Hi Grizewald,
Thanks for the help, I'm going to need it
Yes, I think they are the earlier PCBs.
Pin 1 of IC315 is seeing a 1.5khz pulse train - going low for about 50ns so 315 should be getting reset.
Also I only see Q1 (pin 2 and 4) go high and pin10 never goes high.
Pin 15 (Glug dead signal of the HH63B21) is low.
So that possibly leaves a problem with the Glug Dead input bit (pin 15) on the PIA being faulty?
AHHHHHH !
Just before sending this post, I was checking that all the buttons on the front panel worked....which they do.
Did reset and it says self test passed, 7061 Initialised with no Glug Death displayed
Turning the meter off and back on again shows Glug Death but clears with a front keyboard reset.
Quick check and :-
DC V are working at least up to 20v
Ohms - a 10k resistor on the 10000 range reads 9.903 KOhm
the same 10k resistor on the 1000 range reads 0.003,6 KOhm so something looks a bit screwy there.
Possibly someone has mucked about with the calibration???
So at least 2 steps forward.
edit: RTFM !
Need 4 wires connected for ohms measurement.
Which results in some sensible readings :-)
Looking much better.
Now if I could work out what's causing the Glug Death on startup?