AC HEATER CONTROL PANEL LIGHTS DO NOT OPERATE - continued

DRAFT

TB 9-2320-364-13&P-1

AC HEATER CONTROL PANEL LIGHTS DO NOT OPERATE - Continued

WARNING

Remove rings, bracelets, wristwatches, neck chains, and any other jewelry before working around

vehicle. Jewelry can catch on equipment and cause serious injury. Jewelry or tools may short

across electrical circuits or terminals and cause damage to equipment or severe burns or

electrical shock to personnel.

VISUAL INSPECTION

(1) Turn engine start switch OFF (TM 9-2320-364-10).

(2) Remove eight screws and heater compartment

access panel (TM 9-2320-364-20).

(3) Turn engine start switch ON (TM 9-2320-364-10).

NOTE: Optic ribbon light source operation is verified by

looking for light at the optic ribbon light source ports.

(4) Verify operation of optic ribbon light source.

(a) If optic ribbon light source does not illuminate,

go to Step 3 of this fault.

(b) If optic ribbon light source illuminates, go to

Step 5 of this fault.

VOLTAGE TEST

(1) Turn engine start switch OFF (TM 9-2320-364-10).

NOTE: Do not disconnect wire or optic ribbon from

optic ribbon light source in Step 2.

(2) Remove optic ribbon light source (WP 0042).

(3) Remove lamp socket and lamp from optic ribbon

light source (WP 0043).

CAUTION: Do not twist lamp while removing it from

lamp socket. Pull lamp straight out. Failure to comply

may cause damage to equipment.

(4) Remove lamp from lamp socket (WP 0043).

(5) Turn engine start switch ON (TM 9-2320-364-10).

(6) Place positive (+) probe of multimeter on cab

harness wire 1052/optic ribbon light source power

wire at optic ribbon light source lamp socket.

(7) Place negative (-) probe of multimeter on a known

good ground.

(a) If 12 to 14 vdc are not measured, turn engine

start switch OFF and repair cab harness wire

1052/optic ribbon light source power wire (see

Appendix A) or notify Supervisor. Verify repair,

go to Step 6 of this fault.

(b) If 22 to 28 vdc are measured, turn engine start

switch OFF, and go to Step 4 of this fault.

PLSAC219