❓ Question — from a machine importer, Ahmedabad
We buy used CNC boards and drives regularly for machine rebuilds. What's a sensible acceptance checklist before we fit a used part into a customer's machine?
✅ Answer — JJ Automation Technical Team
Good discipline. Here's the checklist we use on every tested-used part we ship:
Visual (before power)
- No electrolyte stains or bulged capacitors; no scorched areas around power devices.
- Connector pins straight, no corrosion (coastal-region boards especially).
- Conformal coating intact; no amateur solder rework on BGA/fine-pitch areas.
- For drives: DC bus terminals clean, no arcing marks; fan spins freely.
- For motors: shaft turns smoothly, no bearing notchiness; megger winding-to-frame ≥100MΩ at 500V.
Before installing
- BACK UP the machine first — parameters, ladder, offsets, macros. A new board means re-entering data; a backup makes it 30 minutes instead of 3 days.
- Match part number AND note revision suffix (see our part number thread).
- Move battery/SRAM from old board where applicable — on many Fanuc motherboards, parameters live on the board.
- Check jumper/DIP switch settings against the old board before first power-up.
First power-up
- Power with servos disabled (E-stop pressed) first; verify boot and alarms before enabling motion.
- For drives, first run at low speed with no load where possible.
What does your incoming inspection look like? Reply below — especially interested in what failures you've caught at inspection.
Every used part we sell is bench-tested with warranty. Browse the catalog · Call +91 88022 12394.