TM 10-5410-228-24
29. AFT LAMP DOES NOT COME ON Continued.
1
Gain access to terminal blocks TB1 and TB2 in the
forward control panel (see para 2.13.16).
Turn ECV on.
Set LTG/INTERCOM circuit breaker (CB4) to ON.
Test for 24 Vdc across TB1 and TB2 per
Remove connector P1 on cable
Is
assembly 1A4W7 from J1 and
24 Vdc
connector P2 from J14.
present?
Test cable assembly 1A4W7 for
continuity per Fig. 2-47, sheet 8.
Yes
Do a continuity check on the
electrical wiring of the forward
control panel per Appendix F,
Turn system off.
Repair as required.
Gain access to circuit
Yes
breaker CB4 (see para
Does continuity exist?
Set CB4 to ON.
Test for continuity
No
between terminals.
Notify direct support to repair
cable assembly 1A4W7.
Gain access to pan assembly.
Yes
Do a continuity check of the
electrical wiring per Appendix F,
Does continuity exist?
Fig. F-9, sheet 1.
Repair wiring as required.
No
Replace circuit breaker
CB4.
2-99
