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
Check DS3.
SELECTOR A switch to C11
15
MCP
WARNING
DANGEROUS VOLTAGES
Observe a reading of +15.00 + 0.75 Vdc.
16
DMM
are used in the operation of this equipment.
//////// DEATH ON CONTACT ////////
Check CR25 through CR28 and C12.
may result if personnel fail to observe safety
precautions. Observe discharge steps before
17
MCP
SELECTOR A switch to C14.
troubleshooting unit.
CAUTION
18
DMM
Observe a reading of +6.600 + 0.330 Vdc.
Do not remove connector from target source while
Check CR18, CRl9, and C9.
19
MCP
it is operating. Contact arcing may result.
SELECTOR A switch to C12.
Observe that CB1 remains in the ON position, and the current from
9
PMS
20
DMM
the external power supply does not exceed 50 amps.
Observe a reading of -6.600 + 0.330 Vdc.
Refer to TM 9-6920-483-34-2
Check CR17, CR20, and C10.
21
MCP
SELECTOR A switch to C10.
SELECTOR A switch to C1.
10
MCP
Readjust the external power supply to +24.00+ 0.25 Vdc.
22
DMM
11
DMM
Observe a reading of +90.00 + 8.00 Vdc.
Check CB1, CR11 and the external
Check K1-D3 and R4.
power supply.
23
MCP
Observe the blower operation is audible.
SELECTOR A switch to C2.
12
PSM
Refer to TM 9-6920-483-34-2
24
DMM
Observe a reading of +90.00 + 8.00 Vdc.
Observe the blower operation is audible.
Check R22.
13
BTS
Refer to TM 9-6920-483-34-2
25
MCP
SELECTOR A switch to C17.
Observe OPERATING RANGE meter lamp illuminated.
14
PSM
CAUTION
In the following steps, do NOT hold the
LAMP START switch in the ON position
longer than 30 seconds, as equipment
damage will result.
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