TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
11. HOOK ARM DOES NOT LOAD IN MANUAL MODE (MODEL B ONLY).
NOTE
The digital controller and the cab digital control box are not
repairable, therefore, it is necessary to test the digital controller
and cab interface wiring harnesses, switches, solenoids, and
other components to identify possible faults other than the digital
controller and the digital cab controller.
12.
KNOWN INFO
TEST OPTIONS
Voltage Test.
Error Code, EC 05 and/or
Are 22-28 volts
EC 17.
measured at the cab
REASON FOR QUESTION
Remote control unit OK.
interface wiring
Remote control cable
Power to activate the hook
harness connector
OK.
arm solenoid is supplied
(J2), position #2 and
from the cab digital control
position #3?
POSSIBLE PROBLEMS
box to the digital controller
Cab digital control box
wiring harness via this
faulty.
harness. Faults in this
Cab interface wiring
harness will prevent
harness faulty.
operation from the cab
Digital controller wiring
digital control box.
harness faulty.
Digital control box faulty.
Repair or replace
cab interface
NO
wiring harness
YES
4-214.2
Change 1
6
