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My Yamaha M60 amplifier is not working

The protection indicator light stays on and I am getting no sound. I love this amplifier and have had many years of great tunes. Any thoughts on how to fix it?

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The most common cause of this is a failure of the output transistors. These amps are not the easiest for access during repair. I would not suggest you attempt this repair if you have no experience working on these. The output transistors and some additional parts in the same circuit are likely to require replacement. Figure on about $50-$70 for parts. Add in the local labor rate for the total repair cost. This is a good unit and is worth the repair cost. You will get many additional years of performance out of it once repaired. Dan

Posted on Jun 15, 2009

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Dan - Can you recommend where to purchase parts for this amplifier and also, if they are the utput transistors can you tell me the most common failed components in this circuit?

Thanks,
Greg

Posted on Dec 30, 2009

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1 Answer

No sound coming out on any channel


I would also guess you have a flashing indicator, correct? If you do, your amplifier has DC Offset(a damaged amplifier). If this is the case, the protection circuit will not allow audio on any channel.
If you are interested in having your Yamaha repaired, please look at my website, audioserviceclinic.com. You may contact me there. Thank you.

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The protection light is on indicating a short or over- voltage problem. If you disconnect the speaker leads and the light goes off or green then the problem is a shorted speaker or wiring problem. If the light stays red the problem is inside the amp and it will need service and parts.

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Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

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GOOD LUCK
BIG RED

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1 Answer

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http://www.avsforum.com/avs-vb/showthread.php?t=885511

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