M2/M3 BFV: HULL POWER DIST SYSTEM - OD1606 - LESSON 2/PE 2
LESSON 2.
PRACTICAL EXERCISE - ANSWERS
a.
The four steps that outline troubleshooting are:
(1)
Verify that the problem exists
(2)
Isolate the fault
(3)
Correct the fault
(4) Verify that the problem no longer exists and that there are
no additional problems
b.
When corrective action has been completed, it is essential to
verify that the malfunction has been corrected.
Often, this means
returning to the beginning of the troubleshooting procedure and
repeating the procedure to ensure that everything is working
correctly.
Test operation should also determine whether the fault
has been corrected. Once sure that the malfunction no longer exists,
the repairs must be annotated on DA Form 2404 in accordance with DA
Pam 738-750.
Occasionally, the defective component can be replaced
or repaired only by a higher level of maintenance.
In this case,
careful annotation should be made on DA Form 2404 so that it is clear
which repair should be made.
c.
There are two confidence tests that must be performed.
The
first, confidence test 66, is performed by setting the TEST SELECT
switches on the VTM to 66. Then press and release the TEST button.
The display on the VTM should show 0066. Once this display has been
received, perform confidence test 99.
This is done by setting the
TEST SELECT switches to 99. Then press and release the TEST button.
The VTM display should flash some numbers and then display the word
PASS. If the display does not show 0066 or does not display the word
PASS, troubleshoot the VTM using the STE-M1/FVS (VTM only) confidence
test diagnostic troubleshooting procedures on page 3-910 of TM 9-
2350-252-20-1-1.
d.
To perform a zero adjust, first, set the range switch to the
desired range of ohms position.
Then plug the black lead into the
ohms -DC AC jack.
Now put the red lead into the left ohms jack.
With the leads connected, place the FUNCTION switch to
68
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