TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
11. HOOK ARM DOES NOT LOAD IN MANUAL MODE (MODEL B ONLY) (continued).
NOTE
The digital controller and the cab control box are not repairable,
therefore, it is necessary to test the digital controller and cab
interface wiring harnesses, switches, solenoids, and other com-
ponents to identify possible faults other than the digital controller
and the digital cab controller.
13.
TEST OPTIONS
KNOWN INFO
Error Code, EC 05 and/or
Continuity Tests.
Is there continuity
EC 17.
measured at the main
REASON FOR QUESTION
Remote control unit OK.
control wiring harness
Remote control cable
If there is no continuity
(J3) , (J4) and (P2)?
OK.
at the designated
Cab digital control box
positions on the digital
OK.
controller wiring
Cab interface wiring
harness, the 24 volt
harness OK.
power from the cab
digital control box does
POSSIBLE PROBLEMS
not reach the digital
control box.
Digital controller wiring
harness faulty.
Digital control box faulty.
Repair or replace
digital controller
NO
wiring harness
YES
4-214.4
Change 1
8
