No Down Function From Base Control Console - Skyjack SJ3219 Service Manual

Electrical System
7. Machine overloaded and Overload Lights PL-1
and PL-2 on Emergency Stop buttons flashing
8. Machine not level.
9. Check machine Tilt Procedure.
10. External or internal fault detected by Control
Module CM1

4.2-5 No Down Function from Base Control Console

1. Control Module CM1 display is broadcasting an
error message.
2. Open or defective Lift/Lower switch S2.
3. Loose or broken wire #13A from Lift/Lower
switch S2 to Control Module CM1 pin #P4-4
(Dn signal).
4. Loose or broken wire #13 from Control Module
CM1 pin #P5-12 to holding valve coil 2H-13
5. Loose or broken wire #00C from Holding valve
coil 2H-13 to Control Module CM1 pin #P2-8
6. Defective Lift cylinder holding valve coil 2H-13
SJ3215, SJ3219
Section 4 – Troubleshooting Information
Check machine limits and reduce weight as
required.
Check Pressure Transducer PT1 and Angle
Transducer AT1 functionality
Check wire #60 from Control Module CM1 pin
#P1-8 (overloaded signal).
Test for 24V Output voltage between wire #60 and
wire #00.
Use HMI Diagnostic menu to make sure Output
P1-8 signal is present (pulsed).
Move machine and ONLY use on level surface.
Check Control Module CM1 display.
Check Control Module CM1 display screen and
perform Tilt Calibration Procedure ONLY if level has
been checked and needs adjustment
Check Control Module display screen. Use
Diagnostic Menu to see switch and sensor status.
Correct trouble code as displayed. Replace module
if defective.
Check Control Module display screen and follow
instructions to clear error.
Check switch.
Check continuity between wire #10 and 13A on
switch (Dn Mode)
Replace switch if no continuity when operating
switch.
Check continuity. Test for 24V Input voltage
between wire #13A and wire #00.
Use HMI Diagnostic menu to make sure input P4-4
signal is present.
Replace if defective.
Check continuity. Test for 12V Output voltage
between wire #13 and wire #00.
Use HMI Diagnostic menu to make sure output
P5-12 signal is present.
Replace if defective.
Check continuity. Replace if defective.
Check continuity through coil. Replace if defective.
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