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SJ30AJE, SJ30ARJE 196274AF
Electrical System Section 4 – Troubleshooting Information
4.2-6 No Boom Down from Base Control Console
1. Loose or broken wire #10A from enable switch
S21 to boom switch S20.
Check continuity. Replace if defective.
2. Defective boom switch S20. Check continuity through switch while activating
down function between wires #10A and #13.If no
continuity found, replace switch.
3. Loose or broken wire #13 from boom down
switch S20 to base terminal block.
Check continuity. Replace if defective.
4. Open or defective diode D13. Check diode. Replace if defective.
5. Loose or broken wire #72 from base terminal
block to motor control harness A.
Check continuity. Replace if defective.
6. Loose or broken wire #72 from motor control
harness A pin #21 to left motor controller pin
#LM31.
Check continuity. Replace if defective.
7. Loose or broken wire #13 from base terminal
block to main manifold harness pin #1.
Check continuity. Replace if defective.
8. Loose or broken wire #13 from main manifold
harness plug pin #1 to boom down valve 4H-13.
Check continuity. Replace if defective.
9. Loose or broken wire #02 from main manifold
harness plug to boom down valve 4H-13.
Check continuity. Replace if defective.
10. Defective boom down coil 4H-13. Check continuity and resistance through coil.
Replace if defective.
4.2-7 All Controls Inoperative
1. Loose or broken wire #10A from enable switch
S21 to riser switch S18.
Check continuity. Replace if defective.
2. Defective riser switch S18. Check continuity through switch while activating
up function between wires #10A and #31. Replace
switch if no continuity.
3. Loose or broken wire #31 from riser switch S18
to base terminal block.
Check continuity. Replace if defective.
4. Open or defective diode D31. Check diode. Replace if defective.
5. Loose or broken wire #71 from base terminal
block to motor control harness A.
Check continuity. Replace if defective.
6. Loose or broken wire #71 from motor control
harness A pin #20 to left motor controller pin
#LM20.
Check continuity. Replace if defective.
7. Loose or broken wire #31 from base terminal
block to main manifold harness pin #6.
Check continuity. Replace if defective.
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