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TM 11-5820-890-20-2
2-6
2.1.
OPERATIONAL CHECK. Continued
STEP 6. VAA RADIO AND INTERCOM INTERFACE TEST:
STEPS TO PERFORM
CHECKS TO MAKE
ACTIONS TO TAKE
6.1
Set AM 1780 MAIN PWR to NORM.
Set RT A LS 671 CB1 to ON.
Connect HS to VAA J3 (RT-A) or VAA J2
(RT-B)*
N/A
N/A
Ensure that HS is operational
N/A
N/A
Go to Step 6.2
6.2
Perform Operational Check on radio(s)
(Refer to TM 11-5820-890-20-1)
Ensure radio(s) pass
Operational Check?
Go to Step 6.3
6.3
Connect HS to VAA J3/J2
Set RT FCTN to SQ ON
Press Push To Test *
N/A
N/A
Test tone heard in HS
N/A
N/A
Go to Step 6.4
6.4
Set all RT(s):
FCTN to SQ ON
MODE to SC
Connect HS to C 2298 J802 and to C 2297 J902
N/A
N/A
N/A
N/A
N/A
Go to Step 6.5
6.5
Set a crewmember C 2298 MONITOR to A
Press HS PTT
N/A
RT A keys?
N/A
NO:
Go to Step 6.6
YES: Replace AM 1780
6.6
Set a crewmember C 2298 MONITOR to C
Press HS PTT
N/A
RT B keys?
N/A
NO:
Go to Step 6.7
YES: Replace AM 1780
6.7
Set commander's C 2298 MONITOR to A
Press HS PTT
N/A
RT A keys?
N/A
NO:
Go to Step 6.8
YES: Replace AM 1780
6.8
Set commander's C 2298 MONITOR to C
Press HS PTT
N/A
RT B keys?
N/A
NO:
Go to Step 6.9
YES: Replace AM 1780
6.9
Set AM 1780 RAD TRANS to CDR ONLY
Either RT keys?
NO:
Go to Step 6.10
YES: Go to TS Chart 24
6.10 Set commander's C 2298 MONITOR to ALL
Set RT-A FCTN to SQ OFF
Set RT-A VOL to Full CW
N/A
N/A
N/A
N/A
N/A
Go to Step 6.11
6.11 Listen at commander's HS
Rushing noise heard?
YES: Go to Step 6.12
NO:
Go to TS Chart 25
6.12 Press HS PTT
RT-A keys?
YES: Go to Step 6.13
NO:
Go to TS Chart 26
6.13 Press HS PTT, count into HS
Sidetone heard?
YES: Go to Step 6.14
NO:
Go to TS Chart 27
6.14 Set commander's C 2298 MONITOR to A
Listen at commander's HS
N/A
Rushing noise heard?
N/A
YES: Go to Step 6.15
NO:
Go to TS Chart 28
6.15 Press HS PTT, count into HS
RT-A keys and sidetone
heard?
YES: Go to Step 6.16
NO:
Replace commander's
C 2298
* If VAA is an A ,C or D model disconnect W-4 cable from VAA and RT. Connect H -250 to RT AUD/DATA.
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