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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_224
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TROUBLESHOOTING FLOWCHARTS. Continued - TM-11-5820-890-20-2_226


TM  11-5820-890-20-2 2-158 2.2. TROUBLESHOOTING FLOWCHARTS. Continued Chart 43 NO RT MODULATION AT SRM FROM COMMANDER'S C 2298. (Sheet 7 of 12) 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 ac voltage. The change indicates the presence of the talk signal. The reading will be less than 1 volt ac. PSA J1 K L F E R M H C B A D J N P Z Y d b a S R X W V T U Q P N M L K J F E D C B A G H PSA J2 NO YES OPEN ? 1.   SET AM 1780 MAIN PWR TO OFF. 2.   REMOVE PSA FROM MB. 3.   CHECK CONTINUITY AT PSA, J1, PIN N TO J2, PIN E. REPLACE PSA. REPLACE RT. 1.   OBSERVE CHANGE IN AC VOLTAGE AT PSA J1, PIN N TO PIN A (GND) (SEE NOTE). 2.   PRESS PTT AND WHISTLE SHARPLY INTO HS. NO YES AC VOLTAGE CHANGE ? 9 SH 8 7 SH 7


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