19-11-2014, 02:55 PM
(18-11-2014, 12:21 PM)pwdrive Wrote: If it doesn't trigger on CH1 or CH2 then I can't see anything on that schematic that's common to both channels in a switched trigger sense unless I'm missing something.
Lawrence.
Hi Lawrence,
TR66 is driven by an oscillator when the trigger is set to 'chopped CH1/CH2' so I assume this switches the output of each channel trigger amp alternatively. Each channel amp is pretty much identical. My hypothesis is that since the original big fault was the power supply went bang (with smoke) that one of the rails did something to take out both channels since the same resistors show signs of overheating in each one.
I'll get some more time it at the weekend.
Cheers, John
Time flies like an arrow, fruitflies like a banana!
