M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 2/TASK 1
on the VTM to 66, then, press and release the TEST button. The display on
the VTM should show 0066. If it does not show 0066, troubleshoot the test
set for the symptom VTM DOES NOT DISPLAY 0066, in accordance with TM 9-4910-
751-14-1, chapter 5.
test, set the TEST SELECT switches to 99; then, press and release the TEST
button. The VTM display should flash some numbers and then show PASS. If
the display does not show PASS, troubleshoot the test set for the symptom
VTM DISPLAYS AN ERROR CODE, in accordance with TM 9-4910-751-14-1, chapter
(c) Clearing the Unit.
To clear the unit, first set the TEST
SELECT switches on the VTM to 00, then press and release the TEST button.
Check the display on the SETCOM. The SETCOM display should show STE-M1/FVS
CLEAR UNIT. If it does not, troubleshoot the test set for the symptom SET
COMMUNICATOR DOES NOT DISPLAY STE-M1/FVS CLEAR UNIT, as outlined in TM 9-
4910-751-14-1, chapter 5.
(3) Running Self-Test 666. From this point on, all testing is done
using the SETCOM unit. Continue the self-test by performing the following
The sections of the self-test outlined below have been
titled to assist in identifying the main component
In some cases, components other than
the main component identified in the section title are
being simultaneously tested.
(a) Beginning Self-Test 666.
To begin self-test 666, press the
CLEAR button on the SETCOM. The display should read: ENTER TEST NUMBER. If
the display cannot be cleared (does not read ENTER TEST NUMBER), replace the
VTM, in accordance with the procedures outlined in TM 9-4910-751-14-1. The
faulty VTM must undergo intermediate direct support (IDS) maintenance level
troubleshooting procedures for symptom 25, as outlined in TM 9-4910-751-14-
2, chapter 6.