No VFD display
No VFD display
Check whether the voltage
+5V,+12V on the front board
is Normal work or Not.
Check
voltage
F1&VFD F2 is AC24V
Replace U4 or VFD.
Go
Yes
whether
the
between
VFD
Yes
5-5
No
Fix the connection power board
CN502 & front board JP1
No
Check DC5V to AC 24V switch circuit
Trouble shooting chart