Electrical System; All Controls Inoperative; All Controls Except For Down Function Inoperative - Skyjack SJ 3215 Service Manual

Section 4 - Troubleshooting Information

Electrical System

4.1-1

All Controls Inoperative

1. Battery charger plugged into external power source.
- Disconnect charger cord.
2. Batteries disconnected.
- Connect batteries.
3. Dirty or loose battery terminals.
- Clean and tighten connections.
4. Battery charge low.
- Check each cell with a hydrometer. Reading should be 1.275 (fully charged). Recharge if low
reading. Replace if reading difference between cells is 0.050.
5. Main battery cables open or defective.
- Check continuity. Replace if defective.
6. Fuse F1 defective.
- Replace fuse.
7. Main battery disconnect switch S1 open or defective.
- Close switch. Check continuity. Replace if defective.
8. Loose or broken wire #3 from motor contactor C1 to circuit breaker CB2.
- Check continuity. Replace if defective.
9. Loose or broken wire #3A from circuit breaker CB2 to charger relay L1CR.
- Check continuity. Replace if defective.
10. Defective or tripped circuit breaker CB2.
- Reset circuit breaker. Replace if defective.
11. Defective battery charger relay L1CR.
- Check relay. Replace if defective.
12. Loose or broken wire #5 from charger relay L1CR to base emergency stop switch S28.
- Check continuity. Replace if defective.
13. Open or defective base emergency stop switch S28.
- Close switch. Check switch. Replace if defective.
14. Loose or broken wire #5A from base emergency stop switch S28 to base key switch S10.
- Check continuity. Replace if defective.
15. Open or defective base key switch S10.
- Select function with switch. Check switch. Replace if defective.
16. Loose or broken wire #00 from pump motor DCM1 to circuit breaker CB1.
- Check continuity. Replace if defective.
17. Defective or tripped circuit breaker CB1.
- Reset circuit breaker. Replace if defective.
18. Loose or broken wire #02 from circuit breaker CB1 to base terminal block.
- Check continuity. Replace if defective.
19. Loose or broken wire #7A from base terminal block to CM1 control module pin P2-12. (CE)
- Check continuity. Replace if defective.
20. Loose or broken wire #02 from base terminal block to CM1 control module pin P2-11. (CE)
- Check continuity. Replace if defective.
4.1-2

All Controls Except for Down Function Inoperative

1. Loose or broken wire #59 from base terminal block to proportional valve 2H-59.
- Check continuity. Replace if defective.
2. Loose or broken wire #02 from base terminal block to proportional valve 2H-59.
- Check continuity. Replace if defective.
3. Defective proportional valve coil.
- Check coil for resistance. Reading should be 19 ohms. Replace if defective.
SKYJACK, Page 4
Service and Maintenance
SJIII Compact Series
143909