TM 55-1905-223-24-14
Table 2-3. Unit Maintenance Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
GYRO COMPASS SYSTEM - Continued
13. Cyro motor will not start.
STEP 1. Check cable C-LC12 for security and condition.
Replace cable (para. 2-14d.).
STEP 2. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
14. Gyro motor does not come up to full speed.
STEP 1. Check to see if gyro compass is defective.
Replace gyro compass (para. 2-12).
STEP 2. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
15. Gyro control and power assembly level meter does not indicate level.
STEP 1. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
STEP 2. Check to see if gyro compass is defective.
Replace gyro compass (para. 2-12).
16. Gyro control and power assembly level meter does not change when TILT/AZIMUTH
switch is operated (maintains fixed deflection).
STEP 1. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
STEP 2. Check to see if gyro compass is defective.
Replace gyro compass (para. 2-12).
17. Compass does not offset when TILT/AZIMUTH switch is operated; follow-up
normal. I
STEP 1. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
18. Compass slews rapidly when uncaged; level meter full scale.
STEP 1. Check to see if gyro compass is defective.
Replace gyro compass (para. 2-12).
2-12
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