RIGOL DP832 channel 3 fault/Showing "UR"

[SHARANYA]

Hi

I needed 60v/3A for some troubleshooting & in order to get that,I made a series connection between Ch1 & 2.But due to a ongoing con call,by mistake,I inserted the negative probe to Ch3's positive.Then I shorted the output & instantly some bad smell came out from DP832.Ch3 was showing that "Ch3 is disabled due to overvoltage protection" sort of message.
After the incident,Ch1 & 2 supposed to be working fine.Voltage regulation for Ch3 is ok but it is unable to give 3A output whenever I am shorting the probes.The o/p current is varying instead of a steady 3A & the display is showing for "5v/3A at UR".The "UR" is changing to "CV" sometimes.
What can be the fault?Is the o/p driver transistor or the op amps gone bad? I live in a remote village in India & unable to get any help/service from Rigol here so I have to repair it all by myself so appreciating any kind of help.
I am attaching pics for the connection I made by mistake & the Ch3 output right now whenever shorting....
Also,wondering if anyone is having schematics for the PSU.That would be of great help.

Thanks in advance...

[thm_w]

Probably output transistor would be affected yeah. You'll want to take it apart and measure, look for burned parts, etc.

Did you read through the previous DP832 repair threads?
https://www.eevblog.com/forum/testgear/rigol-dp832-smoked-channel-1/
https://www.eevblog.com/forum/repair/rigol-dp832-power-supply-repair-u18-replacement/