Turned unit over to a guy to fix it sometime ago and he keeps trying. He thought it was the power amp module as well but could only find replacements at $80 each, so he tried removing one side, and replacing it with the center module, trying to sort which might be bad. So far no improvement. He is now tracing signal thru the thing,
Any idea where to get replacement power amp modules for less than $80 each? If I have to replace all three sending it to a landfill might make more sense. Any response will be appreciated.
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Re: Power Amp Module
There may be more reasonable prices around but you will need to post the type number of the module.
Unless it is a proprietary part number, it should have 2-3 letters, then several numbers following and perhaps another letter.
These units seem to have more problems than others in their class and they may have inadequate output protection.
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The protection mode has activated. Reset the protection mode as follows and see what happens.
Connect power cord to mains and wait 5 seconds or so. While holding down "info" and "tone control" buttons, press "main zone" power button briefly and release, but keep "info" and "tone control" buttons pressed for at least 3 more seconds. The unit should power up. Assuming the reason for the protection has passed or been fixed, the unit can now be turned off and then back on with the "main zone" power button to restore normal operation mode. If the protector activates again, the fault is still present and the unit needs to be repaired, ideally by a Yamaha authorised repairer. There are dangerous voltages present in high power amps and a lot of grunt in terms of stored energy - best left to trained technicians.
The power amp IC for this is an SVI3206 which is listed as no longer available. You can check with some local service shops that may have some in stock. Realize that this IC is not cheap ($75 or more if available). If the relay does no click, there is a god chance that the IC is defective. I have seen some cases where there was a problem with the voltage regulator circuit that was preventing the amp section from working properly. Without seeing the actual unit and testing it, I can't say for sure.
the protection circuit is your amp is turned on by itself or its protecting your speakers from burnt output transistor stage of amplifire circuit.sometimes it happense because of bad solder joints of the printed circuit board.if you are technicaly sound please resolder all the joint of pcb power and putput sections.if you need more help please comeback.
try to do it by yourself.
Same problem. C901 on the vertically-mounted input board next to the power supply transformer was burned. Replaced with ceramic cap from RS with same specs. Still did not work. Talked to Jeb, great guy at HK tech support. He suggested that R901 would probably be blown and maybe 902 also. These are flame-proof resistors and do not show damage. Tested with multimeter and Jeb was spot on. Replaced 1w resistors with 5w (all RS had) at same resistance. Works great.
I had the same problem. As soon as the volume reached about 24db it would go into overload. I was able to fix it by soldering all the connections on the larger power module. The one connected the the heat sink. When I took it apart there where several solder points that had come loose.