Electronics > Repair

Help with dead AT PC Power Supply

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Harry_22:
Please see the corrected picture

Harry_22:
Measure C10 capacitor
Use the drawing below to understand the possible connection.

naujoks:
Pin 4 of the opto coupler is connected to pin 6/7 on the board (pin 8 of the PWM).
Pin 4 and 6 do not connect to the PWM or the board.

Harry_22:
Ring optocoupler pins 4,5,6 in diode mode, assuming that this is NPN transistor.

naujoks:
I didn't know which pins to treat as B, C and E, so I just took some measurements:
Red probe on 6: 0.61V between 6-5 and 6-4. OL when black on 6.
Red on 5: OL between 4 and 6. Black on 5: 0.61V between 5 and 6, OL between 5 and 4
Red on 4: OL between 5 and 6. Black on 6: OL between 4 and 5, 0.61 between 6.

I hope that's useful.

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