Adventure in fixing a Lisa DataPower PSU

[sigma7]

which one is the -12V and -5V

In one of your videos we saw that you had the schematic. Presumably you used it to make the other connections, so locating these is the same process...

Double check the schematic to see if these are correct:

• Minus 12 at pin W
• Minus 5 at pin 19

[berskyboy]

n one of your videos we saw that you had the schematic. Presumably you used it to make the other connections, so locating these is the same process...

Double check the schematic to see if these are correct:

• Minus 12 at pin W
• Minus 5 at pin 19

[/list]

NO DICE

https://www.youtube.com/shorts/3PCBanL0fks

I will replace the 16V capacitor tomorrow when I get it from Amazon.

[sigma7]

NO DICE

https://www.youtube.com/shorts/3PCBanL0fks

I will replace the 16V capacitor tomorrow when I get it from Amazon.

The 16V capacitor wouldn't/couldn't have the effect of nothing happening.

See if there is 120VAC at the power connector.

If so, check the fuse.

If ok, check the safety interlock switch is pressed.

What was the solution to the problem that changed the "brief turn-on then slow decrease in voltage"  condition into the "it works" condition? Was the card-edge not fully plugged in or something? That seems like a good suspect.

If still no joy, measure the +5 Standby voltage on pin 20 (connected to the small switch).

The white with yellow stripe ground wire that goes to the PSU case is missing the lockwasher and nut.

[berskyboy]

The 16V capacitor wouldn't/couldn't have the effect of nothing happening.

See if there is 120VAC at the power connector.

If so, check the fuse.

If ok, check the safety interlock switch is pressed.

What was the solution to the problem that changed the "brief turn-on then slow decrease in voltage"  condition into the "it works" condition? Was the card-edge not fully plugged in or something? That seems like a good suspect.

If still no joy, measure the +5 Standby voltage on pin 20 (connected to the small switch).

The white with yellow stripe ground wire that goes to the PSU case is missing the lockwasher and nut.

Hi Sigma7, good morning, good news... after checking the rear switch and putting alcohol on the connectors.  She lives again.  Here's the video.  (5V, 12V, and 33V) Wow!  Thanks so much

https://www.youtube.com/shorts/jBJMnzygqcw

[ried]

Holy macaroni, what a journey.

[sigma7]

She lives again.  Here's the video.  (5V, 12V, and 33V) Wow!  Thanks so much

Congrats and you're welcome. Thanks for your help testing this process!