Kenwood TK-768 Service Manual page 34

Á
Tt+768/H
SEMICONDUGTOR
DATA
Pin No. Port Name
tlo
Function
1 9
TXD
o
RS-232C data output.
2 0 RXD
RS-232C data input.
21
4 . 1 9
o
DTMF decoder svstem clocr.
22 STD
DTMF decoder STD. '1" : DTMF signal absent, "H" : DTMF signai present
t ó
UP/SMRO Smartrunk ACK/REO.
24 DN
S D
DTMF decoder data.
26 EDT
vo
EEPROM serial data.
2 7 ECK
EEPROM serial clock.
2 8
I V
TEST
LCD check mode. "1" : On, "H" : Off
30, 31
32
S M D I
Smartrunk serial data.
33
RST
Reset.
a Á
xcl
Sub clock.
35
xco
S u b c l o c k .
36 XI
Clock
3 7 XO
Clock.
3B
VSS
G N D .
APTT
External PTT. "L" : On, "H" : OÍf
40
A H K E x t e r n a l h o o k . " 1 " : O n h o o k . " H " : O f f h o o k
4 1 V L U P
VOL up. "1" : On, "H" : Off
42
VLDN
VOL down. "1" : On, "H" : OÍÍ
43
SCN
SCN. '1" : On. 'H" : OfÍ
44
AUX A . " 1 " : O n , " H " : O f f
45 M O N M O N . " 1 " : O n , " H " : O f Í
46 D/A
D / 4 . ' 1 " : O n , " H " : O f Í
À a
S E L F
Dealer/Test mode enter. "1" : OK, "H" : NG
48 KM2O
DTMF microphone PTT. "1" : OfÍ, "H" : On
49
U
Smartrunk power supply. "L" : OÍf, "H" : On
50
5 1
M M
o
Microphone mute. "L' : Unmute, "H" : Mute
52
Audio control. "L" : Mute, "H" : Unmute
53
ó l
I
Scrambler binarv data 1
B 2
I Scrambler binary data 2.
SCR
o
Scrambler. "L' : Off, "H" : On
cb
S M R D
Smartrunk data ready.
57
coR
58
t-N
Common clock.
59
KEY TX key. "1" : TX off, "H" : TX on
60
DT
Common data.
O I
E S
Shift register strobe. "1" : Load, "H" : Latch
62
H N C
Horn control. "L" : OÍÍ, "H" : On
63
E P
PLL chip select. "1" : Select, "H" : Not select
64 EN
D/A converter chip select. "L" : Select, "H" : Not select
65-88
è z J - 5 U
LCD segment 23-0.
89 VDD
+5V.
90
VREF
+5V.
9 1 , 9 2
v ó - Y c
c o M 2 - C O M 0
LCD common 2-0.
96, 97 VL3, VL2
qQ oo
1 0 0
| vL1
[
f
46