Service attempt of Sony tc-wr820a dual cassette deck.
This set has had a hard life.
this video has been pieced together from alot of footage, some of which I thought I had lost, so bear with the sloppy edits.
even after transport service, belt replacement and gear replacement, pinch roller problems and intermittent logic issues with transports made this a nightmare of a machine to work on.
replacing the pilot lamp and tuner tweaks. Looks like this one will turn out just fine. They really should have provided a better means of displaying power. I mean, its just a tiny red dot!
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https://www.youtube.com/watch?v=Hx9Fz_ErNmw
Finally done with troubleshooting dead tuners and IF strips that won't align? Here's a good way to get your video signal in.
previous video with oscillator phase lock failure
https://youtu.be/xDyrLkG6-_s
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https://www.youtube.com/watch?v=d3vPo5fFBG4
This was abandoned by it's owner after finding a plethora of issues that he did not want to address.
So now its mine.
Lets go over its failures and make repairs.
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https://www.youtube.com/watch?v=zwwTAYZoGLM
The owner of this could not get a picture on this set.
This is a very high hour set thats had a hard life. Lets go down the rabbit hole.
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https://www.youtube.com/watch?v=AoI77D3mltc
Here is how to service a belt drive turntable. Everything from examination, to removing belt goo, motor rebuilding (if necessary) and cable replacement. These methods can be used on other belt drive turntables with DC motors.
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https://www.youtube.com/watch?v=ypSAJNVfGqw
Getting the turntable cleaned up and testing after sitting a number of weeks. clutch on tonearm is worn down. otherwise works
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https://www.youtube.com/watch?v=oor1SLwIrCw