Quantcast Table 2-7. Troubleshooting of Battery Power Supply PP-6607/VVG-1 (A78)

 

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Figure 2-13. 9995 signal.
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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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Table 2-7. Troubleshooting of Battery Power Supply PP-6607/VVG-1 (A78) - Continued - TM-9-1240-369-340046
TM 9-1240-369-34
Table 2-7. Troubleshooting of Battery Power Supply PP-6607/VVG-1 (A78)
Item
No.
Malfunction
Probable cause
Corrective action
WARNING
Ensure that power is off when installing or removing units in hot-mock-up, or installing or removing
components or assemblies in units. The storage battery assembly A78B1 can supply enough short-circuit
current to generate temperatures high enough to cause metal to fuse together, and also cause severe burns
to the human body. When handling the battery assembly remove all rings front fingers and do not insert
metal objects into the immediate area of the battery assembly.
NOTE
Extender card test points are connected to corresponding circuit card pin numbers.
1
When LASER MODE CONTROL
Power control electronic component.
1.
Install failed unit in hot mock-up.
switch (unit A79) is turned to
assembly card A78A2. Or A78
2.
Perform portion of Checkout
TEST or ON position, no
unit
(para 4-2a or 4-2b) which will
switches or indicators (unit
duplicate malfunction
A75, or A79) illuminate.
3.  Remove A78A2 card (para 3-7b).
4.  Install extender card (15, table 2-2).
5.  Insert A78A2 card into extender card
connector.
6.  Perform step 2 and continue with step
7.
7.  Using multimeter, measure voltage at
pin 17 of A78A2 card. If multimeter
indicates +24.0 1.0 V, return A78 unit
to depot for repair. If multimeter does
not indicate +24.0 1.0 V, continue
with step 8.
8.  Using multimeter, measure voltage at
pin 25 of A78A2 card. If multimeter
indicates +24.0 1.0 V, replace A78A2
card and continue with step 9. If
multimeter indicates +0.2 0.2 V,
return A78 unit to depot for repair.
9.  Remove extender card.
10. Install A78A2 card (para 3-7b).
11. Remove unit from hot mock-up.
12. Purge unit (TM 9-2350-230-12).
2
A "1"' is displayed on the right
Battery charge sensor circuit card
1.  Install failed unit into hot mock-
hand RANGE (METERS)
assembly A78A3, charge control
up.
indicator (unit A79).
circuit card assembly A78A4
2.  Perform portion of BIT (para 4-2a)
power control circuit card
unit which will duplicate malfunction.
assembly A78A2, or A78
3.  Remove A78A3 card (para 3-7b)
4.  install extender card (13, table 2-2).
5.  Insert A78A3 card into extender card
connector.
6.  Perform step 2 and continue with step
7.
2-27

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