TM 9-4940-568-20
2-122
Table 2-21. Crane Troubleshooting (CONT).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. REMOTE CONTROL DOES NOT OPERATE.
NOTE
Before performing crane troubleshooting procedures, make sure the FRS electrical
supply system is functioning properly.
Unless advised otherwise, the FRS 24V MASTER switch and the crane MAIN
POWER switch must be in the ON position for all voltage checks.
Test 1.
Disconnect remote control cable from remote control hook-up connector on crane
sub-frame. Check for 24 volts between terminal H and known good ground.
If 24 volts are not present, no power is getting to the remote control cable. There is
an open circuit in the black wire between terminal strip positions 1 and 7, or an
open circuit in the violet wire between terminal strip position 7 and the remote
control hook-up, terminal H. Refer to paragraph 3-16 in this manual.
If 24 volts are present, go to Test 2.
REMOTE CONTROL
CONNECTOR
