Driver, Discriminator, and Antenna Coupler Tray A5, T rouble Localization Chart

TM 11-6625-847-12

Item

No.

Trouble symptom

Probable trouble

Checks and corrective measures

When INPUT CURRENT

a. Improper seating of input

a. Tighten power connector.

switch is presser, volt-

power connector.

age is read across IN-

b. Defective INPUT CURRENT

b. Higher category repair re-

PUT CURRENT LO

switch.

quired.

test point and ground.

c. Defective fuse---------------------------

c. Replace fuse (para 4-26a).

4-24.

Driver, Discriminator, and Antenna Coupler Tray A5, T rouble Localization Chart

The chart below specifies the performance required to be sure that tray A4 is operational.

Step

Control setting and

Performance standard and

No.

Operation of test

operation of equipment

references

equipment

Note. The AN/PSM-4

is the only piece of test

equipment required for fol-

lowing tests

Remove tray AS from case

2 and secure it to test

Bet.

Insure +27-volt dc pri-

Set test set switches and con-

Para 4-25, item No. 1.

mary power is supplied

trols to setting listed in para-

to test set POWER con-

graph 3-10. Set tray A5

nector.

switches and controls to set-

tings listed in paragraph 3-15.

Set test set POWER switch to

Test set POWER indicator il-

ON, and rotate SERV SEL

luminates.

switch to STBY.

Set tray A5 POWER switch to

Tray A5 POWER, RELAY 1,

ON.

and DRIVER 200 VDC indi-

cators illuminate.

Rotate DRIVER BAND SEL

DRIVER 200 VDC indicator il-

control from 3.25 MC to 15.5

luminates when DRIVER

MC and 29.5 MC.

BAND SEL control is in a de-

tent setting; extinguishes when

rotating (para 4-25, item No.

2).

Connect AN/PCM-6 ac

Set DRIVER TEST SELECTOR

7 + 0.5 volts ac (para 4-25, item

test leads to DRIVER

switch to 1.

No. 3).

test points HI and LO

(located above RELAY

RELAY CONTROL

switch) .

Set DRIVER TEST SELECTOR

switch to 2. Adjust test set

DC VOLTAGE 200 control for

+200-volt de indication on

AN/PSM-6.

Set DRIVER TEST SELECTOR

+27 + 1 volts dc (Para 4-25,

switch to 4.

item No. 4).

Press RELAY 1 through 7 in-

Each RELAY indicator should

dicators.

light when pressed (para

4-25, item No. 5).

Disconnect AN/PSM-6 ---------

Reset all switches and controls

Test set and tray A5 POWER

to positions listed in para-

indicators extinguish.

graphs 3-10 and 3-15.

4-17