96
SJ30AJE, SJ30ARJE196274AF
Section 4 – Troubleshooting Information Electrical System
4.2-16 No Jib Down from Base Control Console
1. Loose or broken wire #10A from enable switch
S21 to jib switch S16.
Check continuity. Replace if defective.
2. Defective jib switch S16. Check continuity through switch while activating jib
down function between wires #10A and #34. If no
continuity found, replace switch.
3. Loose or broken wire #34 from jib switch S16 to
base terminal block.
Check continuity. Replace if defective.
4. Open or defective diode D34. Check diode. Replace if defective.
5. Loose or broken wire #73 from base terminal
block to motor control harness A.
Check continuity. Replace if defective.
6. Loose or broken wire #73 from motor control
harness A pin #22 to left motor controller pin
#LM32.
Check continuity. Replace if defective.
7. Loose or broken wire #34 from base control
block to platform plug A pin #16 in base control
console.
Check continuity. Replace if defective.
8. Loose or broken wire #34 in boom cable A or its
connectors.
Check for continuity between pins #16 on cable A.
Check for loose or corroded connections on cable
connectors. Replace if wire is defective.
9. Loose or broken wire #34 plug A pin #16 to
platform terminal block.
Check continuity. Replace if defective.
10. Loose or broken wire #34 from platform terminal
block to jib down valve 4H-34.
Check continuity. Replace if defective.
11. Loose or broken wire #02 from platform terminal
block to jib down valve 4H-34.
Check continuity. Replace if defective.
12. Defective platform jib down coil 4H-34. Check continuity and resistance through coil.
Replace if defective.
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