Sharp AM-900 Service Manual page 81

2.1.4 Scanner I/F block
1) CIS I/F block
The CIS is controlled through buffer (IC14) by Main CPU (IC1), and
the output video signal from CIS is input into AFE block of Main CPU
(IC1). CIS LED is controlled through LED driving circuit (IC36,
Q29~Q34) by Main CPU (IC1).
CIS
Image sensor
2) Scanner Motor control
MTD2007F (IC12): pin-28 HSOP (Scanner Motor Driver)
The scanner motor is driven by this Motor Driver which is the constant
current motor driver with bipolar, chopper system the rotation speed
and its timing of the scanner motor are controlled by Main CPU (IC1).
Scanner
Motor
2.1.5 Panel I/F block
The strobe signals for LCD control and key scanning of the operation
panel PWB unit are output from the GPIO port of the Main CPU (IC1).
The key switch sense signals from panel unit is connected to periph-
eral bus via buffer IC (IC14).
LCD
LED R/G/B
Motor Driver Motor Driver
(IC12)
(IC12)IC12
Operation
Panel
PWB
Control
unit
Signal
Key Sense
Signal
LED Driving
circuit
Buffer IC
(IC14)
Video signal
Fig. 2
)
Fig. 3
Strobe Signal
Control Signal
Buffer IC
(IC14)
Peripheral
Bus
Fig. 4
5 – 8
AM-900U
Main CPU
(IC1)
AFE
BLOCK
Main CPU
(IC1)
Main CPU
(IC1)