TM 9-4935-481-14-1
Table 3-20. IR Transmitter Performance Test
Table 3-20. IR Transmitter Performance Test-Continued
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
NOTE
MCP
SELECTOR A switch to F1.
35
If the lamp starts, the DMM will indicate +24 Vdc
for approximately 5 seconds only.
DMM
Adjust COMPARATOR THRESHOLD B control to +5.000 +
36
0.050 Vdc. MCP
Momentarily actuate LAMP START switch and observe a reading of
26
PSM
+24.00 + 1.00 Vdc. (Release the switch when reading is obtained).
DSM
37
MCP
SELECTOR B switch to C5.
38
CT
FUNCTION switch to PERIOD A.
Check ST-A and K1-C3.
PSM
27
39
CT
FREQ/TIME/MULT switch to 10
.
CB1 switch to OFF.
PSM
28
40
CT
A INPUT switch to post
CB1 switch to ON.
PSM
29
41
CT
Observe a reading of 200 + 3 SEC
SELECTOR A switch to C15.
PSM
30
Momentarily actuate LAMP START switch.
Check R4 and C1.
42
MCP
CAUTION
SELECTOR A switch to C10.
Do not hold LAMP START switch in ON position
43
MCP
longer than 30 seconds.
DMM LO switch to 5.
DMM
31
44
DMM
Observe a reading of +40.00 + 2.00 Vdc.
Adjust the external power supply to a reading of +21.00+
BTS
32
0.20 Vdc.
Check CR11 through CR24, C11, and
S1B.
45
MCP
SELECTOR A switch to C7.
PSM
33
Observe that the lamp is ON.
46
DMM
Refer to TM 9-6920-483-34-2
Divide the reading by 2.61, and record for use in step 51.
47
MCP
Observe the LAMP MOD indicator has changed from OFF to ON.
SELECTOR A switch to C1.
48
MCP
Check K1-C1, DS1, and R1.
SELECTOR B switch to C2.
MCP
49
MCP
34
DMM LO switch to SYS GND.
DMM LO switch to SEL B.
50
DMM
Multiply the ready by 300, and record for use in step 51.
51
MCP
Subtract the value recorded in step 46 from that recorded in
step 50, and record the result for use in step 56.
52
MCP
DMM LO switch to 5.
53
MCP
SELECTOR B switch to C9.
54
MCP
Connect a cable from J13 to the oscilloscope A input.
3-327