Section II. TROUBLESHOOTING - TM-11-5895-217-120036

Section II. TROUBLESHOOTING

42. General

note the item number and turn to the

Troubleshooting of this equipment is

c o r r e s p o n d i n g item number in the trouble-

based on the operational check contained

shooting chart (para 43). Perform the

in the periodic maintenance and service

c h e c k s and corrective actions in the trou-

inspection

chart

(para

41,

item

No.

b l e s h o o t i n g chart. If the corrective meas-

through 22). To troubleshoot the equip-

u r e s indicated do not result in correction

ment, perform all functions starting with

o f the trouble, higher echelon maintenance

item number 8 (para 41) and proceed

is required.

t h r o u g h the items until an abnormal con-

dition or result is observed. When an

43. Troubleshooting Chart

abnormal condition or result is observed.

Item

Trouble

Symptom

Probable

trouble

Checks and corrective measures

No.

a. Aircraft circuit breaker open; a. Check for 28 volts dc at circuit

Pilot light is not illuminated.

faulty intercomponent wiring.

breaker. Check continuity of

aircraft wiring (refer to ap-

plicable aircraft technical

manual).

b. Check fuse, replace if defect-

b. Defective fuse.

ive.

c. Check pilot light for proper

c. Pilot light loose in socket or

burned out.

replace if necessary.

d. Defective control unit master

d. Replace control unit (para 45).

control switch.

a. Replace control unit (para 45).

Appropriate flags do not appear on a. Defective control unit.

b. Replace receiver-transmitter

b. Defective receiver-transmitter.

through the transponder test set.

(para 44).

c. Defective antenna or antenna

C. Replace antenna (pars 48). Check

cable.

antenna cable continuity; re-

place if defective.

44. Removal and Replacement of

injector-ejector groove; remove

Receiver-Transmitter

the receiver-transmitter from the

a. Removal.

mounting.

b. Replacement.

(1) Remove the antenna cable from

(1) P o s i t i o n t h e r e c e i v e r - t r a n s m i t t e r

A N T E N N A jack (fig. 7).

o n the mounting and slide it to the

(2) C u t a n d r e m o v e t h e s a f e t y w i r e

rear until the holddown pins (fig.

a n d loosen the holddown clamps on

5 ) on the rear of the mounting en-

t h e front of the mounting (fig. 5)

g a g e the guide holes at the rear of

and disengage the clamps from the

the receiver-transmitter. Do not

holddown hooks on the receiver-

e n g a g e the mating connections.

transmitter (fig. 2).

(2) L i f t the front end of the receiver-

(3) T u r n t h e k n o b o f t h e i n j e c t o r -

transmitter by the handle (fig. 2)

e j e c t o r mechanism (fig. 5) counter-

slightly and match the lip of the

clockwise

until

the

receiver-

case with the groove of the

transmitter has been moved far

i n j e c t o r - e j e c t o r mechanism

e n o u g h to disengage the holddown

(fig. 5).

pins.

(3) L o w e r t h e r e c e i v e r - t r a n s m i t t e r ,

Lift the receiver-transmitter front

with the lip and groove engaged,

e n d by the handle (fig. 2) to clear

and turn the injector-ejector

the

front

panel

lip

from

the