT DOWN) PROTECTION
3-2-1. Solution
Replace MAIN board.
3-2-2. How to troubleshoot (Countermeasure)
1) Check PVDD voltage (25 V) of IC701 pin29, 30, 31, 36, 37, 38.
- If PVDD voltage has 8.5 V under, refer to STEP 1-1.
2) Check GVDD, VDD voltage (12 V) of IC701 pin1, 2.
- If GVDD, VDD voltage has 8.5 V under, refer to STEP 1-1.)
3) Check impedance (8 Ω) of speaker unit.
- If impedance of speaker unit has 2 Ω under, replace speaker unit.
4) If check point 1), 2), 3) is ok MAIN board.
3-2-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
IC701
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