No Boom Up Or Down - Skyjack SJ85 AJ Service Manual

Electrical System
5. If telematics device is not installed: loose, broken
or missing Jumper JMPR1 from 57DCR pin 85 to
ground 00.
6. Loose or broken wire 57D from telematics pin 9
to 57DCR pin 85.
7. Missing output from telematics pin 9.
8. Defective relay 57DCR.
9. Loose or broken wire 57B from 57DCR pin 87 to
engine starter contactor coil.
10. Defective telematics module.
11. Loose or broken wire #14 from boom switch S12
to base terminal block.
12. Loose or broken wire #14 from base terminal
block to turret harness plug pin #4.
13. Loose or broken wire #14 from turret harness
plug pin #4 to boom up valve 4H-14.
14. Loose or broken wire #02 from turret harness
plug to boom up valve 4H-14.
15. Defective boom up coil 4H-14.

4.2-4 No Boom Up or Down

No Boom Up from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to joystick controller A1.
2. Loose or broken wire #02 from platform terminal
block to joystick controller A1.
3. No output on y-axis of joystick controller A1.
4. Loose or broken wire "Y" from joystick controller
to J3 pin #16 of valve driver.
5. No output on J3 pin #24 of the valve driver to
wire #20B.
6. No output on J2 pin #5 of the valve driver to wire
#14.
SJ85 AJ
Section 4 – Troubleshooting Information
Check continuity. Replace if defective or missing.
Check continuity. Replace if defective.
Check for ground on pin 9. If no ground, contact
the machine owner.
Check relay. Replace if defective.
Check continuity. Replace if defective.
Check telematics assembly; repair or replace as
required.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Check continuity and resistance through coil.
Replace if defective.
Check continuity. Replace if defective.
Check continuity. Replace if defective.
Refer to the joystick test procedure in section 5.
Check continuity. Replace if defective.
Check for 12 volts. If no voltage present with foot
on footswitch check section 5 for OCM pin voltage
reference.
Check for a minimum 3.5 volts. If no voltage
present with foot on footswitch check section 5 for
OCM pin voltage reference.
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