My Yamaha AV-Receiver RX-V1400 goes back in stand-by mode immediately after turning power on via the On/Std-by button. I managed to go into Diagnostic mode and get a "PS PRT:037" message on the display. According to the service manual, that indicates a Power Supply issue (not a main amp DC issue, different message). I needed to replace two Voltage stabilizer (5V, 12V) and now all voltages check out as per spec. Still the same error. I can go into Diagnostic mode and bypass the protection circuit: The amplifier works fine. The relay control circuit works fine. As this circuit is controlled by a CPU I have difficulties in identifying the root cause. Any suggestion?
If its controlled by a CPU then you need to reset it as you seem to have repaired it.
It sounds as though its locked up unless of course the protection circuit is faulty ?
Whats the reset code ?
It sounds as though its locked up unless of course the protection circuit is faulty ?
Whats the reset code ?
Thanks! I am not familiar with these Yamaha AVs, so I have a few questions: Do I need to attach a Monitor to get the reset code? Can I also do it with the unit's display? How do I reset the unit (the manual is not very clear about that)
Have you checked each and every voltage that it could be? Including voltage regulators lurking somewhere else? Having missed something seems way more likely to me than elephantine memory.
Yes I did. Being in Diagnostic mode it seems (according to the display) that (which?) voltage is fluctuating showing "PS😛RT XXX" where XXX is somewhat between 005 and 039. However, I can not see that while checking the individual voltages. I would expect a larger ripple than acceptable in order to generate this reading. I am trying to disable the protection circuit "sensor" line to the CPU to narrow in the faulty circuit, but somehow it seems I am running in circles. In diagnostic mode I checked all power amplifier channels attaching speakers and applying a music signal through the RCA connectors. All fine with one exception: I can not activate "Speaker B". (same circuit as Speaker A"). The respective relay does not work. Perhaps that is a clue?