SONY ZX66i No Sound ... confused

repair-it

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Join Date: Nov 2020

Posts: 116

Country: US
#1

SONY ZX66i No Sound ... confused

03-11-2023, 10:35 PM

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.
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R_J

Badcaps Legend

Join Date: Jun 2012

Posts: 9633

Country: Canada
#2

03-12-2023, 12:33 PM

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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SONY ZX66i No Sound ... confused

SONY ZX66i No Sound ... confused

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