3-8
ONE POINT REPAIR GUIDE
7. IF THERE IS NO SOUND.
7-1. IC304 (NO PWM_3.3V)
7-1-1. Solution
Replace IC304 on MAIN board.
7-1-2. How to troubleshoot (Countermeasure)
1) Please, check PWM_3.3V of L307 of IC304 pin6 (VOUT).
2) If PWM_3.3V is abnormal, check 3.3VA pin1 (VIN).
3) If 3.3 VA is OK, please replace IC304.
If R334 is not high state, follow the stage 9-1 (IC100).
7-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC304
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