Kenwood TM-321A Service Manual page 8

TM-32
CIRCUIT DESCRIPTION
@
Display circuit
according to
serial data sent from pins
P71
to P73 of the
Located
in
the
LCD
assembly
(Fig. 8), the display
microprocessor
to
the
LCD
driver.
Fig.
9 shows the
circuit
consists of the
LCD
driver,
its peripheral
circuits,
common output and segment output signals of the
LCD
and the
LCD.
The
LCD
is
driven
with
a
50%
duty cycle
driver.
wo
z n
B
|
2+
o
a
o
a
fe)
OG
G&
aw
a
4
+ +
2
213
+
Vico
GND
VicD
GND
Only the COM1
LeD
side
is
ON.
GND
COM1 and COM2
side
is
ON,
GND
Only the COM2
side
is
ON.
GND
COM1 and COM2
side are
OFF.
GND
1
fosc/s12
SEC
VLCD
Fig.
9
LCD
driver common and segment
output
signals
Fig. 8
LCD
ass'y
(B38-0303-05)
9
TM-32
CIRCUIT DESCRIPTION
@
Display circuit
according to
serial data sent from pins
P71
to P73 of the
Located
in
the
LCD
assembly
(Fig. 8), the display
microprocessor
to
the
LCD
driver.
Fig.
9 shows the
circuit
consists of the
LCD
driver,
its peripheral
circuits,
common output and segment output signals of the
LCD
and the
LCD.
The
LCD
is
driven
with
a
50%
duty cycle
driver.
wo
z n
B
|
2+
o
a
o
a
fe)
OG
G&
aw
a
4
+ +
2
213
+
Vico
GND
VicD
GND
Only the COM1
LeD
side
is
ON.
GND
COM1 and COM2
side
is
ON,
GND
Only the COM2
side
is
ON.
GND
COM1 and COM2
side are
OFF.
GND
1
fosc/s12
SEC
VLCD
Fig.
9
LCD
driver common and segment
output
signals
Fig. 8
LCD
ass'y
(B38-0303-05)
9