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Page Title:
Figure FO-8. Keyboard Lamp Illumination Circuits Functional Block Diagram |
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 TM 11-5865-215-13
LAMP
DRIVER
CCAA2
CODE
J
T
I
COLUMN
LATCH
U2B
(TYPICAL)
TAB LEA ROW SELECT CODE
FIRST INSTRUCTION SET EXECUTED)
1 OF 41/0
BUS CODE
RESULTING ROW SELECT CODE
(DURING
(LATCHED INTO ROW SELECT
I
WR1l TIME)
LATCH U2A)
I
COLUMN LATCH U3A
--.
1 OF 4 CODE
1
4 CODE
AND ASSOC CIRCUITS
I/0
I/0
I/0
(SEE TABLE B)
3
2
1
0
I
1 SELECTS
1
0
I
KEY
LAMPS
0'0
2 SELECTS
2
(SEE TABLE B)
1
1
1
O
O
SE
0'0
4 SELECTS
COLUMN LATCH U4A
lo
DE/4
AND ASSOC CIRCUITS
/
(SEE TABLE B)
I
T
COLUMN LATCH U4B
4
CODE
/4
1
AND ASSOC CIRCUITS
4
2
/
TABLE B. COLUMN SELECT (WRIO, SECOND INSTRUCTION SET EXECUTED)
0
1-
(SEE TABLE B)
q
l-OF-4 ROW SELECT C O D E
BUS
4-BIT
FROM
BINARY
BUS
c
(ENTERED
DURING
TIME; SEE TABLE A ABOVE)
CODE (DURING
o
PROCESSOR
_.
WRIO TIME)
CODE 1 (ROW 1)
CODE 3 (ROW 3)
CODE 4 (ROW 4)
L
CODE 2 (ROW 2)
Iv
u
SELECTED
CCA Al
I
LAMP
LAMP
LAMP
LAMP
COLUMN
LAMP
LAMP
LAMP
M
7
DRIVER
LATCH
DRIVER
DRIVER
DRIVER
(KEY
(KEY
3
2
1
0
N
LOAD
Al
ROW STROBE
,
COLUMN LATCH U5B
4
1 OF
CODE
AND
CIRCUITS
I
1
MGC (S3)
Q4
o
0
0
SQL (S1)
Q2
AGC (S2)
Q3
LMGC
U2B
,
/
I
I
(SEE TABLE B)
TEST
8
BW
30 kHz BW
50 kHz BW
o
0
TONE (S5)
Q5
Q6
U3A
(S6)
Q7
(s7)
(S8)
2
COLUMN LATCH U6A
4
OF 4
CODE
FM (S11)
NOT USED
0
1
3
AM (S10)
Cw (s12)
U3B
0
AND ASSOC CIRCUITS
(SEE TABLE B)
Q13
BINARY
0
1
0
0
NOT USED
USB (S15)
(216
LSB (S16)
U4A
NOT USED
4
TO
I
II
0
1
0
1
5
U4B
Q17
7 (s17)
4 (S18)
1 (s19)
Q20
o (s20)
I
I
1
CODE
Csll
COLUMN LATCH
Bus
DECODER
FROM
AND ASSOC CIRCUITS
Q22
1
Q24
-
0
1
0
Q23
2 (S23)
U5A
6
8 (S21)
5 (s22)
(S24)
/
CONTROL
(SEE TABLE B)
J
L
CCA A7 1
LOAD
1
1
Q28
0
Q25
7
Q27
3 (S27)
U5B
9 (s25)
6 (S26)
CLR (S28)
I
I
II
CCA
I
4
Q29
Q30
RCL (S30)
(S31)
Q32
F2 (S32)
U6A
STO (S29)
COLUMN LATCH U7A
1
4 CODE
AND ASSOC CIRCUITS
I
FROM
MECHANICAL
AUTO STEP
AUTO SWEEP
START
HOLD
(SEE TABLE B)
I
I
0
0
OF
Q33
Q34
1
9
U6B
Q35
Q36
(s33)
(s34)
(s35)
(S36)
PROCESSOR
LATCH
CCA Al
SELECT FUNCTION
MAN TUNE
FINE
MEDIUM
COARSE
F)
Q38
Q37
Q39
Q40
U7A
(S38)
(s39)
(s37)
S40 )
FROM
I
I
I
I
I
DATA A
DATA B
TUNE
RCVR
4
CONTROL
Q41
Q42
U7B
Q44
NOT
USED
Q43
(s41
(s41 )
(s43)
A7
L
.
.
--
--
--
--
--
--
--
--
--
--
Illumination Circuits Functional
Block Diagram
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