TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
13. MAIN FRAME 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.
17.
KNOWN INFO
TEST OPTIONS
Is there continuity
Error Code, EC 03.
Continuity Tests.
measured at the main
Remote control unit OK.
REASON FOR QUESTION
frame 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.
solenoid, the 24 volt
Digital controller wiring
power from the digital
harness OK.
control box does not
activate the main frame
POSSIBLE PROBLEMS
load 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--270
4 266
Change 1
