TM 11-5820-890-30-4
14-11. OPERATIONAL CHECK. Continued
Step 1. BATTERY TRAY CHECK.
Action
Response
a. Connect equipment as shown in figure 14-1.
a. No response.
b. Remove 28 V lamp from test adapter.
b. No response.
c. Connect DMM test lead (+) to test adapter
c. DMM reading is greater than 200 W.
TEST POINT 7. Connect DMM test lead (-)
If not, the battery tray CCA (12A1A1) is
to test adapter TEST POINT 12. Read DMM.
bad.
d. Install 28 V lamp into test adapter.
d. No response.
e. Disconnect DMM test lead (+) from test
e. Battery tray lamp (DS1) does not light.
adapter TEST POINT 7.
If it does, go to chart 1.
Set test adapter 28 V: ON.
f. Wait for 30 seconds.
f. DS1 lamp is still not lit. If it is, the
battery tray CCA (12A1A1) is bad.
g. Set DMM to 20 V dc scale.
g. DMM reading is 14 to 16 V dc.
Connect DMM test lead (+) to test adapter
If not, go to chart 2.
TEST POINT 9.
h. Press battery tray switch (S1).
h. DS1 lamp lights. If not, go to chart 3.
i. Disconnect DMM test leads from DMM and
i. DS1 lamp does not light. If it does, the
test adapter. Connect Jumper from test
battery tray CCA (12A1A1) is bad.
adapter TEST POINT 10 to TEST POINT 9.
Press battery tray switch (S1).
j. Disconnect jumper from test adapter TEST
j. DMM reading is 14 to 16 V dc.
POINT 10 to TEST POINT 9.
If not, the wire from battery tray CCA-
Connect W1 cable to DMM.
E16 to J1-E, or connector J1, is bad.
k. Disconnect W1 cable from DMM. Connect
k. No response.
test leads to DMM. Connect (+) test lead to
test adapter POWER +. Connect (-) test
lead to test adapter POWER -.
l. Adjust power supply for output voltage
l. DMM reading is 1.5 to 2.5 V dc.
of 2.0 V dc (1.5 to 2.5 V de). Read DMM.
m. Disconnect test leads from DMM and test
m. DMM reading is -0.1 to +0.1 V dc. If not,
adapter. Connect W1 cable to DMM.
the battery tray CCA (12A1A1) is bad.
Set DMM to 20 V dc scale. Read DMM.
n. Operational Check is complete.
14-5
