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Electronics => Repair => Topic started by: tony t on February 12, 2016, 08:16:40 am

Title: Rigol DG4102 Fun Gen output damaged by voltage overload - repaired
Post by: tony t on February 12, 2016, 08:16:40 am

Accidently applied 24V to the output of my Rigol DG4102.

“OverLoad protect, The output is off!”  appeared.  I disconnected everything, powered cycled the unit but the output system is damaged.   Output is about at 80% level and weird offset voltage on output.

Looked at the rear side of PCB and measured all the resistors between channel 1 and 2 but cannot determine which component is bad. All components physically look okay.

Any advise?

Title: Re: Rigol DG4102 Fun Gen output damaged
Post by: han on February 12, 2016, 08:33:56 am

1. Try warranty first
2. If Warranty is not covered or the shipping is to expensive and you want to repair your own:
-Check the signal path backward, find where the signal start to distort
-Probably the diode limiting protection is damage and shorted.

Title: Re: Rigol DG4102 Fun Gen output damaged by voltage overload - repaired
Post by: tony t on February 12, 2016, 09:39:50 pm

Okay, problem fixed.  Channel 2 working again.
Found a burnt out resistor, 31.4 ohm see image.
Replaced with 51 & 82 ohm  0602 resistor - 31.4 ohm