Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
CONTROL BOX ASSEMBLY - continued
2. ROWPU FAILS LAMP TEST.
Step 1 Refer to circuit diagram and perform a point-to-point continuity test of ground circuit.
Pins JI/J 10(N) to lights and X of relays
Step 2. With S11 closed, perform point-to-point continuity test of power circuit from JI/J0O(C)
to relay coils X2 and contacts Al, BI, C1, Dl and El (K10 only) of relays
a If circuit breaker, CB9 is open (CB9 ON), replace it. Refer to paragraph 3-49.
b If switch, SI l is open ( switch ON), replace it Refer to paragraph 3-45.
c. If cable assembly, W52 is open, repair cable assembly. Refer to paragraph 3-22.
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 345.
b If DS6 through DS9 are inoperable, replace relay, K11 Refer to paragraph 3-45.
Step 4. Perform continuity test between relays, K10, K 11 as appropriate and defective light.
If wires are loose or defective, tighten loose wires or replace defective wires