Differences In Models

TM 11-6625-1683-15

1-11. Differences In Models

Test facilities Kit MK-980A/PPS-5 differs from Test

(2) Four access holes have been added to the

Facilities Kit MK-980/PPS-5 as follows:

cover of component board E2 (fig. 7-7) to permit

a. Special Purpose Electrical Cable Assem-

adjustment of potentiometers R46, R48, R50, and

bly CX-12067/U (fig.1-2 ‘ . is added to the accessory

R51 without removing the cover.

kit to permit testing Electrical Headset H-2Sl/U

(3) A plastic protective cover has been added to

(which has a 5-pin connector plug instead of a

cover the back of CRT TEST switch S17 (fig. 7-2) for

telephone plug). Cable CX-12067/U has a S-contact

added safety of maintenance personnel.

receptacle on one end and a telephone plug on the

(4) Component boards El and E2 (figs. 7-3 and

o t h e r , and it serves as an adapter cable for

7-7) are conformal coated to protect the compo-

connecting headset H-251/U to the telephone jack

nents from moisture and fungus.

on the test panel.

(5) Test panel SB-3004A/PPS-5 is secured to

b. Special Purpose Branched Electrical Cable

case CY-6208/PPS-5 with 14 captive screws instead

Assembly CX-10441A/PPS-5 (fig. l-2 ‘ ) replaces

of 16 machine screws.

(6) The block 700 receiver-transmitter power

cable assembly CX-10441/PPS-5. The two cables

are functionally interchangeable, but the con-

converter has no 600-volt output (fig. 9-3).

struction of cable CX-10441A/PPS-5 is an im-

e. Other miscellaneous differences exist between

provement over that of cable CX-10441/PPS-5.

equipment of the same models or between models

c. Special Purpose Electrical Cable Assembly

as a result of modifications or from production

CX-10444A/PPS-5 (fig, 1-2 ‘ ) replaces cable assem-

updates as follows:

bly CX-10444/PPS-5. The female connector of the

(1) Block 700 receiver-transmitter power con-

verters in some equipment include a 6 volt ac

replacement cable is made smaller to fit the block

400 boxcar and audio amplifier in receiver-

output.

(2) AC test points have been installed on the

transmitter RT-695/PPS-5A.

d. Electrical Test Panel SB-3004A/PPS-5 differs

block 100 section of the front panel (fig. 9-10.2) of

some equipment to provide 6-volt ac for testing the

from SB-3004/PPS-5 as follows:

operation of the TR unit solid state local oscillator

(1) The abbreviated names of AN/PPS-5 plug-

in circuits have been added to the test block

(SSLO) on AN/PPS-S, AN/PPS-5A or AN/PPS-5B

so equipped.

numbers on the panel (fig. 9-10.1) to facilitate

identification.

Change 10

1-11