TM 55-1905-223-24-14
Table 2-3. Unit Maintenance Troubleshooting
Malfunction
Test or Inspection
Corrective Action
GYRO COMPASS SYSTEM
1. No panel lamps lit on gyro control and power assembly.
STEP 1. Check to see if 8 AMP dc fuse blown.
Replace 8 AMP dc fuse (para. 2-14c).
STEP 2. Check to see if 1 AMP ac fuse is blown.
Replace 1 AMP ac fuse (para. 2-14b).
2. No panel lamps lit, 8 AMP dc fuse good on gyro control and power assembly.
STEP 1. Check to see if POWER lamp is defective.
Replace POWER lamp (para. 2-14a).
3. No panel lamps lit; 8 AMP dc fuse, 1 AMP ac fuse and POWER lamp good on gyro
control and power assembly.
STEP 1. Check to see if input power to gyro control and power assembly is
defective.
Reset pilothouse IC/ELEX panel circuit breaker No. 1.
4. POWER lamp not lit, CAGED lamp lit on gyro control and power assembly.
STEP 1. Check to see if POWER lamp is defective.
Replace power lamp (para. 2-13a).
5. 8 AMP dc fuse continually blows on gyro control and power assembly.
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 cable C-LC12 for security, kinks, breaks, etc.
Replace cable C-LC12 (para. 2-14d.).
6. FOLLOW-UP ALARM lamp lit on gyro control and power assembly.
STEP 1. Verify that system is not on backup power.
Notify supervisor.
7. POWER lamp not lit on gyro control and power assembly.
STEP 1. Check to see if 1 AMP ac fuse is blown.
Replace 1 amp ac fuse (para. 2-14b).
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