TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (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.
11.
TEST OPTIONS
KNOWN INFO
Error Codes, EC11 and
Voltage Test.
Are 2228 volts mea-
EC12
sured at cab interface
REASON FOR QUESTION
Worklight bulb OK.
wiring harness connec-
Both worklight and
tor (J2), position # 2
The main frame worklight
spotlight are inoperative.
and position # 6?
receives its power source
Worklight switch OK.
from the cab interface
Wire no. 40 OK.
wiring harness. The
main frame worklight will
POSSIBLE PROBLEMS
not operate if there is no
Cab interface wiring
voltage supply at
harness faulty.
positions # 2 and # 6.
Digital controller wiring
harness faulty.
Digital control box faulty.
Worklight harness faulty.
Repair or replace
cab interface
NO
wiring harness
YES
4-96.2
4- 4
Change 1
