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Section VIII. REPAIR OF CABLE ASSEMBLIES
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TM-9-1240-369-34 Range Finder Fire Control: (Laser) AN/VVG-1 (1240-00-470-2156) Manual
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Closed Cover Test.
TM 9-1240-369-34
CHAPTER 4
FINAL INSPECTION
(3) Press and hold the TSW switch and observe the
4-1. Scope.
following:
Final inspection is performed after repair has
(a) All lamps on the commander's control unit
been completed to insure serviceability of the laser range
and R/T unit light.
finder according to established standards.  Any items
(b) RANGE  (METERS)  and  RETURNS
containing defects disclosed by the final inspection will
indicators display 8888 and 8, respectively.
be returned to the maintenance shop for repair and
(4) While pressing the TSW switch, press and
adjustment.
release DMR switch twice and observe the following:
(a) All lamps on the commander's control unit
4-2. Checkout.
alternately dim and brighten.
Using the test cables from the special tools and
(b) RANG(E  (METERS)  and  RETURNS
test equipment, make proper interconnection of the
indicators maintain the same brightness.
individual units of the laser range finder as instructed in
(5) Release the TSW switch.  The status of the
paragraph 2-4. Then, follow the procedures in a below
switch lamps will be that of step 2.
for checkout to verify proper operation of the units within
(6) Adjust RTCL ILLUM control on the R/T control
the laser range finder system.
unit and observe that the reticle illumination in the
a. Built-in Test. The laser range finder contains a
receiver-transmitter unit varies.
built-in test (BIT) capability which traces faults to the
(7) Press and release the RANGE switch on R/T
lowest line replaceable unit.
The test consists of
control unit and observe the following:
manipulating the laser range finder controls in a
(a) RANGE RETURN SELECTOR LAST lamp
prescribed sequence while observing that certain lamps
remains lit.
light and certain ranges appear on the readout. Although
(b) RANGE (METERS) indicator displays 84.5
the laser will not be fired while the LASER MODE
+15.
CONTROL switch on the commander's control unit is in
(c) RETURNS indicator displays 1.
the TEST position, the ballistic dust cover should be
(8) Press
and
release
RANGE
RETURN
closed.  This will prevent the exposed optics from
SELECTOR 1 switch and observe the following:
contamination and any eye injury in case the LASER
(a) RANGE RETURN SELECTOR 1 lamp
MODE CONTROL switch is inadvertently turned to the
lights.
ON position.
(b) RANGE RETURN SELECTOR LAST lamp
goes out.
NOTE
(c) RANGE (METERS) indicator displays 845
Unless  otherwise  specified,  all
+15.
switches,  lamps.,  and  readouts
(9) Press
and
release
RANGE
RETURN
mentioned in the following procedure
SELECTOR 2 switch and observe the following:
are on the commander's control unit
(a) RANGE RETURN SELECTOR 1 lamp
(A79).
goes out.
(b) RANGE RETURN SELECTOR 2 lamp
(1) Apply external power to the hot mock-up as
lights.
described in paragraph 2-4. Adjust voltage to 24 +1 V.
(c) RANGE  (METERS)  indicator  displays
(2) Set LASER MODE CONTROL switch to TEST
9995, 9990, or 000.
position and observe the following:
(10) Press
and
release
RANGE
RETURN
(a) LASER MODE CONTROL TEST lamp
SELECTOR LAST switch and observe the following:
lights.
(a) RANGE RETURN SELECTOR 2 lamp
(b) RANGE RETURN SELECTOR LAST lamp
goes out.
lights.
(b) RANGE RETURN SELECTOR LAST lamp
(c) RANGE  (METERS)  and  RETURNS
lights.
indicators display 0000 and 0, respectively.
(c) RANGE METERS indicator displays 845 +
(d) RESET lamp on the R/T control unit lights.
15.
(e) RANGE lamp on the R/T control unit lights
but does not flash on and off.
4-1

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