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TM 11-5820-890-20-2
4-9
4.2.
TROUBLESHOOTING FLOWCHARTS. Continued
CHART 1
RCU DISPLAY READS •OPEN" DURING SELF TEST.
(Sheet 5 of 8)
1. IF RT-A, THEN REMOVE FIELD WIRE FROM
RT VAA E1A AND E2A TERMINALS.
2. IF RT-B, THEN REMOVE FIELD WIRE FROM
RT VAA E1B AND E2B TERMINALS.
3. IF PSA IS PRESENT, THEN REMOVE FIELD
WIRE FROM RT 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
RT 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
RT PSA TERMINALS E1 AND E2.
7. PRESS BATT/CALL KEYPAD AND HS PTT.
8. OBSERVE AC VOLTMETER AND RT DISPLAY.
NO
YES
RT DISPLAY
READS
•FAIL 4"
?
REPLACE RT.
6
SH 6
NO
YES
AC VOLTMETER
READS
GREATER THAN
0.7 V ac
?
2
SH 3
3
SH 5
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