Skyjack SJ 3220, Service Manual

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SJ3220, SJ3226, SJ4720, SJ4726, SJ4732 223198ABA
Section 4 – Troubleshooting Information Electrical System
4.2-10 No Down Function from Platform Controls
1.
Control Module CM1 display is broadcasting an
error message.
Check Control Module display screen and follow
instructions to clear error.
2.
Loose or broken wire #09 from Lift/Off/Drive
switch S3 to Control Module CM1 pin #P3-7.
Check continuity. Test for 24V Input voltage
between wire #09 and wire #02.
Use HMI Diagnostic menu to make sure input P3-7
signal is present.
Replace if defective.
3.
Lift//Off/Drive switch S3 is set in an incorrect
mode or is defective.
Select Lift. Check switch. Replace if defective.
4.
Loose or broken wire #59 from Joystick S7 to
Control Module CM1 pin #P1-2.
Check continuity. Use HMI Diagnostic menu to
make sure proportional input P1-2 signal is present.
Replace if defective.
5.
Loose or broken wire #13 from Control Module
CM1 pin #P5-12 to Holding valve coil 2H-13-1
and 2H-13-2.
Check continuity. Test for 24V Output voltage
between wire #13 and wire #02.
Use HMI Diagnostic menu to make sure output
P5-12 signal is present.
Replace if defective.
6.
Loose or broken wire #00C from Holding valve
coils to Control Module CM1 pin #P2-8.
Check continuity. Replace if defective.
7.
Defective Holding valve coil 2H-13-1 or 2H-13-2.
Check continuity through coil. Replace if defective.
8.
Machine overloaded and Overload Lights PL-1
and PL-2 on Emergency Stop buttons flashing.
Check machine limits and reduce weight as
required.
Check Pressure Transducers PT1 and Angle
Transducers AT1 and AT2 functionality
Check wire #60 from Control Module CM1 pin
#P1-8 (overloaded signal)
Test for 24V Output voltage between wire #60 and
wire #02.
Use HMI Diagnostic menu to make sure Output
P1-8 signal is present (pulsed).
9.
External or internal fault detected by Control
Module CM1.
Check Control Module display screen. Use
Diagnostic Menu to see switch and sensor status.
Correct trouble code as displayed. Replace module
if defective.
21.
External or internal fault detected by Control
Module CM1.
Check Control Module display screen. Use
Diagnostic Menu to see switch and sensor status.
Correct trouble code as displayed. Replace module
if defective.