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GW Instek GPD-3303S channel 1 output voltage issues

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nikhilji:
Newbie here. Need some troubleshooting help. I have a GW Instek GPD-3303S that started giving me some trouble. when I press the output button for a preset voltage/current for channel 1, channel 1 goes to 0V, 0A. Any idea why this is happening? The other channel works just fine. I don't see the OV  LED coming on either.  I might be missing something very trivial, but appreciate any help with troubleshooting this. Thanks!

electr_peter:
What voltage and current setting is for channel 1? Does it go into CC (constant current) mode? If current is set to a low value, it is possible to have 0V 0A on display in CC mode.

Also, try measuring both output voltage and current on channel 1 with external multimeter. What values do you get?

nikhilji:
Thank you for your response. Turned out the fuse for the channel 1 was blown. These fuses are the axial leaded types so I didn’t behave them in my parts bin. Waiting for the fuse to arrive in the mail. Hopefully nothing else is blown that caused the fuse to blow in the first place.

nikhilji:
Fuse F101 keeps blowing. I posted the schematic below. I checked c101 electrolytic cap - seems to show the correct value on my MM.



What else should I be checking? Any troubleshooting help is appreciated. Thanks!

srb1954:

--- Quote from: nikhilji on September 13, 2022, 05:38:37 am ---Fuse F101 keeps blowing. I posted the schematic below. I checked c101 electrolytic cap - seems to show the correct value on my MM.



What else should I be checking? Any troubleshooting help is appreciated. Thanks!

--- End quote ---

Have you checked that none of the diodes in the bridge rectifier are shorted?

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