Kenwood TM-631A Service Manual page 13

TM-631A
CIRCUIT DESCRIPTION
Pin
Name
170
Logic
Function Name
vo
Logic
Function
No
Noa
P41 33 PTH01
144
MHz S/RF meter analog input
P40
34
PTHOO
430
MHz S/RF
meter analog input
P53
35
T11
DA
converter digital output Not
connected
P52
36 T10
P51 37 P23
Output during single operation
P50 38 P22 Not connected
RESET
Reset
input
39
P21 Not connected
x2
40
P20 Beep tone generator
4.194304
MHz crystal oscillator
x1
41 P03/S1
Ui
Microphone DOWN switch
input/serial data input
10 P63
42
P02/SO
vo
Li-
PLL
IC
(14
MHz) enable output
Microphone
PTT switch
input/serial data output
11
P62 PLL
IC
(430 MHz) enable output
43 P01/SCK
Li-
h
UP switch
input/serial
clock
input/ output
12 P61 PLL IC data output
44
INT4
I
H
Backup detector
input
Remote control unit connection-detect input
13 P60 PLL
IC
clock
output
45
P123
J
H
(Onty when connected)
14
P73
CTCSS
enable output
46 P122
I
L Main band
BUSY
input
15 P72 Shift
register enable output
47 P121
CTCSS
tone count input
16 P71
Shift
register and
CTCSS
(Continuous Tone Coded
48 P120
Squeich
System) lock
output
Subband
BUSY
input
17 P70 Shift
register and
CTCSS
data output
49 P133
18 P83 Not connected 50 P132
Key input
19 P82
$1
P131
20
P81
LOCK switch
input
52 P130
d
21 P80
Not
connected 53 P143
22
Ps3
54 P142
Key output
23 P92
input
55 P141
24 P91 56 P140
25 P90 Not connected 57 NC
26
Vss
Ground (0 V) 58
Vop
Power
pin
(5
V)
27 INT3 Sub encoder data input 59 P33 LCD driver data output
28 INT2 60 P32 Main encoder data input LCD
driver
clock output
29 INT1 Sub encoder clock
input
61 P31 Sub LCD
driver enable output
30
INTO
Main encoder clock
input
62 P30 Main LCD
driver enable output
31
PTH03
MIC DOWN switch
input
63 P43
D-A
converter digital output
32 PTH02 MIC UP switch
input
64
P42
1
0
2
0
3
4
5
6
7
L/
9
O
L
o
H
Table
6
»PD75112GF-530-3BE
Pin
Functions (Control Unit
IC)
®
Key
and Rotary Encoder
Input
Circuit
Fig. 16 shows the key and rotary encoder input circuit. The
keys
on the front panel form
a
matrix
which
the
microproces-
sor reads by
scanning. Signals
from the two
rotary
encoders
(MAIN and
SUB),
the microswitches
(PTT,
UP,
DOWN)
and
the
F.LOCK switch
are applied to the
CPU directly.
FLOCK
z
5c
Fede
PO!
p03
43
K
x3
ICIOI
P02
42
PTH02
32
™ ™
PTT
UP
DWN
CALL VFO
MR
PF
Fig. 16-1 Microphone key
input circuit
Fig. 16 Key, Switch,
and
Rotary
Encoder
Input
Circuit
12
TM-631A
CIRCUIT DESCRIPTION
Pin
Name
170
Logic
Function Name
vo
Logic
Function
No
Noa
P41 33 PTH01
144
MHz S/RF meter analog input
P40
34
PTHOO
430
MHz S/RF
meter analog input
P53
35
T11
DA
converter digital output Not
connected
P52
36 T10
P51 37 P23
Output during single operation
P50 38 P22 Not connected
RESET
Reset
input
39
P21 Not connected
x2
40
P20 Beep tone generator
4.194304
MHz crystal oscillator
x1
41 P03/S1
Ui
Microphone DOWN switch
input/serial data input
10 P63
42
P02/SO
vo
Li-
PLL
IC
(14
MHz) enable output
Microphone
PTT switch
input/serial data output
11
P62 PLL
IC
(430 MHz) enable output
43 P01/SCK
Li-
h
UP switch
input/serial
clock
input/ output
12 P61 PLL IC data output
44
INT4
I
H
Backup detector
input
Remote control unit connection-detect input
13 P60 PLL
IC
clock
output
45
P123
J
H
(Onty when connected)
14
P73
CTCSS
enable output
46 P122
I
L Main band
BUSY
input
15 P72 Shift
register enable output
47 P121
CTCSS
tone count input
16 P71
Shift
register and
CTCSS
(Continuous Tone Coded
48 P120
Squeich
System) lock
output
Subband
BUSY
input
17 P70 Shift
register and
CTCSS
data output
49 P133
18 P83 Not connected 50 P132
Key input
19 P82
$1
P131
20
P81
LOCK switch
input
52 P130
d
21 P80
Not
connected 53 P143
22
Ps3
54 P142
Key output
23 P92
input
55 P141
24 P91 56 P140
25 P90 Not connected 57 NC
26
Vss
Ground (0 V) 58
Vop
Power
pin
(5
V)
27 INT3 Sub encoder data input 59 P33 LCD driver data output
28 INT2 60 P32 Main encoder data input LCD
driver
clock output
29 INT1 Sub encoder clock
input
61 P31 Sub LCD
driver enable output
30
INTO
Main encoder clock
input
62 P30 Main LCD
driver enable output
31
PTH03
MIC DOWN switch
input
63 P43
D-A
converter digital output
32 PTH02 MIC UP switch
input
64
P42
1
0
2
0
3
4
5
6
7
L/
9
O
L
o
H
Table
6
»PD75112GF-530-3BE
Pin
Functions (Control Unit
IC)
®
Key
and Rotary Encoder
Input
Circuit
Fig. 16 shows the key and rotary encoder input circuit. The
keys
on the front panel form
a
matrix
which
the
microproces-
sor reads by
scanning. Signals
from the two
rotary
encoders
(MAIN and
SUB),
the microswitches
(PTT,
UP,
DOWN)
and
the
F.LOCK switch
are applied to the
CPU directly.
FLOCK
z
5c
Fede
PO!
p03
43
K
x3
ICIOI
P02
42
PTH02
32
™ ™
PTT
UP
DWN
CALL VFO
MR
PF
Fig. 16-1 Microphone key
input circuit
Fig. 16 Key, Switch,
and
Rotary
Encoder
Input
Circuit
12