Sharp SF-2052 Serviceanleitung Seite 214

<Display circuit>
This circuit is controlled with the data signal and the control signal
from the main control circuit.
(1) Block diagram
DATA
BE0
Operation
control
LATCH
circuit
CLK
32 bit driver block diagram
DATA
32 bit Shift Register
CLK
LATCH
BE0 Driver ON/OFF Control
GND
32 bit Latch
Driver
Q1 Q32
+5V
VCC
A Q30
Q31
OE
Q32
Q1
LE
CK
Q29
Q21
Q20
(2) Operational description
1
SQ32
Clock
Data signal
Latch signal
VD Strobe signal
Output LED
1
GND
2
3
4
31
32
Data signals (32 bit) sent from the operation control PWB are shifted
at the rising timing of the clock and retained at the resign timing of the
latch signal.
The retained data are outputted when OE signal becomes HIGH (5V),
lighting the LED.
12 – 11
+5V
SEG0
SEG1
SEG2
RPL
32
5V
5V
5V
LED light
up at LOW
level (0V)