Trouble Shooting Chart
No VFD display
Check whether the
voltage between VFD
F1&VFD F2 is AC3V
Go
No
No
No VFD display
Yes
Fix the connection power board
CN1& front board JP1
Check whether the
v12V/+5V on the
front board is normal
Check DC12V to AC 3V switch circuit
Replace U2&VFD.
Yes
Check whether the
voltage -24V is normal
No
Check the FB1 on the front board
4-5
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