JLG 20VP (3120728) Service Manual User Manual
Page 65
SECTION 3 - TROUBLESHOOTING
3120728
– JLG Lift –
3-5
26
6
If voltage @ pin 5 (RED2) of X101 is 20v w/24v @ Battery or if ground controls and operating lift up clears
error:
Defective main contactor
Replace main contactor
Battery cables loose or corroded
Clean & tighten battery cables
26
6
If 0v @ pin 5 of X101, check connection @ pin 7 &
14 of X102
Properly attach wires or pins
26
6
Connection @ pin 5 of X101 bad
Properly attach wires or pins
26
6
Defective Power Relay
Replace Relay
26
6
Defective Power Relay ground wire
Properly attach wire
27
6
Safety Circuit - Joystick - check pin 6 @ X102 (Red
Wire)
Properly attach wire or pin
27
6
Safety Circuit - Joystick - check pin 3 @ joystick
connector (Red Wire)
Properly attach wire or pin
27
6
Defective Joystick - Normal voltage @ pin 6 of X102
(Red Wire): Joystick centered 5v, Joystick not cen-
tered 0v
Replace Joystick
27
6
Safety Circuit - Defective Controller
Replace Controller
28
6
Current Measurement
Replace Controller
29
6
Drive Circuit Left - Defective Controller
Replace Controller
31
6
Drive Circuit Right - Defective Controller
Replace Controller
32
1
Output driver defect - check for short in Hourmeter,
Horn, Alarm or Power Relay
Replace defective component
32
1
Output Driver Defective - Defective Controller
Replace Controller
35
8
Communication Error - Check Pins 5 & 13 of X102
(Orange & Blue Wires)
Properly attach wires or pins
35
8
Communication Error - Check Pins 4 & 5 at Joystick
(Orange & Blue Wires)
Properly attach wires or pins
35
8
Defective Joystick
Replace Joystick
35
8
Defective Controller
Replace Controller
36
6
Watch Dog
Replace Controller
38
6
EEPROM
Replace Controller
39
6
Software Error
Replace Controller
Table 3-2. MC-1 ERROR CODES
(Indicated by rapid LED flashing and periodic beep)
ERROR
CODE
LED’S
FLASHING
PROBABLE CAUSE
REMEDY