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TM 11-5820-890-20-2
4-5
4.2.
TROUBLESHOOTING FLOWCHARTS.
CHART 1
RCU DISPLAY READS •OPEN" DURING SELF TEST.
(Sheet 1 of 8)
1. REMOVE FIELD WIRE FROM RT BATTERY
BOX E1 AND E2 TERMINALS.
2. SET UP DIGITAL MULTIMETER AS AN AC
VOLTMETER AT THE 2 V ac RANGE AND SET
PEAK HOLD TO ON.
3. CONNECT PROBES TO RT BATTERY BOX E1
AND E2 TERMINALS. GROUND LEAD CAN BE
PLACED AT EITHER TERMINAL.
4. PRESS CALL KEYPAD AND HS PTT.
5. OBSERVE AC VOLTMETER AND RT DISPLAY.
NO
YES
RT DISPLAY
READS
•FAIL 4"
?
NO
YES
DISMOUNTED
RT
?
REPLACE RT.
1
SH 2
NO
YES
AC VOLTMETER
READS
GREATER THAN
0.7 V ac
?
2
SH 3
3
SH 5
START
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