JLG 3969electric ANSI Service Manual - Manual (Page 38)

SECTION 3 - TROUBLESHOOTING
3-8
– JLG Sizzor – 3120768
Table 3-5. Flash Code Troubleshooting Messages
CODE MESSAGE REMEDY
1 Flash Internal fault Replace MOS90
2 Flashes* Check enable wiring
Check for correct start up sequence
Check that both directions are not selected Retry
Retry
Select only one direction
3 Flashes Check power and control wiring for shorts
Replace controller Rectify
4Flashes Check direction contactor tips
Check power wiring for shorts
Check motor for armature to field shorts
Check for shorts to frame and battery leakage
Replace controller Free/change tips
Rectify
Rectify
Rectify
5 Flashes Check contactor tips
Check contactor for mechanical operation and coil
check power and control wiring
Check motor
Replace controller Repair/replace
Repair/replace
Rectify
Rectify
6 Flashes Check operation of hand controller with Test Sequence
Check pot operation with voltmeter for voltage at minimum
setting
Replace controller Rectify/replace
Adjust as necessary or replace
7 Flashes Check battery voltage with voltmeter
Check power connections, fuses, etc.
Check for battery leakage to frame
Replace controller Change/charge battery
Repair or replace
Rectify
8 Flashes Check current draw
Check mounting and heat sinking of controller Rectify
Rectify
10 Flashes Check tachometer wiring
Check speed tachometer
Replace tachometer Repair
Rectify
11 Flashes Recycle emergency stop switch
Check pin voltage Replace tachometer PC board
NOTE: If the machine is operated at a very slow speed or stalled when climbing a grade of 20% or greater, a 10 flash fault will
occur. recycle the emergency stop switch to recover.
NOTE: All flash codes must be checked with unit switched to platform control
* If speed switch is turned 25% - 50% toward full speed, Sevcon controller will give a 2 flash fault indicating a procedure
fault. If, while 2 flash fault is being indicated, the speed control knob is turned to less then 25% the 2 flash fault will stop
and LED will come on steady, indicating controller operational.