Chosen Solution
After a power outage my receiver won’t turn on. It shows “Thermal Error” in the display for a few seconds and then turns off again. My guess is it was a voltage peak when the power got back on that killed it.I tried contacting Pioneer, but they just told me to contact a service shop. That will probably cost more than it is worth so I will not do that, but still it will be a shame to have to throw away a 5 year old receiver if it easily can be fixed…I tried searching for the schematics for it, but I had no luck. Does anyone here know what this error is and how to fix it?I live in Norway btw so it is rated for 240V if that makes a difference. Update (10/06/2022)
Update (10/07/2022)
Hi @mikaels Do you have a decent DMM (digital multimeter)? One that can measure resistance (Ω), voltage and a diode mode (look for a symbol of an arrow with a line on the “pointy end” of the arrow.) I can suggest watching 12voltvids on YouTube, he is a great guy and has a LOT of videos, also on diagnosing some audio equipment. The surge that happened as a result of the power outage, blew something inside the receiver, and you’ll need to replace that (or those) part(s). Most likely some capacitors (the only obvious way to detect that, without an ESR meter, is to look at the top of the electrolytic capacitors to see if it’s blown), and quite possibly one or more mosfets in there. You need to measure the mosfets for shorts. NOTE!!! Some of the capacitors in the power part of the receiver are capable of holding hundreds of volts with fairly high farad ratings, which are DANGEROUS! Never touch the leads of the capacitors without making 110% sure that they are completely discharged! A multimeter can read the voltage contained in the capacitor, in the Voltage reading mode. PS! I’m also a Norwegian ;) Edit:
See if you find this setup on your board. Red are the regulators and Blue are the corresponding inductors.
Try a microprocessor reset:. While holding down AUTO/DIRECT on the front panel of the receiver, press STANDBY/ON on the main unit. “Clear” appears on the display and the unit returns to standby. After “Clear” disappears from the display, unplug the power cord for a few minutes.
