TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
15. LHS DOES NOT OPERATE PROPERLY IN AUTO MODE (CAB ONLY)
(continued).
VOLTAGE TEST
UPPER
(1) Remove four screws and lockwashers
BODY
from cab control box.
(2) Remove six screws from cab control
box and separate upper body from
base.
CAUTION
Use care when removing relay
from circuit board. Failure to
comply with this caution may
result in damage to circuit
board.
(3) Remove relay K6 from cab control box
circuit board.
(4) Turn engine start switch to ON
position.
(5) Turn light control switch to STOP
BASE
LIGHT position.
(6) Set multimeter to voltage position.
NOTE
A reading of infinity indicates an
open circuit.
This test can also be accomplished
by observing the status of LED D9.
(7) Connect one multimeter lead to
terminal 85 of relay K6 socket and
the other multimeter lead to a known
good ground. Check multimeter for
voltage.
RELAY (K6)
SOCKET
4-347
