TM9-4120-400-14
4-31.
RELAYS K2 and K3. - continued
Figure 4-26. Relay K2 and K3
INSPECTION
Check relays for general condition, evidence of overheating, and loose, broken, or missing terminals.
TESTING
1. Apply 28VDC to terminals X1 (positive) and X2 (negative).
2. Check continuity across terminals A1 and A2, B1 and B2, and C1 and C2. The multimeter must show that
contacts are closed.
3. Remove power. Multimeter must show that contacts are open.
4. Replace relay if defective.
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