W
Wayne Tiffany
Guest
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
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