UB7 6560-101 VIC VIDEO/AUDIO
White or blank screen, garbled or no video, screen full of (or few
random) "garbage" characters. "Blind" disk commands may still work.
Partial failure: Dark or smeary image, loss of color, garbled or no
sound, game paddles or light pen doesn't work.
... and swapped it. Same result.
Then I thought trimmer near the VIC-I, but which one (2 prong PSU). I can see 3...
Last edited by mrr19121970 on Sat Apr 16, 2016 11:50 am, edited 3 times in total.
Those two, R7 and R32, are trimmer resistors and control video signal amplitude and biasing of the emitter follower in the video amplifier.
The trimmer capacitor C35 is reponsible for fine tuning of the master oscillator clock. Unless it's so much off, that the colour carrier frequency isn't anymore recognised by the TV set or monitor (and you'd get a grey picture), you were well advised to leave it alone.
Last edited by Mike on Sat Apr 16, 2016 11:47 am, edited 1 time in total.
