Author Topic: Test bench PC power supply issues. (Read 936 times)

shardian · « **on:** January 19, 2009, 04:15:58 pm »

This weekend, I started to go thru my box of Gottlieb system 1 cpu boards. I fixed one up for the bench, applied the power leads, and powered on the power supply -- then nothing. I figured the board was dead, so I checked voltages, also nothing. I pulled the leads of the power supply and checked them directly - nothing again! What would cause an AT power supply to power on, yet not supply +5, and -12???

shardian · « **Reply #1 on:** January 21, 2009, 02:02:25 pm »

No responses???

CheffoJeffo · « **Reply #2 on:** January 21, 2009, 02:13:20 pm »

Assuming that the fuse isn't blown:

Shorted output diode ?
Bad PWM Controller IC ?
Bad "Kick Start" Circuit ?

(I just copied those from Randy Fromm's article on the subject ... I haven't actually read it yet).

shardian · « **Reply #3 on:** January 21, 2009, 02:18:20 pm »

I would assume the fuse isn't blown since the unit powers on (fan runs).

I guess I'll just have to yank a new one.


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Author Topic: Test bench PC power supply issues. (Read 936 times)

shardian

Test bench PC power supply issues.

shardian

Re: Test bench PC power supply issues.

CheffoJeffo

Re: Test bench PC power supply issues.

shardian

Re: Test bench PC power supply issues.