Question about Yamaha DSP-A1000 5-Channel Amplifier

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Yamaha Laserdisc Karaoke CDV-1200K NO POWER

I have an old, classic Yamaha Laserdisc with Karaoke function built in, model CDV-1200K which just given to me by a friend for collection. However, there's no power indications or whatsoever, none of the LEDs lid up.... I did make sure it's switched to 120V (120V or 220V selector). I did attempt to open up the case but couldn't couldn't verify whether the power transformer is still alive or not as I don't have the schematic diagram. There're 4 wires going from the transformer to the power distribution circuitry; which I believe 2 of them for DC stepped down power and 2 for close-loop or some other signalings....but I have no way of verifying the power source... does anybody have any clues ? Please help............... Thanks and much appreciate upfront.

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5 Suggested Answers

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SOURCE: standby power switch

If you are concerned about humidity and switches, spray them with DeOxit. You can get it at Radio Shack.

Posted on Jul 14, 2007

  • 236 Answers

SOURCE: protection of yamaha pc 2002

time delay... i dont know...seems unusual. the protection system of all yamaha PA and A/V is driven at teh same time not discrete so i dont understand why 1will be active earlier and the other delayed. in any case, a delay in relay activation is unstable center violtage or you are having an abnormal output stage, it is prducing more than 0.1 volts DC. this is primarily caused by unbalanced biased input initial stage of the main amp, voltage stability is not accurate. Or grounding getting poor.


Posted on Mar 19, 2008

  • 85 Answers

SOURCE: where i could find the

A common problem on these amps ie no sound is due to dirty switches and tone contols,amp face needs taking off and contact cleaner needs spraying into all controls...

Posted on Jan 15, 2009

  • 169 Answers

SOURCE: need schematic diagram of YAMAHA P7000S

Best find your local dealer as cd are not usually supplied to end users.

Posted on Sep 20, 2009

  • 1175 Answers

SOURCE: Yamaha Amp DSP A-3090 Power/function/Remote

These issues can only be fixed by an audio-tech.

Do a websearch around your area for a repair person

Posted on Nov 04, 2009

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Turn the power amplifiers off first and on last. Your problem will go away.

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Can you post the model number please. I have some Yamaha service info, but each model is different.


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These issues can only be fixed by an audio-tech.

Do a websearch around your area for a repair person

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Peavey classic 30, new tubes and PT with absolutely no sound

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Please update this with what you mean by "PT" and we'll continue from there.


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Yamaha P4500 service manual

one thing for sure Yamaha will not turn their back on their customers for support. What they normally say is that you contact your nearest service center for assistance. But you know you have a very good chance of getting a copy of the service manual since this is a very old model. i have the same amp being used in our church and yamaha service Japan has sent me by postal mail. technology nowadays is much different so maybe they can even send you in pdf format.

Write them by postal mail :
Yamaha Corporation
A/V PA Service Department
10-1, Nakazawa-cho, Hamamatsu, 430-8650 Japan.

simply tell them you need the manual and you are doing the servicing on your own. No one in your area can help you with it.

anyway, what is wrong with your P4500, it's a good amp but sensitive. very good design, hard to troubleshoot if you're not familiar with Yamaha amps. The main parts you can not replace buying from a local store though you may get the same part numbers specially power/driver transistors. it always comes in complementary pair critically matched by tthe factory. i tell you don't get the replacement anywere but Yamaha only. Yamaha have made to order power transistors tailor made for this Amp. you'll find the same transistor number outside but when you plug the unit, it wont last and worst it bursts !!! be carefull. Very hard to scan a copy of manual for you, but if you dont get a reply from Japan you can email me and we'll try to find a way to send you a soft copy.

Reden (
Yamaha service from Saudi Arabia 1996-2001

Jan 28, 2008 | Yamaha P4500 Power Amplifier 2-Channel

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