Test by swapping left and right amplifier harness
connections. Replace system controller field fix.
Bad system controller.
Check amplifier harness for shorts or broken wires
and replace if necessary.
Bad amplifier harness.
Replace traction amplifier.
Bad traction amplifier. To check, switch
amplifier harnesses and see if fault follows.
Test battery under load and replace if necessary.
Battery voltage too low, especially if error occurs
while operating truck.
Solution
Possible Cause
TOTAL shutdown.
Criteria
Resulting Effect
LEFT/RIGHT TRACTION C15 VOLTAGE OUT OF RANGE
Fault condition
E72L
E72L
E72R
E72R
Replace system controller field fix.
Bad system controller.
Solution
Possible Cause
A/D chip failure.
TOTAL shutdown.
Criteria
Resulting Effect
SYSTEM CONTROL HARDWARE FAILURE
Fault condition
E77
E77
Replace software board.
Software corrupted in memory.
Solution
Possible Cause
TOTAL shutdown.
Criteria
Resulting Effect
SYSTEM CONTROL SOFTWARE FAILURE
Fault condition
E78A
E78A
Replace operator display board.
Bad operator display board.
Solution
Possible Cause
TOTAL shutdown.
Criteria
Resulting Effect
DISPLAY CONFIGURATION DATA LOST
Fault condition
E78D
E78D
E
lectric
C
ounterbalance
H
igh
O
utput
Troubleshooting
REV 12/5/99
TS.15