Control-Indicator Test Function.

TM 32-5811-024-14&P

5-13. AGE Display.

See table 5-1 and figure FO-8 for a description of AGE display CCA A2.

5-14. Control-Indicator Test Function.

a. General. (See figure FO-15) Control-indicator test CCA A9 tests the communication processor control-indicator.

Two tests may be performed: the first test requires entering a code that lights all indicators on the control-indicator. This

test is activated by setting the digital processor test set CONT. IND. TEST switch to the DISP. position, and pressing the

UPDATE switch. The second test, performed with the digital processor test set CONT. IND. TEST switch in the NORM

position, tests all switches and status indicators, as well as the input and output control logic of the control-indicator. This

test involves setting the control-indicator switches to provide a unique communication processor control-indicator output

status (CIOSTS) word.

When the 32-bit CIOSTS word is serially transferred to CCA A9 as high control-indicator data (HOD), the test

response matrix circuits on CCA A9 convert the input into a 16-bit CIISTS (control-indicator input status) word, which is

serially transferred back into the control-indicator via the HID (high input data) lines. This coded word lights the control-

indicator status lamp selected. The lighting of the appropriate control-indicator status lamp verifies proper operation of

the communication processor control-indicator switches.

b. Detailed Description. Figure FO-6 shows a simplified functional diagram of the control-indicator test circuits of

the digital processor test set. Generally, the 32-bit word, resulting from unit-under-test control-indicator switching, is

serially transferred into control indicator test CCA A9. This data word (CIOSTS) provides a parallel address input to the

test response matrix. The matrix responds to this address input by providing a 1-of-16 coded response word output. The

matrix will drive only 1 of the 16 response word bits high as a result of the 32-bit address input. This response word is

then serially transferred back to the unit-under-test control-indicator, where it will light the appropriate status lamp.

The following is a detailed description of the circuit activity (see figure 5-8 and figure FO-6) that occurs during a

typical test sequence:

(1) Time state T0. Setting UPDATE switch S14 drives the output of IHUD line receiver U35A high. This

positive transition triggers update single-shot U34B. U34B responds by generating a 10- negative pulse. This pulse is

transferred to the logic control circuits of the communication processor control-indicator CCA A2 via line

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