TM 9-4120-402-14
4-40. COMPRESSOR START RELAY (K2), DIODE (CR3), AND SURGE ARRESTOR (SA1).
-continued
b. Inspect.
Check general condition of relay (5), diode (9), and surge arrestor (10) and that terminals are not broken or
missing. Replace if damaged..
c. Test.
(1) Compressor start relay (5).
(a) Apply 28VDC to terminals X1 (positive) and X2 (negative).
(b) Check continuity across terminals Al and A2; B1 and B2, and C1 and C2. The multimeter must show
that contacts are closed (continuity).
(c) Remove power. Multimeter must show that contacts are open (no continuity).
Figure 4-41. Compressor Start Relay (K2), Diode (CR3), and Surge Arrestor (SA1)
4-119