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Figure 2-35. Removal of ECU panel assembly.
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TM-5-6675-250-34 Survey Instrument Azimuth Gyro Lightweight( Leaser Siegler Inc. Models AG-8 and AG-8A) Manual
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Figure 2-37. Removal of MODE and TEST SELECT switch knobs.
TM 5-6675-250-34
Table 2-1. Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Figure 2-36. Removal of ECU panel assembly.
b. Unfasten ten screws securing the printed circuit board to mounting brackets and loosen the board to
obtain access to electrical connectors.
CAUTION
To avoid damage to the electrical connectors, alternately back-off each of the two attaching screws when removing the
connectors.
c. Disconnect two electrical connectors (2A2J5 and 2A2J6) by unfastening two screws at each connector.
d. Use an ohmmeter and check continuity between pins 2 and 7 and 3 and 6 of PRESS TO TEST switch while
the switch is closed.
e. Use an ohmmeter and check continuity between pins A, B, C and the position pins of MODE SELECT
switch and TEST SELECT switch.
If continuity is not present, replace a bad switch.
(1). Place MODE SELECT switch (fig. 2-37) to GC position.
(2). Place TEST SELECT switch to source voltage position.
Change 1, 2-29

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