Resurrected a Customized WOPL 400

With no outputs in, no fuses blowing, the bulb should be dark. The cycling you are talking about is the recharging of the main caps. If the +/- 15 voltage is good, and the backplane fuses are good , I don't think there is anything wrong...
 
Yeah, dah, of course. Now I understand. There are two fuses on each board. On both boards, the top fuse has continuity, but not the bottom. The bottom has no continuity.
 
laatsch55 said:
With no outputs in, no fuses blowing, the bulb should be dark. The cycling you are talking about is the recharging of the main caps. If the +/- 15 voltage is good, and the backplane fuses are good , I don't think there is anything wrong...
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My other problem, however, is that the relay isn't working.
 
A blown backplane fuse could cause the relay not to work. Check DC offset next time it's turned on...
 
You had problems with a bias tranny right?? Check offset on both channels...
 
laatsch55 said:
You had problems with a bias tranny right?? Check offset on both channels...
Click to expand...

I didn't check the bias. I'll do it right now. I thought the fuses would make everything moot. But I'll put the meter on it now.
 
From the bias test points on the board, to the respective + speaker posts I get open circuit. Nothing. On the top +15v point, I get +15v. On the bottom -15v point, I get 1.4v. Also, I'm not getting any voltage to the leads that provide power to the meter light-fuses.
 
scottonnob said:
From the bias test points on the board, to the respective + speaker posts I get open circuit. Nothing. On the top +15v point, I get +15v. On the bottom -15v point, I get 1.4v. Also, I'm not getting any voltage to the leads that provide power to the meter light-fuses.
Click to expand...

Sorry, 0 offset, both channels.
 
With the relay out, youre not going to get anything from the speaker posts, you'll have to test from the "out" test point on the backplane. Check rail voltage on the top of the backplanes also...
 
laatsch55 said:
With the relay out, youre not going to get anything from the speaker posts, you'll have to test from the "out" test point on the backplane. Check rail voltage on the top of the backplanes also...
Click to expand...

Okay, one more time. Be right back.
 
From GND, TP3 to OUT on the backplane boards, I'm getting, believe it or not, left 66.8vdc, right 12.94vdc.
 
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