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Intermittent audio from speakers

ascimad

May 5, 2018
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May 5, 2018
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I have an old JVC RX-250 receiver that has no audio at times. I took the cover off the unit and found that tapping on a relay caused the audio to turn on and off. I am unable to find a schematic diagram for this model online so I am not sure how to troubleshoot this problem. I have experience in electronics but not a strong background in troubleshooting at component level. can anybody let me know if there is anything else I can check or can someone let me know if I can get a schematic diagram for this model that I can reference?
 

WHONOES

May 20, 2017
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1,217
Sounds as if the relay contacts a little burnt. If you can get the cover off then, you could clean them with a very fine abrasive paper. If not then you'll probably have to replace it.
 

ascimad

May 5, 2018
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May 5, 2018
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Thank you, I will give that a try, but if I need to replace it would I be able to get a replacement part being this unit is over 20 years old?
 

WHONOES

May 20, 2017
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Unlikely unless it is a very common part. Have a look on the case, it may have a part number that could be traceable. If not you will have to find a suitable replacement that could be hard wired in.
 

KJ6EAD

Aug 13, 2011
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Aug 13, 2011
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1,114
Check for bad solder joints on the relay or even reflow them regardless of apparent condition.
 

ascimad

May 5, 2018
4
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May 5, 2018
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Unlikely unless it is a very common part. Have a look on the case, it may have a part number that could be traceable. If not you will have to find a suitable replacement that could be hard wired in.

Thank you for your help.
 

Externet

Aug 24, 2009
891
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Aug 24, 2009
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And also probe the speaker terminals for DC presence at low volume when happens to work.
If there is DC; the relay is acting properly disconnecting the speakers as there is a fault.
 
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