I have the HANMATEK HM305 and it was working fine until today. It displaye voltage and amperage, but the red CC light is on. With it off, I get a dead short between the V+ and V-. I power it up and the red CC is lit up and shorted pos and neg. I checked the fuse and then opened it up to see if I could find a shorted component, but didn't see anything unusual. This unit has been working fine since I bought it from Amazon 4 years ago. Could there be a short somewhere on the DC side? BTW mine doesn't have the USB port on front.

 

A common error is that the power supply is being used incorrectly.

Constant current and constant voltage cannot be invoked at the same time. The current and voltage settings are limits. The power supply will always be at a limit, either current limit or voltage limit, whichever one comes first.

Turn the current limit to the maximum and see if the CC light goes off.

 

I have the HANMATEK HM305 and it was working fine until today. It displaye voltage and amperage, but the red CC light is on. With it off, I get a dead short between the V+ and V-. I power it up and the red CC is lit up and shorted pos and neg. I checked the fuse and then opened it up to see if I could find a shorted component, but didn't see anything unusual. This unit has been working fine since I bought it from Amazon 4 years ago. Could there be a short somewhere on the DC side? BTW mine doesn't have the USB port on front.

I believe it is the 5408 diode between the V+ and V- on the DC section. I removed it anit tested bad.

 

A common error is that the power supply is being used incorrectly.

Constant current and constant voltage cannot be invoked at the same time. The current and voltage settings are limits. The power supply will always be at a limit, either current limit or voltage limit, whichever one comes first.

Turn the current limit to the maximum and see if the CC light goes off.

I believe it is the 5408 diode between the V+ and V- on the DC section. I removed it anit tested bad I had them both set to zero. This happened when I turned it on with nothing connected.










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