AL-1000, AL-1010 (serv.man14). AL1000 Electrical Section - Sharp Copying Equipment Service Manual (repair manual). Page 25

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Operation section  
(1) Outline 
The operation circuit is composed of the key matrix circuit and the display matrix circuit.
(2) Key matrix circuit 
The CPU in the MCU sends select signals SELIN1 - 3 to the selector in the operation circuit. The signals detects ON/OFF of
the key and are sent to the CPU as KIN1 - 2.
(3) Display circuit section  
The display is controlled by inputting the data signal and the clock signal from the CPU and the latch signal from the ASIC to
the LED driver in the operation circuit.
 
CPU
Selector
IC902,903
+5V
Key
Operation circuit
MCU
+5V
+5V
Operation circuit
MCU
CPU
ASIC
Display
LED
LED driver
IC901
OP-CLK
OP-DATA
OP-LATCH
AL-1000/1010
12-21
Page of 25
Display

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