Re: Stuck on a BRC 1400!
Bit more work tonight. The valve heater voltages read 6V on a digital multimeter. Not got around to trying a conventional meter where the voltage readings should be around 4V for a 6.3V heater. I guess the service instructions didn't cater for digital multimeters!
Unfortunately, replacing the capacitors as suggested by John hasn't improved matters. It might be the case of replacing everything in the frame timebases but will check the thermistor as suggested by Steve as well.
The switch off collapsing square occupies the top half of the screen rather than the central, probably due to the adjustments to enable the screen to be filled.
The width control. Knowing from experience it's never a good idea to attempt ex equipment spares. Despite clearing and enlarging the holes I couldn't get the damn control to fit and ended up ruining it.
Had no choice but to re-fit the original 1M control. As Dazzlevision predicted there was lack of width as I'd already changed the feed resistor to 680K. Not wishing to disturb it I fitted another temporarily on the print side in parallel. Well 680K รท 2 is about right: 340K!
On the plus side the CRT's beginning to look much better.
Cheers
Brian
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