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TM 11-5820-890-20-2
4-8
4.2.
TROUBLESHOOTING FLOWCHARTS. Continued
CHART 1
RCU DISPLAY READS •OPEN" DURING SELF TEST.
(Sheet 4 of 8)
1. REPLACE RCU BATTERY BOX.
2. CONNECT AC VOLTMETER TO RCU BATTERY
BOX E1 AND E2 TERMINALS. GROUND LEAD
CAN BE PLACED AT
EITHER TERMINAL.
3. RESET RCU AS FOLLOWS:
COMSEC: CT
FCTN: TST
4. OBSERVE AC VOLTMETER WHEN RCU
DISPLAY READS OPEN.
NO
YES
AC VOLTMETER
READS
GREATER THAN
0.7 V ac
?
REPLACE RCU.
REPLACED BATTERY BOX
IS BAD.
4
SH 4
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