LEFT/RIGHT MAP LIGHT ON FORWARD CONTROL PANEL DOES NOT COME ON.

TM 10-5410-228-24

27. LEFT/RIGHT MAP LIGHT ON FORWARD CONTROL PANEL DOES NOT COME ON.

Test bulb.

Replace bulb

Is bulb good?

(reference TM 10-

5410-228-10).

Yes

Gain access to map light

Remove lit bulb.

Set LTG/INTERCOM circuit

breaker (CB4) to OFF.

Test for continuity across

terminals of switch that has the

non-lighting bulb.

Gain access to terminal blocks TB1 and TB2 in

the forward control panel.

Turn ECV on.

Yes

Set LTG/INTERCOM circuit breaker (CB4) to

Does continuity exist?

ON.

Test for 24 Vdc across TB1 and TB2 per

Replace switch.

Set LTG/INTERCOM circuit breaker

(CB4) to OFF.

Remove connector J3 on cable

24 Vdc

assembly 1A4W7 from P3 and

present?

connector P2 from J14 on rear control

panel.

Yes

Test cable assembly 1A4W7 for

continuity per Fig. 2-47, sheet 8.

Do a continuity check on the

electrical wiring of the forward

control panel per Appendix F,

Repair wiring as required.