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
(1) Remove four screws and lockwashers
and access panel from heater
compartment.
(2) Remove four screws and lockwashers
~
from cab control box.
ACCESS
(3) Remove six screws from cab control
COVER
box and separate upper body from
CAB
base.
CONTROL
BOX
CAUTION
UPPER
Use care when removing relay
BODY
from circuit board. Failure to
comply with this caution may
result in damage to circuit
board.
(4) Remove relay K8 from cab control box
circuit board.
(5) Turn engine start switch to ON
position.
(6) Turn light control switch to STOP
LIGHT position.
(7) Set multimeter to voltage position.
NOTE
BASE
A reading of infinity indicates an
open circuit.
This test can also be accomplished
by observing the status of LED D56.
(8) Connect one multimeter lead to
terminal 30 of relay K8 socket and the
other multimeter lead to a known good
ground, while assistant holds the
joystick in the UNLOAD position.
Check multimeter for voltage.
RELAY (K8)
SOCKET
4-309
