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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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Question about Toshiba receiver SA-7100
Hi all - I have a real nice late 70s era Toshiba receiver that has a
problem. It started out with a noisy right channel, sort of a crackling sound every so often (all inputs and thru the headphones as well). I took the cover off and tapped the output transistors with a pen, and discovered that it made the sound worse and then eventually the sound went away. The unit worked fine for about a week, then it made a large POP and now it has no output (in either channel). In fact, it never really comes on all the way. What I mean by that is, the "click" you usually hear after a few seconds when turning it on never happens now. I checked all the fuses inside by the way. Everything lights up as usual, so it appears to be getting power. Is it likely the transistors finally shorted or otherwise gave up? Any ideas are appreciated. I'd like to get it working again, I love the sound of this unit. Thanks. Perry |
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Question about Toshiba receiver SA-7100
Perry wrote in
: Hi all - I have a real nice late 70s era Toshiba receiver that has a problem. It started out with a noisy right channel, sort of a crackling sound every so often (all inputs and thru the headphones as well). I took the cover off and tapped the output transistors with a pen, and discovered that it made the sound worse and then eventually the sound went away. The unit worked fine for about a week, then it made a large POP and now it has no output (in either channel). In fact, it never really comes on all the way. What I mean by that is, the "click" you usually hear after a few seconds when turning it on never happens now. I checked all the fuses inside by the way. Everything lights up as usual, so it appears to be getting power. Is it likely the transistors finally shorted or otherwise gave up? Any ideas are appreciated. I'd like to get it working again, I love the sound of this unit. Thanks. Perry It sounds as if you had some dry joints in the output stage. Tapping the transistors didn't help one bit, and now it appears that the protection relay is keeping the output stage turned off to protect the speakers. You'll need to check for obvious DJs first, then decide whether you've shagged the output stage. |
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