Fishoz's PL 400 Conversion

[Fishoz]

Whew....

 

[laatsch55]

That means we still have a problem in the chassis. I THINK it has to do with the DC protect board. It is supplied B+ voltage off the backplanes, and there are a couple diodes that look toasty. I'll hook things back up and isolate the DC protect and go from there....

 

[NavLinear]

Don't doubt that, but they don't test every one do they, just batch test??

I suspect so as testing all components is costly.

 

[Gepetto]

Don't doubt that, but they don't test every one do they, just batch test??

Every One Lee

 

[Gepetto]

Pulled the BR and the caps. Hooked them up temporarily on the bench. Then hooked the transformer to the BR. I have DC voltage...

Make sure you check for no shorts of each winding to the transformer case/laminations.

 

[laatsch55]

Will do....thanks Joe.

 

[laatsch55]

Every One Lee

That explains some of the cost...

 

[Gepetto]

That explains some of the cost...

It is highly automated though Lee...

 

[laatsch55]

Have you toured the facility??

 

[laatsch55]

Transformer windings are good....

 

[Gepetto]

Have you toured the facility??

Not theirs Lee but have toured numerous others...

 

[Gepetto]

Transformer windings are good....

Good to hear, it is all repairable then.

 

[Fishoz]

Good to hear, it is all repairable then.

Whew #2!

 

[laatsch55]

Good to hear, it is all repairable then.

Yes, still leaning towards the DC protect board as my problem. I've probed around the backplanes A LOT and can't find a short there anymore...

 

[laatsch55]

It is not the DC protect. Isolated the DC protect and still have a high current draw on the B+ rail...

 

[NavLinear]

Every One Lee

That's good to hear. I was wondering if that was true based on the price.

 

[Gepetto]

That's good to hear. I was wondering if that was true based on the price.

The price is based on the die size of the silicon and the package cost primarily.

 

[laatsch55]

Got the tool Joe!!


Still troubleshooting Fish!!

 

[laatsch55]

3 minus side outputs were shorted emitter to collector........

 

[laatsch55]

That cured my high current draw, now the bulb does go dim...