Quote:
|
Originally Posted by jpdylon
First, disconnect the B+ line going to the space command module and see if it will fire up. .
|
There is a 4-pin card edge connector that connects to the space command module. red, white/red, violet, wht/violet. I disconnected this connector, and powered up, and the circuit breaker blows. I assume on of these wires is the B+.
Quote:
|
Originally Posted by jpdylon
If not, measure the resistance between the secondary transformer taps to ground. Only the black wire should have a low resistance IIRC.
|
I believe I did this when I had the rectifier board out, measuring each sec lead from the pwr trans to GND, and saw no shorts. I'll double-check it.
Quote:
|
Originally Posted by jpdylon
Test the power supply rectifiers and input filters as well. You can connect an ohm meter across a filter cap and see if it charges up (displayed as a continuing rise in resistance) if it stays at a lower resistance and does not go up, replace that filter cap. A bad filter cap can also destroy the main rectifiers.
|
The rectifier board has 3 full-wave rectifier circuits (2 diodes each) and one half-wave rect. All diodes checked OK using diode check on a meter.
The 2-terminal "AC cap" (oval cap) is not shorted section to section or section to case. I'll recheck the 4-section electrolytic can cap. It's a Nippon Chemi-Con, 300uF/150V, 300u/150, 1000u/85, 500u/35.