TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
14. MAIN FRAME DOES NOT UNLOAD 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.
16.
TEST OPTIONS
KNOWN INFO
Voltage Test.
Error Code, EC 02.
Are 22-28 volts
Remote control unit OK.
measured at the cab
REASON FOR QUESTION
Remote control cable
interface wiring
OK.
Power to activate the hook
harness connector
arm solenoid is supplied
(J2), position "2" and
POSSIBLE PROBLEMS
from the cab digital control
position "3"?
Cab digital control box
box to the digital controller
faulty.
wiring harness via this
Cab interface wiring
harness. Faults in this
harness faulty.
harness will prevent
Digital controller wiring
operation from the cab
harness faulty.
digital control box.
Digital control box faulty.
Repair or replace
cab interface
NO
wiring harness
YES
4-298
Change 1
