TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
CONTINUITY TEST
(1) Remove hydraulic cabinet cover
CAUTION
MAIN FRAME
Electrical power must be shut
JUNCTION BOX
off from circuit before conti-
HARNESS
nuity can be checked. Failure
CONNECTOR (J6)
to comply with this caution
MAIN FRAME
may result in damage to test
(9-PIN) LINKING
JUNCTION BOX
equipment or electrical sys-
HARNESS
CONNECTOR (P6)
tem.
CONNECTOR
(J3)
(2) Disconnect main frame junction
box connector (P6) from main
junction box.
(3) Set multimeter to ohms position.
NOTE
A reading of infinity indicates
an open circuit.
(4) Connect multimeter leads to
each end of wire, and check
multimeter for continuity. Check
for continuity between the small
linking harness connector,
position G, and the main frame
junction box harness connector,
position H.
NOTE
Any reading besides infinity
indicates a grounded wire.
(5) Remove multimeter lead from one
end of wire and connect to
chassis ground.
Change 1
4-91
