[frsimen]

Hello Mark,

Things are looking a little more promising with this set of results. There are still a few gaps that need to be filled in for a positive diagnosis but you're getting there.

TP15 should have a pulse waveform, but you're measuring a permanent low. Earlier you reported that pins 6, 11, 14 and 2 of IC 25 all had a pulse waveform on them. Can you confirm that is still the case. You may find that pins 14 and 2 don't change state, they were fixed low on my 9082, your results could be different. Any outputs which are stuck at +12V will stop things working properly.

If the pulses are present, check that they turn up on pins 10,12,11 and 9 of IC24b. If any are missing there, check for bad connections, broken tracks etc. If they are all there, but there is no output on pin 13, IC24b is faulty.

If the outputs (pins 6,11,14,2) on IC25 are not counting, check for a pulse at pin 5 of IC25 and pin 7 of IC14. If the pulse is present at IC14 but not IC25, check for a crack in the print or a poor connection.

If the pulse is present on IC25 pin 5 but it isn't counting, IC25 is faulty.

To get a pulse at TP8, all the inputs to IC8b must be low at the same time. You're measuring a low at TP15, so the output of IC6d will be high and that will stop IC8b going low even if everything else is working.

I hope that by sorting out the problem around IC24 and IC25 you should be a lot nearer to success.

Paula