Question about Aiwa Audio Players & Recorders
Aiwa mx 70 Amp powers on, no blown outputs, the speaker relay won't come on. Problem got worse from leaving the unit on for a minute, to 5 minutes or longer before the relay kicks in to now it doesn't kick in at all.
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Posted on Jan 02, 2017
SOURCE: Power on problem
Time for a little repair here. It seems that one or more channels have developed an excessive drain on the supply, and has caused the threshold to trip and shut you down. It's more than likely shop time at this point....accordianman
Posted on Oct 25, 2007
Without looking at the schematics for this particular model, I'd surmise that the click is indeed a speaker protection relay. Generally this is fed by a number of different sense circuits that watch for power amp issues and/or excess speaker current and/or power supply output stability. Although the relays do indeed fail at times, generally it is not the relay that is at fault. If you have a scope and a schematic, you can check the various circuits that feed the relay for the exact cause. If not, you can do some experiments that might help deduce the problem: e.g. do headphones work when speakers do not, does the relay click on when no speakers are connected (or selected), etc. In my experience, it is most often the output transistor(s) in the power amp. But not always ;-)
Posted on Oct 15, 2008
SOURCE: My bose car stereo system
The problem is in the power amplifier section. If you a preamp out connector you can troubleshoot using another power amp between that and the speakers but you may need a schematic to isolate to the components at fault. Bose is worth fixing and if you can remove it yourself you will save money by getting it to a bench technician, even a TV repair shop can fix it. Steve Medley
Posted on Nov 08, 2008
SOURCE: no audio output - Marantz 2238
This can be as simple as a poor connection somwhere in the voltage regulator circuit or a defective driver transistor or output transistor. In any case, this is a simple repair for any shop that works on vintage receivers. If it is the outputs, that will be the most expensive repair from a parts perspective. The outputs will cost in the $5-$10 range for each one and it could be 2-4 pieces. If you wish to attempt this repair yourself, you will need a multimeter that has a diode checker. Let me know and I'll provide additional details and instructions.
Posted on Apr 06, 2009
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