NO POWER TO SYSTEM WITH `EXT' POWER APPLIED.

TM 10-5410-228-24

2.8

UNIT LEVEL TROUBLESHOOTING PROCEDURES Continued.

14. NO POWER TO SYSTEM WITH `EXT' POWER APPLIED.

Turn external power source OFF.

Gain access to power panel per para 2.13.30.

Set circuit breaker A9CB1 on the power panel

to ON.

Test for continuity across terminals of circuit

breaker.

Replace circuit breaker

Does continuity exist?

A9CB1.

Yes

Gain access to POWER MODE

selector switch S1.

Set switch to EXT.

Refer to section C80 on switch and

test for continuity between pins 1 &

2, pins 5 & 6, and pins 9 & 10.

Replace POWER

MODE selector

Does continuity exist?

switch.

Yes

Remove cable assembly 1A4W13

connector plug P1 from J3.

Apply system power.

Measure 208 Vac between sockets A & B

and B & C of P1.

Turn power off.

Remove cable assembly

1A4W13.

Is 208 Vac present?

Test for continuity per

Yes