SONY ZX66i No Sound ... confused

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  • repair-it
    Senior Member
    • Nov 2020
    • 116
    • US
    #1

    SONY ZX66i No Sound ... confused

    Need help from Audio Expert troubleshooting a no sound fault (everything else works) SonyZX66i https://www.manualslib.com/manual/15...page=57#manual

    I replaced the STK 412-150 chip. I have no voltage on ic pin 16 (bias) & no negative voltage on pin 12 which is probably why the bias is 0. I checked the voltages on Q610 and have 71v on both base & emitter but 0v on the collector.

    I'm not sure where the missing negative voltage on the collector should come from. Does it mean that the transistor Q610 is bad?
    Last edited by repair-it; 03-11-2023, 10:43 PM.
    Tags: None
    • R_J
      Badcaps Legend
      • Jun 2012
      • 9588
      • Canada
      #2
      Re: SONY ZX66i No Sound ... confused

      Is the base voltage on Q610 around .7v lower than the emitter? if not, check the Mute control circuit Q606, Q604

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