TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
10. NO TRANSIT LIGHT DOES NOT OPERATE PROPERLY (MODEL A ONLY)
(continued).
KNOWN INFO
7.
TEST OPTIONS
NO TRANSIT WHEN LIT
Are 2228 volts mea-
Voltage Test.
indicator bulb never
sured at relay K3,
REASON FOR QUESTION
comes on.
position 86?
NO TRANSIT WHEN LIT
Relay K3 activates the
indicator bulb OK.
NO TRANSIT WHEN LIT
Hook arm down proximity
indicator bulb. When the
switch OK.
relay is closed, the light
Hook arm down proximity
is OFF. When the relay
switch circuit OK.
is open, the light is ON.
POSSIBLE PROBLEMS
Relay No. K3 faulty.
Fault not corrected.
NO
Notify supervisor.
Replace relay
YES
4-178
Change 1
