TM 10-4610-241-24
TO 40W4-13-42
Table 3-1. Direct Support Troubleshooting-continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
CONTROL BOX ASSEMBLY - continued
ROWPU FAILS LAMP TEST (Models WPES-20 and H-9518-2).
Step 1. Refer to circuit diagram and perform a point-to-point continuity test of ground circuit. Pins Jl and J10(N)
to lights and X1 of relays.
If open, replace wires or cable assembly, W52. Refer to Paragraph 3-27.
Step 2.
With S11 closed, perform point-to-point continuity test of power circuit from J10(C) to relay coils X2 and
contacts A1, B1, C1, D1 and E1 (K10 only) of relays.
a.
If circuit breaker, CB9 is open (CB9 ON), replace it. Refer to Paragraph 3-53.
b.
If switch, S11 is open (switch ON), replace it. Refer to Paragraph 3-49.
c.
If cable assembly, W52 is open, repair cable assembly. Refer to Paragraph 3-27.
d.
If wires are open, tighten loose connections and/or replace defective wire.
Step 3.
Momentarily apply power and note which lights are inoperable.
a.
If DS1 through DS5 are inoperable, replace relay, K10. Refer to Paragraph 3-49.
b.
If DS6 through DS9 are inoperable, replace relay, K11. Refer to Paragraph 3-49.
Step4.
Perform continuity test between relays, K10, K11 as appropriate and defective light. If wires are loose or
defective, tighten loose wires or replace defective wires.
3-36 Change 1
