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TM 11-5820-890-20-2
2-9
2.1.
OPERATIONAL CHECK. Continued
STEP 7. SRM RADIO AND INTERCOM INTERFACE TEST: Continued
STEPS TO PERFORM
CHECKS TO MAKE
ACTIONS TO TAKE
7.10 Set each crewmember C 2298 MONITOR to ALL
Listen at each crewmember HS
N/A
Rushing noise heard?
N/A
YES: Go to Step 7.11
NO:
Go to TS Chart 37
7.11 Press HS PTT at each crewmember C 2298
RT keys?
YES: Go to Step 7.12
NO:
Go to TS Chart 35
7.12 Press HS PTT, count into HS of each
crewmember C 2298
Sidetone heard?
YES: Go to Step 7.13
NO:
Go to TS Chart 36
7.13 Set each crewmember C 2298 MONITOR to A
Press HS PTT at each crewmember C 2298
N/A
RT keys?
N/A
YES: Go to Step 7.14
NO:
Replace defective
C 2298
7.14 Set AM 1780 INT ACCENT to ON
Set any control box MONITOR to INT ONLY
Press HS PTT
Listen at a different control box
N/A
N/A
N/A
Rushing sound reduced?
N/A
N/A
N/A
YES: END OF TEST
NO:
Replace AM 1780
2.2.
TROUBLESHOOTING FLOWCHARTS.
This paragraph provides the unit maintainer with three general use schematics (SINCGARS Using a VAA and
AM 1780 Interface, SINCGARS Using a PSA and AM 1780 Interface, and AM 1780 and Control Box Interface)
plus 43 Troubleshooting Charts. The unit maintainer is directed to one or more specific Troubleshooting Charts
from the Operational Check. Use of Troubleshooting Charts prior to application of the Operational Check,
represents poor use of unit maintainer time, can result in false pulls, and is strongly discouraged.
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