Rigol DG4102 Fun Gen output damaged by voltage overload - repaired

• Rigol DG4102 Fun Gen output damaged by voltage overload - repaired
  Posted by tony t on 12 Feb, 2016 08:16
• 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?
  
  
• #1 Reply
  Posted by han on 12 Feb, 2016 08:33
• 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.
• #2 Reply
  Posted by tony t on 12 Feb, 2016 21:39
• 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

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