LeCroy 9424, Quad Channels Oscilloscope

⚓ Current State

• Only one ADC card, connected to CH1 and CH2
• CH1 seems ok, passes tests
• CH2 have faulty trigger, can’t trigger properly and trigger doesn’t pass tests and calibration
• Doesn’t have the memory card board
  
  
  
• Calibration log
  • Trigger Calibration code 33 for CH2
• Full DC non-linearity analysis : all is within the %
  
  
• According to flow chart of service manual, Trigger Calibration Failure means replacing the 9420-4 TDC (Time Base card)
  
  
• Swapped the Time Base card with a working one from a 9420 and the scope works again.
• Backplane seems a little bit dirty, sometime false contact
• Worst case I swap the backplane with a 9420 one

⚓ Notes

• 9424 shares parts with 9414 and 9450 or 9420

⚓ Pictures

I won’t upload them here, but they are all available Here, organised as sub-folders in high-res.