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.
(3) Remove six screws from cab control
box and separate upper body from
~
base.
ACCESS
CAB
COVER
CAUTION
CONTROL
BOX
Use care when removing relay
from circuit board. Failure to
UPPER
comply with this caution may
BODY
result in damage to circuit
board.
(4) Remove relay K6 from cab control box
circuit board.
(5) Turn engine start switch to ON
position.
(6) Turn light control switch to STOP
LIGHT position.
BASE
(7) 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
D55.
(8) Connect one multimeter lead to
terminal 30, of relay K6 socket and
the other multimeter lead to a known
good ground, while assistant holds
the joystick in the LOAD position.
Check multimeter for voltage.
RELAY (K6)
SOCKET
4-331
