Sharp AL-1020

2. Circuit descriptions
A. Main PWB (MCU)
(1) CPU signal table
The additional signal is as follows:
Pin No. Signal name In/Out During operation
109 SIN3 Input Sensor input 3
The signals of function change are as follows:
Pin No. Signal name In/Out During operation
119 MRMT3 Motor output Mirror motor/SPF motor control signal
120 MRMT2 Motor output Mirror motor/SPF motor control signal
121 MRMT1 Motor output Mirror motor/SPF motor control signal
122 MRMT0 Motor output Mirror motor/SPF motor control signal
(2) ASIC signal table
The additional signal is as follows:
Pin No. Signal name In/Out Connection Descriptions
201 SGS Output TR array IC
SPF gate solenoid
control signal. “H”: Gate
solenoid ON
202 SRRC Output TR array IC
SPF resist roller clutch
control signal. “H”:
Clutch ON
203 SPUS Output TR array IC
SPF pickup solenoid
control signal. “H”:
Solenoid ON
208 SPFS Output TR array IC
SPF paper feed solenoid
control signal. “H”:
Solenoid ON
209 SMSEL Output TR array IC
SPF/mirror motor relay
switch signal. “L”: Mirror
motor, “H”: SPF motor
227 CPFS2 Output TR array IC
2nd cassette paper feed
solenoid control signal.
“H”: Solenoid ON
(3) Input signal table
The additional signals are as follows:
Signal name Descriptions
SPF
SPID SPF paper entry detection signal
SPPD SPF paper transport detection signal
SDOD SPF open/close detection signal
SDSW SPF cover open/close detection signal
2nd
CED2 2nd cassette section cassette presence detection
PPD3 2nd cassette section paper transport detection
AL-1250
9-3