robotype
Member
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The sound from the MPU is completely silent. sound check at startup 1 tone but If I press test switch SW1 nothing happens. I already replaced U9 (6821P) and replaced the 55536 at U3 with a 55564 (from high speed) but didn't help. voltage (-12) is -13.6, could this be the cause? sound board is good and plays ok. any idea? on pinrepair I can't find any other clue.
The sound from the MPU is completely silent. sound check at startup 1 tone but If I press test switch SW1 nothing happens. I already replaced U9 (6821P) and replaced the 55536 at U3 with a 55564 (from high speed) but didn't help. voltage (-12) is -13.6, could this be the cause? sound board is good and plays ok. any idea? on pinrepair I can't find any other clue.