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Pioneer QX 949 Quad Reciever NO AUDIO

John Killian

John Killian

New Member
Calling all veteran audiophiles
Looking for any and all repair advice you may be interested in passing off.

I just purchased this Pioneer 949 from a local seller under the notion that the unit powered on, but audio was out and no longer working.
For $50 I felt like I couldn't afford NOT to grab it. Parts alone are worth plenty more than that.
Upon researching this is supposedly one of the hardest units to work on and in the end decided it may be better for someone a bit more knowledgable on the subject tamper with the real guts of the machine.
Any troubleshooting recommendations or possible Hail Mary attempts I should take first before seeking a specialist?

Same day I purchased a pair of Pioneer HPM100s & a pair of the Pioneer HPM40s, which I'll be posting another thread about. Any advice there is appreciated as well!

Also if anyone is local to Norfolk VA and would be interested in guiding me through the repair for compensation that would be incredible.
 

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If upon power up the lights come on and you hear the faint click of a relay closing, you likely can get at least some audio to come out of it. The problem is probably dirty and/or corroded controls. Try exercising all the knobs multiple times back and forth across their full range and do the same thing with the push buttons. Make sure the tape monitor push buttons are in monitor position. Also make sure the four small knobs surrounding the scope on the left are turned fully to the right. Keep looking for a pro or accomplished hobbyist in your area for additional help. This model is not a good place to start for a novice. Please report back with any progress.
 
Welcome to A.k.
If no lights or clicks then inspect for fuses.
If you're going to get into vintage gear you ought to build a Dim Bulb Tester.
adimbulbtester.jpg
 
i just finished on of these and returned it to its owner.

there are a few transistors on the 'top ten most wanted' that you might need to look at.

build a DBT per binkman
search the pioneer mfg sub forum for qx949 repair ideas. there are a few threads from others that have worked on them in the past. It helped me. I had a qx949a (not sure if it matters).

I really hate working on quad receivers. there is a lot of boards to check and fix. Plus they are kind of heavy.

Good luck!
 
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