Recent content by tonygvng

I took everything apart and cleaned the boards with isopropyl alcohol, removed most of the corrosion on the ICs but it still does not work. The front panel pcb smells a lot like burnt FR4 but all the components look fine and nothing is shorted. Tried also plugging it to main power with the front...

Checked the power supply : +17v line sits at around 15.2v, 2.5v AC is 3.6v and the 4.3v AC is around 3.7v but randomly jumps. All the other lines are normal.

Hello, i got my hands on an Harman Kardon AVR 158 and wanted some help with troubleshooting it. Few years ago it was working perfectly and now it doesn't: - When plugged to power the led turns orange and after a few seconds it becomes white, turning on by itself; -The display and the led ring...

the temperature was measured on the steel casing under the transformer with the lid closed

Hello again, another question, i noticed that the amp transformer gets pretty hot after like 30 minutes at 1/3 of the volume , around 50°C/122°F. is it normal or should i worry about it? thanks.

UPDATE: looked at the service manual, cleaned the pots, resoldered a disconnected wire and everything works fine. Thanks for everything.

i am in Italy but thanks anyway for the offer

the balance is in the center, turned all to the left it plays on the broken channel at like -80dB even if i crank up the volume to the max

It was my grandfather's so i will get it repaired, but thanks anyway.

it was stored in perfect conditions and i powered it for the first time since 2005/2008 but thanks for answering.

Hello, i recently got an Harman Kardon PM635 UWB dual system amp and no matter what the left channel doesn't work: tried plugging the source in tape, cd, tuner and no luck, the left channel doesn't work neither on the headphone jack or the speakers (both system 1 and 2). Any suggestions? Thanks...