Electronics > Repair
GW GPC-3030 power supply
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LA2BPA:
Hi,
I have a GW GPC-3030 power supply. It has three channels, two of them is adjustable (master/slave).
The master channel seems to be working as it should, however the slave channel is not.
The output voltage can't be adjusted, it just stays at 32V whatever i do.

I have checked op-amps, transistors, diodes and potmeters in the regulator circuits.

Any ideas?
Harry_22:
Hi!

Could you attach a photo of PCB. I think I have a similar device.
LA2BPA:
Here is a couple of images of the unit. Frontpanel, main pcb and a bird view.
wraper:
Measure voltages in operation. Start from measuring if potentiometer actually adjusts the voltage on its wiper terminal.
Poroit:
This may help if you don't already have a copy.

Page 5 gives you a Circuit Arrangement.
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