TB 9-4920-456-24
Table 6. Key Indicator Light Test Continued.
Key entry
switch positions
Test instrument
and
SELECT
INPUT/OUTPUT
keyboard
indicator
Multimeter
S2
indications1
S1
section
light
Light
(TRANSPONDER
C
3
M-3/A BIT
Lit
Low
CONTROL)
C
3
M-3/A BIT
Off
High
(TRANSPONDER
C
4
M-C BIT
Lit
Low
CONTROL)
C
4
M-C BIT
Off
High
(MODE 4)
C
5
BIT
Lit
Low
C
5
BIT
Off
High
(TRANSPONDER
C
6
M-1 ENBL
Lit
Low
CONTROL)
C
6
M-1 ENBL
Off
High
(TRANSPONDER
C
7
M-2 ENBL
Off
High
CONTROL)
C
7
M-2 ENBL
Lit
Low
(TRANSPONDER
C
8
M-3A ENBL
Off
High
CONTROL)
C
8
M-3A ENBL
Lit
Low
(TRANSPONDER
C
9
M-C ENBL
Off
High
CONTROL)
C
9
M-C ENBL
Lit
Low
(TRANSPONDER
C
10
M-T ENBL
Lit
Low
CONTROL)
C
10
M-T ENBL
Off
High
(TRANSPONDER
C
11
NORM
Lit
Low
STBY (NORM2)
CONTROL)
C
11
Off
High
(TRANSPONDER
C
12
EMER
Lit
Low
STBY (EMER2)
CONTROL)
C
12
Off
High
SPARE23
(TRANSPONDER
C
13
Lit
Low
CONTROL)
C
13
SPARE 2
Off
High
(TRANSPONDER
C
14
SPARE 3
Lit
Low
CONTROL)
C
14
SPARE 3
Off
High
(TRANSPONDER
C
15
STBY
Lit
Low
OFF (STBY2)
CONTROL)
C
15
Off
High
NORM
C
15
Lit
Low
OFF (NORM2)
C
15
Off
High
EMER
C
15
Lit
Low
OFF (EMER2)
C
15
Off
High
Low level is less than 0.4 V dc. High level is approximately 28 V dc.
1
Indicator light only.
2
(6) Press TI STBY key on TRANSPONDER CONTROL KEYBOARD.
EJECT test jack.
(8) Press EJECT key on TI TRANSPONDER CONTROL keyboard; EJECT key
indicator light will be on and multimeter will indicate between 22 and 28 V dc.
13