Section V. DIRECT SUPPORT (INTERMEDIATE) TESTING PROCEDURE

(2) Connect the appropriate leads (identified by

attached) to the enclosure. Remove the PC board.

tags) to terminals on terminal boards TB1 and TB2.

d. Receiver PC Board Installation (fig. C-3).

NOTE

(1) Orient the PC board so that the terminal

Readjust the processor SENSITIVITY control and the

board (TB1) is adjacent to the conduit entrance.

receiver GAIN control as outlined in paragraph 2-14.

Secure the PC board to the enclosure using four 6-32

(3) Secure the cover to the enclosure using two

x 3/8 inch long screws.

6-32 x 3/8 inch long screws.

(2) Connect the appropriate leads (identified by

c. Receiver PC Board Removal (fig. C-3).

tags) to terminals on terminal board TB1.

(1) Remove and retain the two 6-32 x 3/8 inch

NOTE

long screws fastening the cover to the enclosure.

Readjust the processor SENSITIVITY control and the

(2) Tag, identify, and remove the leads from

receiver GAIN control as outlined in paragraph 2-14.

terminal board TB1.

(3) Secure the cover to the enclosure using two

(3) Remove and retain the fourt 6-32 x 3/8 inch

6-32 x 3/8 inch long screws.

long screws fastening the PC board (microphone

Section V.

DIRECT SUPPORT (INTERMEDIATE)

TESTING PROCEDURE

7-10. General

standards required for the determination of the

These testing procedures are prepared for use by

serviceability of assemblies maintained at the direct

electronic field maintenance ships and electronic

support (intermediate) category of maintenance.

service organizations responsible for direct support

NOTE

(intermediate maintenance of electronic equipment).

These procedures set forth the specific requirements

When performing the procedures disconnect all test

that repaired electronic equipment must meet before

equipment at the completion of each step with the

exception of the power supply. Set the power supply to

it is returned to the using organization.

off when connecting and disconnecting test setups.

7-11. Performance Test Procedures

When connecting an audio generator to circuit points,

Chart 7-2 establishes the minimum performance

always isolate the signal lead with a .1 mfd capacitor.

Chart 7-2. Processor/Receiver Ultrasonic Passive Signal Performance Test Procedure.

Performance standard

Test procedures

Test equipment

Step

Note: Interconnect receiver

to processor. Connect the ap-

propriate jumpers on TB3 to

insert the band rejection filter.

Insure a SYNC pulse is applied

from a processor/transceiver

ultrasonic motion signal.

Set power supply for 20 Vdc

Connect positive lead to ter-

Power supply

minal 7 and negative lead

to terminal 8 of TB1.

Connect between test point

a. Oscilloscope

TP2 and signal ground.

Connect between the junction

b. Audio Generator.

of R2 and R3 (receiver) and

signal ground.

Input level shall be 0.7 millivolts 3db

a. Set the audio generator

for 22 kHz with 1.2 volts

RMS indication at TP2 on

the oscilloscope.

Scope presentation indicates an output

b. Manually sweep the fre-

of 1.2 V 3db.

quency from 20 to 30

Note: A notch will be observed at 26.3 kHz where the

kHz.

output reduces to near zero.

7-5