Quote:
Originally Posted by Chris K
I just watched the latest installment. Great stuff and very well instructed. I have a GE 805 "Locomotive" TV that I'm trying to align. Unfortunately, the instructions in the service data does not detail DC peaking with a VTVM and a signal generator. They show the sweep patterns to peak each slug to the correct shape of different traces they show. Can I use the method with the VTVM and just peak the coils or do I need to do it with the scope the way they instruct in the procedure and make little hills and valleys the right shape?
Thanks all.
Chris
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Sure you can just use a voltmeter and a calibrated signal generator.
But no matter which version of the set you have, you need a bias
box (a 9v battery with a 5 or 10K pot across it) to set the bias voltage
at the junction of R241 and R243 to -4 volts. This is because the DC from the output otherwise backs up to there ... this does not matter at 60 Hz.
Use an analog meter between pins 2 and 3 of V8A.
Then you just sweep the generator slowly by hand to get the patterns shown. Tedious but it works.