Quantcast Figure 2-25. Removal of ECU panel assembly.

 

Click here to make tpub.com your Home Page

Page Title: Figure 2-25. Removal of ECU panel assembly.
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Figure 2-23. Removal of edge-lighted panel.
Up
TM-5-6675-250-34 Survey Instrument Azimuth Gyro Lightweight( Leaser Siegler Inc. Models AG-8 and AG-8A) Manual
Next
Figure 2-26. Removal of MODE and TEST SELECT switch knobs.
TM 5-6675-250-34
Table 2-1. Troubleshooting­Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
CAUTION
To avoid damaging the electrical connectors, alternate tightening each of the two screws during reassembly.
(10). Install printed circuit board, but do not tighten mounting screws. Connect the two electrical
con nectors and secure by tightening two screws. Fasten ten screws that secure printed circuit
board to mounting brackets.
(11). Place edge-lighted panel over connector, seat properly and secure with five mounting screws.
(12). Install BIAS control locking and BIAS knob on switch shaft. Secure BIAS knob by tightening
setscrews.
(13). Install TEST SELECT knob on shaft with pointer at source voltage position. Install MODE
SELECT knob on shaft with pointer at GC position. Secure each knob by tightening setscrews.
(14). Install electronic control panel assembly in case and secure with eight captive screws.
Step 4. Check for defective gyroscopic reference unit. Replace existing GRU with a GRU that is operable by
disconnecting and connecting power cables. If tbe system operates correctly with the new GRU, this indicates
the original GRU was bad. Report a bad GRU to the next higher level of maintenance.
4. PANEL ILLUMINATION CIRCUIT INOPERATIVE
Step 1. Check for a defective panel illumination control (2A2R2) or defective mode select switch (2A2S1).
a. Loosen the eight captive-screws and lift the electronic control panel assembly from the case (fig. 2-25).
TS 006264
Figure 2-25. Removal of ECU panel assembly.
b. Unfasten ten screws securing the printed circuit 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 the input pins of the mode select switch and position pins. Use an
ohm-meter and check continuity between pin 3 and pin 1 and 2 of the panel illumination control.
If continuity is not present, replace a defective mode select switch or panel illumination control.
(1). Place MODE SELECT switch to GC position.
(2). Place TEST SELECT switch to source voltage position.
Change 1, 2-19

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business