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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_183
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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_185


TM  11-5820-890-20-2 2-117 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 32 NO RT-B MODULATION AT COMMANDER'S C 2298. MONITOR SWITCH AT C. (Sheet 5 of 5) Set up multimeter as an ac voltmeter. Use the lowest range. Connect meter probes between signal line or a test point and chassis ground. Key the handset and whistle into the mic. Look at the meter and note any change in the ac voltage. The change indicates the presence of the talk signal. The reading will be less than 1 volt. V U T S R P N M L K J H F E D C B A C 2298 J801, J804 NO YES SIDETONE HEARD ? 1 SH 2 1.   SET AM 1780 RAD TRANS TO CMDR AND CREW. 2.   AT CREWMEMBER C 2298, PRESS PTT AND COUNT INTO HS WITH MONITOR AT C. 1.   REMOVE CX 4723 FROM COMMANDER'S C 2298 J801/J804. 2.   CHECK CONTINUITY AT J801, PIN V TO J804, PIN V. NO YES OPEN ? REPLACE COMMANDER'S C 2298. NO YES AC VOLT CHANGE ? REPLACE COMMANDER'S C 2298. 1.   OBSERVE CHANGE IN AC VOLTAGE AT COMMANDER'S C 2298 J801/J804, PIN V TO PIN A (GND) (SEE NOTE). 2.   PRESS PTT AND WHISTLE SHARPLY INTO HS. REPLACE CX 4723. 4 SH 5


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