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Help t-shooting with schematic - Onkyo tx525sv overheating resistors
This has several resistors and an area about the size of a quarter that is looking a burnt brown on the pcb near the front of the unit. There are about 5 or 6 ringed resistors total in this area. Tested and results below. When using the tuner/radio portion all seems to be fine (uses the bypass mode for radio). When using the bypass feature (which only utilizes the 2 rear channels I believe) for the video/theater audio, this works too. The option to use anything that utilizes the DSP portion is a intermittent. Just a low hum or his is presenting thru speakers sometimes. Shame to toss this in the trash because this receiver is an oldy but goody. Seems like I could replace a few resistors and all would be well? Hopefully the community here will be familiar with the issue. Thanks in advance! I have located a service manual but lack the knowlege to read it (link below). I also have pics of the overheated resistor location.
ANSWERS:
"@longoverdue
Hi Edward,
My experience with old electronics is that capacitors deteriorate with age. Look for bulges on the top and leaking brown goo. I fixed a NAD amplifier and a Technics turntable by doing this.
Here is a link for the service manual for your receiver which should help:
https://www.hifiengine.com/manual_librar...
HiFi Engine is a very good site for old electronics. You may already know this but it may help others reading this."
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