
70
Trouble shooting
Turn the machine’s wall switch off and on again.
Start a program.
Error code returns
No error code
Check wiring from X75 on program control unit
PCB to X301 on motor control unit. Use an
ohmmeter to check that the four conductors are
sound as follows:
X75:
X301:
1
-
4
2
-
3
3
-
2
4
-
1
Measure also between the four connections in
X75 to eliminate possibility of short-circuits
between two conductors.
Wiring sound
Wiring faulty
Check input voltage (120/230 V) to the motor
control unit on contact X 311 (measure on rear
of PCB).
Wrong voltage
Voltage correct
Replace motor control
unit.
Malfunction Function
remains
normal
Check voltage (120/230 V) across fuses F21 -
F22.
Wrong voltage
Voltage correct
13E
Program control unit receiving
no response from the motor
control unit.
Error codes which may arise on the control panel display
X75
X311
2316 3333
F22 F21
3332
Error code/symptoms
Fault-finding
X301
Check wiring and replace if
necessary.
Transient fault. No action
required.
Cause/Action
Coil L1 faulty. Replace coil.
Input voltage to machine
incorrect.
Fault in motor control unit
communications circuits.
Probable fault in program
control unit PCB
communications circuits. Refit
the original motor control unit
and replace the program
control unit PCB.