Professor`
Moderate Fixer
Trying to locate a schematic for this unit, one channel is out, anything to help.
KR-8600 Help
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Professor`
Moderate Fixer
Ok i got the unit finally, the owner has poor eye site, i looked at it, turns out that it is a KR-6600
Last edited:
Professor`
Moderate Fixer
Here are 2 pics of what i got to play with ! i will show after in a few days.
Professor`
Moderate Fixer
Ok i got this unit cleaned up, i tested the output transistors, they tested good, but i still get no sound in the left channel, if i hooks speakers to the "B" terminal on the left side and switch the selector to B i get extremly low sound out of the left side, I have to almost turn it all the way up to hear it. Any ideas?
Professor`
Moderate Fixer
yes it has the jumpers like the sansuis do, i found on broken wire that goes to the chassis, i doubt thats the issue but iam soldering it now.
Professor`
Moderate Fixer
Could be QI 1 or 2 wich are transistors or a IC I1 as listed in the manual wich are all on the control board where the volume control are, both transistors check out, i do not no how to test the ic. wich is a upc1016c and the transistors are 2sc1345's
Professor`
Moderate Fixer
Left side dead.
Does the "Mono/Stereo" switch have any affect on the left channel? If so, the problem may be upstream of that in the FM detector, muting, or TAPE SOURCE and SELECTOR switches. If the MONO mode does not produce about equal volume from both channels the problem may be downstream, in the pre and final audio amp stages or speaker selector.
Professor`
Moderate Fixer
The switch dont seem to have a effect, i took them apart and cleaned them well, i know there in good working condition now.
Professor`
Moderate Fixer
I replaced 2, 2sc1345 transistors on the preamp board with no change, I ordered a new op amp ic, the upc1016c , if that dont solve the problem its time to break out the scope and dig deeper, i even swapped the power transistors from one side to another and its the same, i trippled checked and deoxed the switchs for source selections and speakers, it has to be that IC.
Professor`
Moderate Fixer
Of course, it would not power on if it was bad.
Professor`
Moderate Fixer
Ok, I replaced 2 transistors and the IC op amp as stated on the service manual for no sound on one side, its still the same, I do not know where else to look.
Professor`
Moderate Fixer
On the back of the receiver there is the 2 jumpers that cross the out and input , when i hook a sepperate amp to the outs both channels work so that part is ok, its something from there.
