Lee: Please clarify
Voltage readings on pin 01 and pin02 ground referenced and red probe to pin black probe to ground. Do NOT up from 60w bulb and be relatively quick if you can getting the readings.
DBT remains in place, with 60 watt bulb. Volume is at zero. Mode selector was at FM Auto, but I just changed that to Phono 2.
I connect the DMMs to pins, components or test points with power off, then turn it on long enough for the readings to stabilize and safe operate relay to engage. Then I turn power off.
Pins 01,02 &03 of the 2980 board are all the same, and tied to the 7.2vac windings of the transformer.
Readings for main caps were taken across the 3.9KΩ(2) resistor tied to their terminals, effectively from ground to the + or - terminal. All other readings were taken with the negative probe clipped to the black wire of the transformer, the center tap of the 33vac windings, used as ground throughout the P/S.
During troubleshooting I took the screw out of the main caps (non-ground terminal) because the DMM readings were climbing indicating a charging cap somewhere. Readings stabilized when I took the main caps out of the circuit. Screws have been replaced.
The only other wiring that was changed is the jumpers between the 2980 bd & the 3058 bds. I will re-check that. Will also look for any wiring that might have been disrupted in the YEAR since I started working on this thing.
The one time that I had it up & running (when I shorted something on the 3058 bd) the safe operate relay was stable, but I did not think to take any voltage readings before I sparked it. This was the first time it has been powered on since then.
Are there any specific voltage readings that would help to diagnose this problem?