Question about Yamaha Audio Players & Recorders
I have a Yamaha RX-v420 surround reciever that will not turn on. I checked the voltage across the small trans former on the power board (which I assume is the standby power feed) and on the side with two terminals I could only read 0.5 volts accross them. Is this within spec? if not what should I check next? I have already checked the fuses.
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Posted on Jan 02, 2017
SOURCE: Yamaha RX-V420 No power
If the standby voltage exists, the next step is to see whether or not the clock is working. Find the main micro chip. There should be a 3 legged crystal close by. You should see this oscillate (use a scope). No oscillation = no micro control = no turn on. It is possible that the micro is bad or the crysal is bad. Also, check to be sure that the output transistors are not shorted. It is also possible that these are preventing the system from turning on.
Posted on May 12, 2008
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