Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Sherwood S-8300Cp receiver help

I have posted a copy of the schematic at
http://www.kcswug.com/images/\Sherwood S-8300Cp receiver schematic.pdf for
anyone that is interesting in offering an opinion.

I agreed to look at this receiver for friends of ours. Short version - she
said it didn't work. I said to check fuses, she did and found the external
speaker fuses blown. Replacing them didn't fix the problem.

Ok, I opened it and found that Q710R, one of the main outputs is shorted.
And Q706R & Q704R are both missing part of their housing, as in probably
exploded out due to overcurrent.

My question is this. Based on your experience, what else should I be
checking? I ask because I hate to miss changing something due to lack of
experience, but I also hate to just shotgun everything in that output area.
I figured that I should probably replace all 4 of the outputs even though
they are not shorted. I will check ESR on the electrolytics. What about
the transistors 708 & 709 feeding the outputs? Thoughts?

Thanks.

Oh, for those interested, on that web site I also have pictures of an old
stand-up radio that I acquired. At this point it's in my garage, but
hopefully some day I will have the time to restore it.

WT


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Default Sherwood S-8300Cp receiver help


"Wayne Tiffany" wrote in message
...
I have posted a copy of the schematic at
http://www.kcswug.com/images/\Sherwood S-8300Cp receiver schematic.pdf for
anyone that is interesting in offering an opinion.

I agreed to look at this receiver for friends of ours. Short version -
she said it didn't work. I said to check fuses, she did and found the
external speaker fuses blown. Replacing them didn't fix the problem.

Ok, I opened it and found that Q710R, one of the main outputs is shorted.
And Q706R & Q704R are both missing part of their housing, as in probably
exploded out due to overcurrent.

My question is this. Based on your experience, what else should I be
checking? I ask because I hate to miss changing something due to lack of
experience, but I also hate to just shotgun everything in that output
area. I figured that I should probably replace all 4 of the outputs even
though they are not shorted. I will check ESR on the electrolytics. What
about the transistors 708 & 709 feeding the outputs? Thoughts?

Thanks.

Oh, for those interested, on that web site I also have pictures of an old
stand-up radio that I acquired. At this point it's in my garage, but
hopefully some day I will have the time to restore it.

WT

I finally have time to try to work on this again over the weekend - anyone
have suggestions for me? Thanks for your time.

WT


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