TM 55-1905-223-24-14
Table 2-3. Unit Maintenance Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
GYRO COMPASS SYSTEM - Continued
STEP 2. Check to see if POWER lamp is defective.
Replace POWER lamp (para. 2-14a).
STEP 3. Check for power to gyro control and power assembly.
Check IC/ELEX power panel circuit breaker No. 1. Reset.
STEP 4. Check cables and connections for security, kinks, or breaks.
Replace cables. Refer to TM 55-1905-223-24-18.
8. Gyro compass slews when compass caged; CAGED lamp is lit.
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).
9. FOLLOW-UP ALARM lamp lit, slews rapidly when TILT/AZIMUTH switch is operated.
STEP 1. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
10. Compass fails to slew when using TILT/AZIMUTH switch; FOLLOWUP ALARM lamp
not lit.
STEP 1. Check to see if 8 AMP dc fuse is blown.
Replace 8 AMP dc fuse (para. 2-14c).
STEP 3. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
11. FOLLOW-UP ALARM lamp lit, compass does not slew correctly when TILT/AZIMUTH
switch operated.
STEP 1. Check to see if gyro control and power assembly is defective.
Replace gyro control and power assembly (para. 2-13).
12. CACED lamp does not light when compass caged.
STEP 1. Check to see if CAGED lamp is defective.
Replace CAGED lamp (para. 2-14).
2-11
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