Cadac PSU not working

[simonsez]

Hello,

It's for the Cadac type-J console , the -18V supply module is ok , but the +18V supply module is not working.
Each module consist of 2x 44Amp card, both both card has no output, so I guess it's the mainboard.
unfortuately I can't find the schematic for this PSU.

Any experience with this? Thank you in advance!

 

[simonsez]

more pic

 

[mjrippe]

88A? That is a scary power supply! And the modules take 300VDC input? I would start by seeing if they are getting fed the HV. If they are, then the modules are probably at fault. If not, see where the 300V splits to the POS and NEG supplies and what is in between there and the POS side modules.

 

[simonsez]

88A? That is a scary power supply! And the modules take 300VDC input? I would start by seeing if they are getting fed the HV. If they are, then the modules are probably at fault. If not, see where the 300V splits to the POS and NEG supplies and what is in between there and the POS side modules.

Yes, 2x 88A I will take card from the -18V section and put on there and see, if not working then it must be the mainboard fault. They're identical module.

I suspect it's the mainboard fault because both cards on the +18V supply not working.

 

[mjrippe]

I agree, you need to find that 300V line and follow it.

 

[tron23]

Hi simonsez, did you end up fixing the power supply? Have you located any schematics for the j type? Best wishes!