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TM 11-5820-890-20-2
4-22
4.2.
TROUBLESHOOTING FLOWCHARTS. Continued
B
CHART 7
NO AUDIO HEARD AT HANDSET AND/OR LOUDSPEAKER
WHEN RCU IS PLACED IN •SQ OFF".
(Sheet 2 of 3)
NO
YES
NOISE HEARD
IN LS 685
LOUDSPEAKER
?
1. CONNECT LS 685 LOUDSPEAKER TO RCU
SPEAKER CONNECTOR.
2. REPLACE RT.
3. SET THE RT AS FOLLOWS:
FCTN: REM
REPLACED RT IS BAD.
REPLACE RCU.
NO
YES
AC VOLTMETER
READS
GREATER THAN
7 V ac
?
1. REMOVE LS 685 LOUDSPEAKER FROM RCU
SPEAKER CONNECTOR.
2. SET THE RCU VOLUME SWITCH FULL CW.
3. SET UP DIGITAL VOLTMETER AS AN AC
VOLTMETER AT THE 20 V ac RANGE.
4. MEASURE AC VOLTAGE AT RCU SPEAKER
CONNECTOR PIN E TO PIN A. GROUND
LEAD CAN BE PLACED AT EITHER PIN.
REPLACE LS 685
LOUDSPEAKER.
1
SH 2
RCU SPEAKER
CONNECTOR
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