Service manual

34 803402
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Electronic Control Troubleshooting
16. Serial Communication Error (“E SP” on Display)
Restart
machine and
check voltage: Is
there 220-240 VAC (or
120 VAC)* across terminals
"H1-1" and "H1-3"
on motor
control?**
Replace
electronic
control.
Tighten fuse
holder and/or
replace fuse.
No No
Yes
(2)
(1)
(3)
(4)
No
Correct wiring from
electronic control to
motor control.
Is there
continuity through
each wire of the harness
from H8 on the electronic
control to H7 on the
motor control?
Yes
Change the
motor control.
Change the
harness.
Restart
machine and
check voltage: Is
there 220-240 VAC (or
120 VAC)* across terminals
"H7-5" and "H7-6"
on the electronic
control?**
Is the fuse loose or
blown on the motor
control board?
Yes
No
Yes
FLW1785S
*Refer to machine serial plate for correct voltage.
**NOTE: Machine must be restarted to check voltage.
Voltage will be intermittently present during first 15
seconds until E SP is displayed.
1
2
4
3