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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_252
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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_254


TM  11-5820-890-20-2 4-11 4.2. TROUBLESHOOTING FLOWCHARTS. Continued CHART 1 RCU DISPLAY READS •OPEN" DURING SELF TEST. (Sheet 7 of 8) 1.   IF RCU-A, THEN REMOVE FIELD WIRE FROM RCU VAA E1A AND E2A TERMINALS. 2.   IF RCU-B, THEN REMOVE FIELD WIRE FROM RCU VAA E1B AND E2B TERMINALS. 3.   IF PSA IS PRESENT, THEN REMOVE FIELD WIRE FROM RCU PSA E1 AND E2 TERMINALS. 4.   SET UP DIGITAL MULTIMETER AS AN AC VOLTMETER AT THE 2 V ac RANGE AND SET PEAK HOLD TO ON. 5.   IF VAA IS PRESENT, CONNECT PROBES TO RCU VAA TERMINALS E1A AND E2A, OR E1B AND E2B. GROUND LEAD CAN BE PLACED AT EITHER TERMINAL. 6.   IF PSA IS PRESENT, CONNECT PROBES TO RCU PSA TERMINALS E1 AND E2. 7.   RESET RCU AS FOLLOWS: COMSEC:    CT FCTN:    TST 8.   OBSERVE AC VOLTMETER WHEN RCU DISPLAY READS OPEN. 7 SH 8 NO YES AC VOLTMETER READS GREATER THAN 0.7 V ac ? REPLACE FIELD WIRE. 5 SH 7


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