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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_165
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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_167


TM  11-5820-890-20-2 2-99 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 28 NO RT-A MONITORING AT COMMANDER'S C 2298. MONITOR SWITCH AT A. (Sheet 1 of 6) The RT in the SQ OFF position is used to provide an ac signal in the system. The variable audio line will produce 3.0 to 8.0 V ac when the volume control is set full cw. Set up multimeter as an ac voltmeter. Use the 20 V range. Connect meter probes between test points and chassis ground. NOTE: Remove each cable one at a time and check for rushing noise. The rushing noise will return once the short has been removed. V U T S R P N M L K J H F E D C B A AM 1780 J504 NO YES 3.0 TO 8.0 V ac ? 1.   REMOVE COMMANDER'S CX 4723 FROM AM 1780 J504. 2.   MEASURE AC VOLTAGE AT AM 1780 J504 FROM PIN M TO PIN A (GND). NO YES RUSHING NOISE ? 1.   REMOVE A CX 4723/7060 FROM THE AM 1780 J505, J506, OR J507. 2.   LISTEN AT COMMANDER'S C 2298. 1 SH 2 2 SH 4 3 SH 3 NO YES ALL CX 4723/7060 REMOVED ? START


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