All Controls Inoperative From Platform Control Console - Skyjack SJ3220 Service Manual

Section 4 – Troubleshooting Information
Scenario B:
Emergency Lowering toggle switch S51 held in "down" position as per electrical schematic.
▪
Loose or broken wire #00 from B- lug on
▪
Control Module CM1 to Emergency Lowering
switch S51.
Loose or broken wire #98B from Main
▪
Disconnect S1 to Emergency Lowering switch
S51.
Open or defective Emergency Lowering switch
▪
S51.
4. Loose or broken 2x wires #00D from Emergency
Lowering switch S51 to Holding valve coils
2H-13-1 and 2H-13-2.
5. Loose or broken 2x wires #13 from Emergency
Lowering switch S51 to Holding valve coils
2H-13-1 and 2H-13-2.
6. Loose or broken wire #00C from Control Module
CM1 pin #P2-8 to Holding valve coils 2H-13-1
and 2H-13-2.
7. Defective isolation Diodes D00C, D13-1 and/
or D13-2 for redundant circuits for Emergency
Lowering.
8. Defective lift cylinder Holding valve coil 2H-13-1
or 2H-13-2.

4.2-7 All Controls Inoperative From Platform Control Console

1. Control Module CM1 display is broadcasting an
error message.
2. Loose or broken wire #03A to Circuit Breaker
CB1 or Circuit Breaker is open.
3. Loose or broken wire #05 to Base Emergency
Stop switch S28.
4. Open or defective Base Emergency Stop switch
S28.
5. Incorrect selection of Base Key Switch S10.
223198ABA
102
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity between wire #00 and wire #00D
on switch, and check continuity between wire #98B
and wire #13 on switch.
Replace switch if no continuity on both of these two
(2) contacts of switch.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check diodes and make sure connected securely.
Replace if defective.
Check continuity through coil. Replace if defective.
Check Control Module display screen and follow
instructions to clear error.
Check continuity to circuit breaker. Test circuit
breaker CB1. Replace if defective.
Check continuity. Replace if defective.
Close switch by pulling knob out and check switch.
Check continuity between wire #05 and wire #05A.
Replace switch if defective.
Check switch is on Platform selection.
SJ3220, SJ3226, SJ4720, SJ4726, SJ4732
Electrical System