Sharp SF-1014 Service Manual page 115

(2) Display circuit
Control is performed with the data signal and the control signal from
the control circuit.
1
Block diagram
Main
control
circuit
DATA
32 bit Shift Register
CLK
LATCH
ENABLE Driver ON/OFF Control
GND
01
DATA
CLK
LATCH
ENABLE
Sout
32 bit Latch
VD
Driver
GND
032
VD (+10V)
LED
VD (+5V)
OUT
S IN
S OUT
BEO
VD CLK LATCH STROBE
VD (+5V)
VD (+5V) VD (+10V)
DC power
circuit
2
Operation
1
Clock
Data signal
Latch signal
Strobe signal
Output LED
1
2
3
4
51
52
DAta signal (8 bit) sent from the main control PWB is shifted at the
rising timing of the clock and retained at the rising timing of the latch
signal.
The retained data is outputted when STROBE signal becomes HIGH
(5V).
12 – 12
8
5V
5V
5V
LED light
up at LOW
level (0V)