Service Manual Owner's manual

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