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Old 27th Jul 2019, 10:21 pm   #51
Uncle Bulgaria
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Join Date: May 2016
Location: Cornwall, UK.
Posts: 2,315
Default Re: Uher CR240 Troubleshooting Best Practice

Yes - I got that your point was about S1002 being on. I was confused by varying measurements with the switch remaining off. I couldn't see how the mains power pack being inserted could affect the link between 1013 and 607 as the switch remains open.

I'm investigating T10. Latest news is that with the switch closed, C37 replaced with a 100n film type I had lying around after thinking the original was suspect, and the mains connected, it does not turn on and R617 is burning hot.

Interestingly, in the circuit diagram C37 (IC1/IC2 pin decoupling) is 1µF, and on the 1:1 board layouts it's 0.1µF. Similarly, R617 is 1R on the diagram and 2.7R on the layout. In the flesh, it's 0.1R! (Brown, black, silver, silver?)
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