Kalmar DRD450-80S4X, Maintenance Manual

Page: 57 / 600

UDRF01.04GB
Maintenance manual DRF 400–450
0 Complete machine – Complete machine 7
page –
Troubleshooting cable harness
NOTE
Perform troubleshooting for all cables in the same way to avoid
damage to control units, components or measuring equipment.
1 Study the circuit diagram in question, check where the suspect-
ed cable is connected and if, and if so where, it is spliced.
2 Turn off the main electric power with the battery disconnector.
3 Unplug the connector at the control unit or component in ques-
tion.
4 Check if there is open circuit.
NOTE
Some components cannot be checked without power sup-
ply to the component. In such an event, proceed to point 5.
a. Measure resistance between connections for the compo-
nent in the connector at the control unit or component.
b. The resistance must correspond with the component. Oth-
erwise there may be an open circuit or short circuit in cable
harness and/or component.
5 Check if there is short circuit to frame:
a. Unplug the connector both at the control unit and compo-
nent in question.
b. Measure the resistance of one lead at a time. Measure be-
tween the lead and a frame-connected part of the ma-
chine.
c. The multimeter should show endless resistance.
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