Kenwood KR-4600 receiver -- protection circuit?

[bangsezmax]

Hi all --
I just picked up a freebie KR-4600 receiver. Very, very low output on all functions, sounds like I'm just getting some pre-amp bleedthrough or something.

Do these units have a protection circuit? I found a schematic. It's at http://www.fotoalbumet.com/u/00/24/40/files/Manuals/KR-4600_2.PNG. Didn't want to imbed it in the post because it's huge.

It appears that there may be variations in the circuits on this unit.

Anything else I should check besides protection (I did check fuses already)?

Thanks!

 

[Bob91343]

The protection circuit wouldn't cause this symptom. I would clean all the switches and then trace the signal with an oscilloscope if it still didn't work.

 

[bangsezmax]

The protection circuit wouldn't cause this symptom. I would clean all the switches and then trace the signal with an oscilloscope if it still didn't work.

I've sprayed the switches and pots. And I have no scope. :worried:

 

[sregor]

Eliminate all the stupid things. No shorting plugs in tape out jacks. The Speaker switch is one of the in series type, so you'll get no sound in the A+B position unless there are speakers on both. ALso - try it with head phones, and different sources (besides tuner) Do you have a cassette deck - see if meters read in record mode. Fuses seem to be the only protection circuit - Visible inspection of PCB's may reveal something. Good luck.

 

[bangsezmax]

Okay, put this one in the "stupid things" category. On these Kenwoods (which I have very little experience with) the jacks marked "Adapter" are actually the preamp-to-amp jacks. The jumpers that are supposed to be there are AWOL on my unit. Couple RCA cables fixed that.

Learn new stuff all the time with this hobby.

 

[sregor]

:thmbsp: