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2325 switching problem

HF-89

HF-89

New Member
I have read through the threads covering the various causes of one or both channels functioning improperly and have not found a suitable solution to my 2325's problem.
The situation is this:
1. Both channels perform properly with FM source selected in the Dolby FM position only.
2. With Dolby selector off, I get one channel in all modes.
3. When I use an external Preamp, both channels are loud and clear.

I take it this is common with these receivers. Maybe someone more experienced than I with this unit can help diagnose/fix the problem.
Thanks for any constructive input you may have...
 
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Sounds like a defective/dirty Dolby switch. Another possibility is a defective component in the Dolby circuit.
You can check the switch(s) with a DMM. Use the continuity setting or any resistance setting on the DMM for this test. Power off, of course.:D

Ron
 
Have you tried jumping the pre out to a known good amp to see if the problem may be in the preamp section.
I have had a couple of 2325's with defective audio IC's on the preamp / tone board.
 
The Dolby circuit is looking like the culprit. I connected the pre-out to another amp and found that all preamp functions are operable. The FM Dolby circuit works in all positions on FM with the external amp. I guess this narrows it down a bit. I am wondering why the Dolby switch is in the signal path when it is out of use? Looks like a poor design to me. Thanks for the above responses...
 
HF-89 said:
The Dolby circuit is looking like the culprit. I connected the pre-out to another amp and found that all preamp functions are operable. The FM Dolby circuit works in all positions on FM with the external amp. I guess this narrows it down a bit. I am wondering why the Dolby switch is in the signal path when it is out of use? Looks like a poor design to me. Thanks for the above responses...
Click to expand...

A look at the service manual would tell you but I'd say its redirecting the signal to bypass the dolby section when its in the off position.
 
There could be a problem with the self bridging pre out / main in jacks, since you state that the audio is good patching from pre out to a known good amp, and conversely patching from a good preamp into the main in jacks.
Try installing a set of patch cords to the pre out main in jacks.
 
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