Question about Yamaha DSP-A1 Receiver

Amp powers off after switching on

This is an intermittent problem that has gradually got worse! After powering on the amp after about 2 seconds the full amp is powered (a noticeable click) then it shuts itself off! It did this sometimes during a movie and I put it down to current fluctuation. Then the phase of powering down after switching on started. It's now connected to a UPS, all the speaker and other cables have been checked and double checked for possible shorts (in fact the same fault occurs with nothing connected). Then some days (after 30 mins switching on and off) it will work without fail until switched back off. Any ideas?

3 Answers

markpt1

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2 Answers

The last click you hear before the amp turns on is the power relays for the amp circuit,these have 2 very small copper contacts inside them which after much time get corroded and cause high resistance when they try to power up the amplifier circuit.awkward to get to and desolder but can be opened up and serviced,done mine and a few friends with yamaha amps which use similar system,had no problem since,also worth checking for dry joints around amp chip i.c legs onto main board.

Posted on May 02, 2008

Anonymous

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The DSP-A1 has an internal self diagnostic program which you can access from the front panel. The service manual shows how to do it and what the readout codes mean as far as the fault that caused the trip. Service manuals are cheap and readily available on the web.

Posted on Jan 20, 2008

Anonymous

My DSP-A1 is doing the same thing. The unit's internal circuit breaker is tripping. That's the click you hear. Mine was intermittent and I sent if over to the local Yamaha authorized service in Portland, OR for repair. If anything they made it worse. Now the unit is basically unusable. They kept the unit for 4 months and finally came back with a long list of items they think it needed (at $650+). I don't have any confidence that they knew what they were doing. I have heard some good things about Yamaha's west coast service (TAP Electronics) in Buena park, CA and may send it there. Otherwise it becomes a boat anchor or Goodwill donation I guess. Please let me know if you solved your problem and what it was. Thanks.

Posted on Jan 16, 2008

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Sounds like you like your music like me... LOUD. If you've done this a number of times, there are a few things that can happen:

1. You've blown the speakers... but you've said it operates for 2 seconds, then cuts out.
2. You've damaged the amplifier modules within the amp and they immediately overheat upon power-up. Does the music come back like 5 or 10 seconds after the unit cuts out?
3. Thermal switch has malfunctioned and just cuts off the power to the amplifier modules as soon as it sees any heat.
4. If you've gotten the amp really HOT during playing, it's possible that it's as simple as the amp modules are only intermittently connected (fatigued/stressed or cold solder joints) at the on the PCB. Just resolder the connections of the amp module to the PCB. I've seen that happen numerous times and that's where I'd place my money.

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