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Electrical System
4.2-9 No Jib Up or Down
No Jib Up from Base:
1. Loose or broken wire #10C from resistor R1 to jib
switch S17.
2. Defective jib switch S17.
3. Loose or broken wire #35B from jib switch S17 to
plug A pin 17.
4. Loose or broken wire #35B in boom cable A or
its connectors.
5. Loose or broken wire #35B from plug A pin #17
to platform terminal block.
6. Loose or broken wire #35B from platform
terminal block to jib up valve 4H-35B.
7. Loose or broken wire #02 from platform terminal
block to jib up valve 4H-35B.
8. Defective jib up valve coil 4H-35B.
9. Open or defective diode D35-1.
No Jib Up from Platform Console:
1. Loose or broken wire #04 from platform terminal
block to platform level switch S21.
2. Defective platform level switch S21.
3. Loose or broken wire 35A from S21 to J2 pin #28
of valve driver.
4. No output on J2 pin #24 of the valve driver to
wire #20B.
5. No output on J2 pin #7 of the valve driver to wire
#35.
6. Loose or broken wire 35 from J2 pin #7 of valve
driver to platform terminal strip.
SJ85 AJ
Section 4 – Troubleshooting Information
Check continuity. Replace if defective.
Check continuity through switch while activating up
function between wires #10C and #35B. Replace
switch if no continuity.
Check continuity. Replace if defective.
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 diode. Replace if defective.
Check continuity. Replace if defective.
Check continuity through switch while activating
function between wires #4 and #35A. Replace
switch if no continuity.
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.
Check continuity. Replace if defective.
229044ADA
117
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