|
| |
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
|
