Section II. DESCRIPTION AND DATA - TM-11-7010-201-40-50012

TM 11-7010-201-40-5/ET821-AA-MMI-050/E154 MTS/TO 31S5-2TSQ73-2-5

Section II. DESCRIPTION AND DATA

1-7. Description. The MTS test aid is designed for use with Test Set, Electronic Circuit Plug-In Unit TS-3317( )/ TSQ-

73, an item of support equipment for Automatic Message Switching Central AN/TYC-39 and Automatic Telephone

Central Office AN/TTC-39. The MTS test aid provides a convenient, simultaneous display of the logic states of signals

present at connector J7 of the MTS, and is used as a troubleshooting aid in conjunction with the MTS. (For a complete

description of the MTS, refer to TM 11-7010-201-12.)

The MTS test aid consists of a chassis assembly and a cable assembly. The chassis assembly is an aluminum alloy

enclosure with a hinged front panel, circuit board assembly, and connector receptacle. The front panel contains switches

and indicator lamps used for operation of the MTS test aid. The circuit board assembly is mounted inside the chassis

and contains integrated circuits and electrical components that are interconnected with the front panel and connector

receptacle. A cover on the bottom of the chassis provides access to the MTS test aid interior for maintenance purposes.

Two binding posts mounted on the side of the MTS test aid are provided for connecting an external 5v power supply.

The cable assembly consists of two 260-pin connectors wired pin-to-pin and is used to connect the TMS test aid to the

MTS.

The MTS test aid provides a visual display of the status of various counters, decoders, and other logic elements of the

MTS. It also simultaneously displays the status of 72 logic lines from the MTS. Three different sets of 72 logic lines

each are selectable for display by setting a front panel switch. The information displayed by the MTS test aid indicators

provides data for use when troubleshooting the MTS, a circuit card under test, or when isolating wiring problems.

The MTS test aid is powered from the MTS during normal operation. However, for functional testing of the MTS test aid,

5 vdc at 5 amperes is required.

1-8. Technical Characteristics.

a. Power Requirements.

(1) Five volts DC is supplied to the test aid by the MTS during normal operation.

(2) When the test aid is being functionally tested, input power from an auxiliary 5-vdc source is required.

b. Physical Characteristics.

(1) Test Aid Assembly

Height: 5.5 inches

Width: 15.0 inches

Depth: 10.25 inches

Weight: 5 pounds

(2) Cable Assembly

Length: 2 feet

Weight: 5 pounds

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