| 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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