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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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Marantz 1070 repair
I'd lean towards coupling capacitors, or the differential pair of pre-amp
type transistors at the amp input stage. A can of freeze - mist might help narrow it down. I'm trying to remember - there was a particular type of transistor or two they had problems with back in those days. I think it was 2SD458, or maybe 2SC1312. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. wrote in message om... I've recently acquired one of these amps and it has almost been working.. It will often go for a few minutes and then the protection relay will cut out, although sometimes it doesn't cut in to start with. I have traced it through to the protection circuit kicking in due to DC being present on the output of the left channel. Haven't been able to trace it further than that yet... When it does work, it sounds fine. Any clues on where to start? |
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Marantz 1070 repair
One other component to check is a glass diode on the power amp board.
These would fail fairly often and the symptom was D. C. offset. Chuck On Tue, 27 Jul 2004 05:27:59 -0500, "Mark D. Zacharias" wrote: I'd lean towards coupling capacitors, or the differential pair of pre-amp type transistors at the amp input stage. A can of freeze - mist might help narrow it down. I'm trying to remember - there was a particular type of transistor or two they had problems with back in those days. I think it was 2SD458, or maybe 2SC1312. Mark Z. |
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