Table 2-1. Control-Interface Unit Controls. Indicators, and Connectors

TM 11-6625-2937-13

Control, indicator, or connector

Function

POWER ON/OFF switch

In ON position, ac power is applied and control-interface unit is turned on. In OFF position,

control-interface unit is turned off.

POWER ON indicator

Lights (red) when POWER ON/OFF switch is placed in ON position to indicate presence of ac

power.

ELAPSED TIM meter

Indicates number of hours that control-interface unit has been in operation.

MODE SELECT switch

Six-position rotary switch that switches necessary input power to encoder or during

unit tests and input power to microprocessor or standard logic cards during card tests. Switch

positions are as follows:

POWER OFF: No input power is applied to UNIT TEST POWER or MODULE TEST con-

nectors.

ENC UNIT TEST: Power is applied to the UNIT TEST POWER connector for encoder unit

testing

DEC UNIT TEST: Power is applied to UNIT TEST POWER connector for decoder unit

testing.

ENC MODULE TEST: Power is applied to MODULE TEST connector for encoder micro-

processor or standard logic card test (as applicable).

DEC MODULE TEST: Power is applied to the MODULE TEST connector for decoder

microprocessor or standard logic card test (as applicable).

STE MODULE TEST: Power is applied to the MODULE TEST connector for control-inter-

face unit microprocessor or standard logic card test (as applicable).

MODE IN ERROR indicator

Pulses (yellow) if MODE SELECT switch is placed in wrong position for a particular test (e.g.,

decoder microprocessor or standard logic card prepared for test with MODE SELECT switch

in DEC UNIT TEST position).

MODE/POWER UNIT TEST ON indicator

Lights (green) when MODE SELECT switch is in ENC UNIT TEST or DEC UNIT TEST

position.

MODE/POWER MODULE TEST ON indicator

Lights (green) when MODE SELECT switch is in ENC MODULE TEST, DEC MODULE

TEST or STE MODULE TEST.

MODE/POWER SHORT indicator

Lights (red) during an ENC MODULE TEST, STE MODULE TEST or DEC MODULE

TEST when a power problem is detected.

TEST NUMBER ON indicator

Lights (white) when a program card test is being run and goes out at completion of test.

TESTNUMBER display

Provides three-digit display of particular program card test being run. Also, provides fault loca-

tion information when control-interface unit BITE test is being run.

UNIT TEST POWER connector

Provides interface, between encoder or decoder and control-interface unit.

MODULE TEST connector

Provides interface between control-interface unit and microprocessor or standard logic cards.

AN/UYM-7 connector

Provides interface between control-interface unit and digital tester.

MODULE TEST circuit card rack

Provides connectors for encoder, decoder and control-interface unit, microprocessor and.

standard logic cards, to control-interface unit.

Power input connector J12

Provides for connecting line power to control-interface unit.

Circuit breaker CB1

Pushbutton (push-to-reset) 3-phaae circuit breaker in 115-volt ac, 4O0-Hz, 3-phase input line.

Interrupts current in excess of five amperes.

b. Digital Tester (fig. 2-4). The digital tester

connectors The controls, indicators, and connectors

are shown in figure 2-4 and described in table 2-2.

has both front and rear panel controls, indicators, and

Table 2-2. Digital Tester Controls. indicators, and Connectors

Control, indicator, or connector

Function

POWER switch-indicator

In up position, digital tester is turned on and red indicator is on. In down position, digital tester

is turned off and red indicator is off.

UUT POWER switch-indicator

In up position, dc power is applied through interface connector to the control-interface unit for

microprocessor or standard logic cards under test and indicator lights red In down position,

no dc power is applied to cards and indicator is out.

TEST switch-indicator (two switches)

Pressing either of these momentary switches to down position initiates complete test sequence.

Red indicator is on while test is in progress. Pressing either TEST switch to up -100 initi-

ates tester front panel lamp test.

RECYCLE TEST switch- indicator

Pressing this momentary switch to down position initiates complete test sequence that is repeated con-

tinuously with a delay of approximately 3 seconds between test sequence. Red indicator is

on during recycle mode. Pressing TEST, RECYCLE TEST or CONT TEST switch-indicator

to down position stops recycle mode.

CONT TEST switch-indicator

Pressing this momentary switch to down position places digital tester in continuous test mode.

In this mode, red indicator is on and digital tester continuously generates test signals regard-

less of number of tests selected Pressing TEST, CONT TEST, or RECYCLE TEST switch-

indicator to down position stops continuous test mode.

PROBE connector

Provides interface between logic probe and digital tester.

2-6