TM9-4935-481-14-1 C3
Table 3-19. LET Performance Test-Continued
EQUIPMENT NOTES
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
80
PPE
Momentarily actuate TEST START switch.
81
TPS
Momentarily actuate TRIGGER switch and observe a 675 + 100 msec
OSC
wide, +15 to +18 Vdc pulse.
82
LET
Raise fully upright the breech block assembly and allow it to
remain upright.
83
OSC
Observe a 675 100 m sec wide, +15 to +18 Vdc pulse when the
TPS
TRIGGER switch is momentarily actuated.
84
DMM
Observe a reading of < 0.5000 Vdc.
85
LET
Lower and lock the breech block assembly.
86
PP
Momentarily actuate TEST START switch.
87
TPS
Momentarily actuate the TRIGGER switch.
88
Disconnect and stow the 1W12 and 1W3 cables.
89
Disconnect and stow all leads from the counter and oscilloscope.
90
MCP
DMM FUNCTION switch to K OHMS.
91
MCP
DMM LO switch to EXT.
92
MCP
DMM INPUT switch to DMM INPUT.
93
Perform a complete continuity check of all cabling by monitoring
with the DMM probes from lW4-P1 to J1 on the front of the LET
utilizing the D[S-D/LET interface diagram figure 3-37 and the
LET schematic in TM 9-1425-484-24.
94
PP
MAIN POWER and DMS switches to OFF.
95
Remove and stow all test leads and accessories.
96
Remove the reversed batteries installed in step 60 and re-install
in the proper direction per the polarity diagram in the tube.
3-322