Test Set Internal Functions

TM 9-4931-381-14&P-1

e. Test Set/Unit Under Test (UUT) Cable Connections. Figure 2-1 shows the test

cable connections for testing the TIS and TTS assemblies. Power cable W10 is connected from

test set connector J13 to the external power supply. This cable remains connected throughout

all testing. Although figure 2-1 shows all eight UUT connected, only one can be tested at a

time. The test set MESSAGE DISPLAY wilI telI you when to connect each cable and which jack

to connect it to. It is important that the shorting plugs be installed on the jacks when the jacks

are not being used. (Three jacks J3, J10, and J13 do not have shorting plugs.) The test set wilI

not work unless the plugs are installed.

Test Set Internal Functions. Figure FO-I in the back of this manual is a block diagram

2-2.

that shows the internal functions of the test set. These functions are as follows:

Power Supply Function. Four internal power supplies convert the external power

to other regulated voltages required by the test set modules. When the TEST SET POWER

switch is set to ON, external power is supplied to the internal power supplies.

Digital Subsystem (DSS). The DSS contains a microprocessor that performs

scanner switching, computer functions, and stimuli setup.

Image Display Function. The image display function simulates the M1 tank ICU

display.

Power Control Unit Simulation Function. The power control unit simulation

function in the test set is identical to the PCU in the M1 tank.

Electronics Unit Simulation Function. The electronics unit simulation function in

the test set is identical to the EU in the M1 tank.

TTS Test Function. Used to run tests of the M60A3 tank:

Head assembly

(1)

Gunner's display unit

(2)

Power converter unit

(3)

Commander's display unit

(4)

TIS Test Function. Used to run tests of the M1 tank:

Image control unit

(1)

Electronics unit

(2)

Power control unit

(3)

Thermal receiver unit

(4)

Message Display. The MESSAGE DISPLAY can display 80 alphanumeric

characters. The message is displayed on 2 lines, 40 characters per line.

Volume 1

Para. 2-2

2-4