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TM 11-5820-890-30-5
4-9.
OPERATIONAL CHECK. Continued
Step 1a. INPUT POWER CHECK FOR AM-7239/VRC.
Action
Response
a. Set DMM on 2 k W range.
a. If a short is present, diode 5A3CR6 is bad.
Disconnect W5P2 from 5A3P1.
This diode is connected between 5A3K1-X2
Use DMM with test leads to check for
and 5A3K1-X1.
short from 5A3P1-E to 5A3P1-A (GND).
b. Connect equipment as shown in figure 4-2.
b. No response.
c. Set DMM to read 25 to 29 V dc.
c. No response.
d. Set 28 V: ON.
d. Lamp DS1 lights. If not, go to chart 1. If
Set CB1: ON.
CB1 trips to OFF, go to chart 2. The DMM
Read DMM.
reading is 0 V dc. If a voltage is present,
relay 5A3K1 is bad,
CAUTION
See removal and replacement procedures
for two versions of relay K1.
e. Use a jumper cable to connect TEST
e. CB1 stays ON. If CB1 trips to OFF, go to
POINT 5 to TEST POINT 4. Read DMM.
chart 3. The DMM reading is 25 to 29 V
dc. If not, go to chart 4.
Step 1 b. INPUT POWER CHECK FOR AM-7239B/VRC.
Action
Response
a. Set S1: RMT.
a. No response.
b. Set DMM on 2 k W range.
b. If a short is present, diode 5A3CR6 is bad.
Disconnect W5P2 from 5A3P1.
This diode is connected between 5A3K1-X2
Use DMM with test leads to check for
and 5A3K1-X1.
short from 5A3P1-E to 5A3P1-A (GND).
c. Connect equipment as shown in figure 4-2.
c. No response.
d. Set DMM to read 25 to 29 V dc.
d. No response.
e. Set 28 V: ON.
e. CB1 stays ON. If CB1 trips to OFF, go to
Set CB1: ON.
chart 5. Lamp DS1 lights. If not, go to
chart 6.
f. Read DMM.
f. DMM reading is 25 to 29 V dc. If not,
connector 5A3P1 is bad.
g. Set CB1: OFF.
g. Lamp DS1 turns off. If not, go to chart 7.
Set S1: RMT.
Set CB1: ON.
h. Use a jumper cable to connect TEST
h. DMM reading is 25 to 29 V dc. If not, the
POINT 5 to TEST POINT 4. Read DMM.
wire from 5A3P1-E to 5A3S1-2, or connec-
tor 5A3P1, is bad.
4-7
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