Skyjack SJ 3220, Service Manual

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SJ3220, SJ3226, SJ4720, SJ4726, SJ4732 223198ABA
Section 4 – Troubleshooting Information Electrical System
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.
Check continuity. Replace if defective.
▪
Loose or broken wire #98B from Main
Disconnect S1 to Emergency Lowering switch
S51.
Check continuity. Replace if defective.
▪
Open or defective Emergency Lowering switch
S51.
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.
4.
Loose or broken 2x wires #00D from Emergency
Lowering switch S51 to Holding valve coils
2H-13-1 and 2H-13-2.
Check continuity. Replace if defective.
5.
Loose or broken 2x wires #13 from Emergency
Lowering switch S51 to Holding valve coils
2H-13-1 and 2H-13-2.
Check continuity. Replace if defective.
6.
Loose or broken wire #00C from Control Module
CM1 pin #P2-8 to Holding valve coils 2H-13-1
and 2H-13-2.
Check continuity. Replace if defective.
7.
Defective isolation Diodes D00C, D13-1 and/
or D13-2 for redundant circuits for Emergency
Lowering.
Check diodes and make sure connected securely.
Replace if defective.
8.
Defective lift cylinder Holding valve coil 2H-13-1
or 2H-13-2.
Check continuity through coil. Replace if defective.
4.2-7 All Controls Inoperative From Platform Control Console
1.
Control Module CM1 display is broadcasting an
error message.
Check Control Module display screen and follow
instructions to clear error.
2.
Loose or broken wire #03A to Circuit Breaker
CB1 or Circuit Breaker is open.
Check continuity to circuit breaker. Test circuit
breaker CB1. Replace if defective.
3.
Loose or broken wire #05 to Base Emergency
Stop switch S28.
Check continuity. Replace if defective.
4.
Open or defective Base Emergency Stop switch
S28.
Close switch by pulling knob out and check switch.
Check continuity between wire #05 and wire #05A.
Replace switch if defective.
5.
Incorrect selection of Base Key Switch S10.
Check switch is on Platform selection.