Semiconductor Data - Kenwood TK-260G Service Manual

CIRCUIT DESCRIPTION/SEMICONDUCTOR DATA
8. CONTROL SYSTEM
Keys and channel selector circuit.
The signal from the keys and channel selector are directly
input to the microprocessor, as shown in fig. 10.
Channel selector
IC13
25
EN1
-COM
16
EN2
27 EN3
TK-260G
CN1
CN501
TK-270G
Fig. 10 Control system

SEMICONDUCTOR DATA

LCD Driver : LC75823W (Display UNIT IC501)
(TK-270G only)
Block diagram
COM1 COM2 COM3
V 1
COMMON
DD
DRIVER
V 2
DD
INH
CLOCK
OSC
GENERATOR
Pin function
Pin No. Name I/O Active
Segment output for displaying data
1-52 S1-S52 O -
transferred form serial data.
Common drive output.
53-55 COM1-COM3 O -
Frame frequency fo=(fosc/384)Hz
56 VDD - -
The display to turn off
57 INH I L INT=L : Turn off
INT=H : Turn on
Apply 2/3 the LCD drive bias voltage
58 VDD1 I - from outside. If 1/2 the bias is applied,
connect to VDD2.
Apply 1/3 the LCD drive bias voltage
59 VDD2 I - from outside. If 1/2 the bias is applied,
connect to VDD1.
5M
3
PTT
PTT
47k
SW
87
KEYAD
LAMP
47k
SW
MONI
100k
SW
1 2 3 A
4 5 6 B
8
7 9 C
0 # D
S52 S51 S1
LATCH & DRIVER
SHIFT REGISTER
ADDRESS
DETECTOR
DI CL CE V V
DD SS
Function
TK-260G/270G
Pin No. Name I/O Active
60 VSS - -
61 OSC I/O - Oscillation terminal
Chip enable. Serial data transfer terminal.
62 CE I H
Connected to the microprocessor.
Synchronizing clock. Serial data transfer terminal.
63 CL I
Connected to the microprocessor.
Trnsfer data. Serial data transfer terminal.
64 DI I -
Connected to the microprocessor.
UPB1509GV (IC301)
Pin connection diagram
1 5
2 6
3 7
4 8
Block diagram
D Q D
IN
CLK CLK
IN
Q
Pin Fanction
Pin Pin Applied Pin
No. name voltage voltage
1 V 2.2-2.5 - Power supply voltage pin for the input amplifier section and
CC1
division circuit. Connect a bypass capacitor to this pin to reduce
the high-frequency impedance with the ground (for example, 1000 pF).
2 IN - 1.7-4.95 Signal input pin. Connect a coupling capacitor to this pin for
DC cutting with an external circuit (for example, 1000 pF).
3 IN - 1.7-4.95 Input signal bypass pin. Connect a bypass capacitor to this
pin to reduce the high-frequency impedance with the ground
(for example, 1000 pF).
4 GND 0 - Ground pin. Connect it with the ground pattern. The ground
pattern on the PC board should be wide enough to minimize
impedance.
5 SW1 H/L - Division ratio setting pin. The division ratio can be set by the
following voltage:
6 SW2 Connect a bypass capacitor to this pin to reduce the high-
frequency impedance with the ground.
7 OUT - 1.0-4.7 Division signal output pin. Emitter follower output. 0.1 Vpf or
more can be output under 200-ohmload. Connect a coupling
capacitor to this pin for DC cutting with an external circuit
(for example,1000 pF).
8 V 2.2-5.5 - Power supply voltage pin for the output buffer circuit. Connect
CC2
a bypass capacitor to this pin to reduce the high-frequency
impedance with the ground (for example, 1000 pF).
Function
Pin No. Pin Name
1 V
CC1
2 IN
3 IN
4 GND
5 SW1
6 SW2
7 OUT
8 V
CC2
Q D Q
CLK OUT
Q Q
SW1 SW2
Functions and uses
SW2
H L
H 1/2 1/4
SW1
L 1/4 1/2
21