TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
14. MAIN FRAME DOES NOT UNLOAD 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.
18.
KNOWN INFO
TEST OPTIONS
Is there continuity mea-
Error Code, EC 02.
Continuity Tests.
sured at the main
Remote control unit OK.
REASON FOR QUESTION
frameun load valve
Remote control cable
solenoid?
OK.
If there is no continuity
Cab digital control box
at the designated
OK.
positions on the main
Cab interface wiring
frame load valve
harness OK. Digital
solenoid, the 24 volt
controller wiring harness
power from the digital
OK.
control box does not
activate the main frame
POSSIBLE PROBLEMS
unload valve.
Main frame load valve
solenoid faulty.
Digital control box faulty.
Repair or replace
NO
main frame load
valve (para 5-25).
YES
If all previous
tests were
completed with a
satifactory result,
replace digital
control box (para
4--302 .4
4 298
Change 1
