Yaesu FT-208R Maintenance Service Manual page 45

SERVICING
POWER ON RESET PULSE CIRCUIT
1 3 �l-"12=--- - 0 3 01 PI N 21
a
� r -
u
q
0
FRAME CLOCK OSCILLATOR C IRCU IT
Q303
Q302 LCD DRIVER TP040 1
PIN No.
PORT
l D l
2 STD
3 CE
4 FC
5 Vss
6, 7 , 8
COM l , 2, 3
1 0 - 1 4 SEG
1 5 -24
SEG
voo
25
26
D4
27 D 3
28 D 2
� Q303
DATA INPUT l Normally "H"
STROBE Normally "L"
CHIP ENABLE Normally "H"
FLAME CLOCK
LCD DRIVING VOLTAGE
COMMON OUTPUT
SEGMENT OUT
SEGMENT OUT
+SY
DATA INPUT 4 Normally "H"
DATA INPUT 3 Normally "H"
DATA INPUT 2
Normally "H"
JL
I O mS
H LT PULSE GENERATOR
g �
�
_Jr-
JL
DELAY T I ME 6mS
FUNCTIONS/WAVE FORMS
1 . 8V
3- 1 4
Q 303
s v
HLT S IGNAL
0. 6 mS
k
sv
l.SV