32.
Release the LAMP TEST button S7.
33.
Set the power switch to on.
34.
Proceed to the low voltage power test.
END OF TEST
When you complete the initial test setup, the procedure directs you to the
next test, the low voltage power test.
You continue to perform the test
procedures in the sequence indicated, until all tests pass.
b. Low Voltage Power Test.
The low voltage power test verifies that
the +24 V power is input to the LD/R and that the LVPS produces the +24
FILTER, +15 V, -15 V, and +5 V outputs within the specifications. This test
also checks the operation of the POWER switch A1W2S3, as well as the
operation of the external fan B1.
Refer to appendix B for the step-by-step procedures for the low voltage
power test.
The procedures follow the format described earlier in this
lesson.
If a malfunction occurs, the test procedure directs you to the
troubleshooting chart, also in appendix B.
Upon completion of troubleshooting and repair, the troubleshooting table
returns you to the test procedures.
Rerun the test procedures in their
entirety.
Appendix B also contains the step-by-step test and troubleshooting
procedures for the receiver test (discussed later in this lesson).
TM 9-
1260-477-34-2 lists the step-by-step procedures for the remainder of the
tests and troubleshooting tables.
c. Display Test.
The display test checks the proper illumination of
the LD/R displays and indicators.
The test checks the operation of the
DISPLAY BRIGHT control A1W2R2, display test circuitry, RETICLE BRIGHT
potentiometer A1W2R1, reticle assembly A2A1A1, and the DMD FIRE CMD line.
The test produces the necessary signals to illuminate the appropriate
displays and indicators to eliminate the possibility of lamp failure during
the remaining test and troubleshooting procedures.
d. Overtemperature Test.
The overtemperature test verifies that no
overtemperature condition exists in the LD/R. The test checks the operation
of the internal and external thermistors
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