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2.2.3 Signal assignment to the Printer CPU pins
Mechanism control CPU
Control unit
Signal
OA-2000 I/F
/STS
/SCLK
/CMD
/PCURES
/DCRDY
/DREADY
/EPRDY
/VSYNC
/CPRDY
/DPAGE
/DSRDY
LSU
APC_AUTO
/SYNC
PMCLK
LDEN
PMD
/LASERON
SAMPON
SYN_LON
High voltage
PWM0
PWM1
PWM2
/PWMINT
MCON
TC/BSON
Sensor
/PIN
/POUT1
/POUT2
PE_BY
OPEN_TRAY
/DOP
/CAMSW
/ROLSNS
TCT2
TCT1
TCT0
Fusing
RTH
HLON
Main motor
/MEN
/MMRES
STEP
Pickup motor
PUMA
PUMB
/PUMA
/PUMB
Fan
VFM
Power supply
/ZC
PWRLY
Pin No.
TXD
Video I/F signals to/from the main CPU (OA-2000)
SCK
RXD
RESET
GPO
GPO
GPO
GPO
GPI
GPI
GPI
TMOV
APC timing generation signal for line cycle
TRGV
Laser main scanning sync signal
IRQ
FTIOA1
Polygon motor clock
GPO
Laser circuit driving signal
GPO
Polygon motor driving signal
GPO
Laser on
GPO
APC circuit sample signal
GPO
Next line laser on (SYNC)
FTIOB0
Clock for high voltage control clock PWMSIN
FTIOC0
Clock for high voltage control clock PWMSIN
FTIOD0
Clock for high voltage control clock PWMSIN
IRQ
Timer setting change interrupt
GPO
Charge control
GPO
Transfer/DC bias control
GPI
Main unit paper feed detection (Paper-In)
GPI
Paper eject detection (Paper-Out/fusing section)
GPI
Paper eject detection (Paper-Out/exit roller section)
GPI
Detection of paper presence in the bypass tray
GPI
Tray cover open/close detection
GPI
Door open/close detection (front and right doors)
GPI
Cam home position detection
GPI
PU roller rotational position detection
GPI
Toner cartridge identification
(Destination and initial toner charge)
GPI
GPI
AN
Thermistor analog input (temperature detection)
GPO
Heater lamp ON/OFF control
GPO
Excitation enable
GPO
Reset input (Home State)
FTIOA
Step clock
GPO
Excitation phase A
GPO
Excitation phase B
GPO
Excitation phase /A
GPO
Excitation phase /B
GPO
Fan ON/OFF control
IRQ
AC zero-cross signal input
GPO
Power relay ON/OFF signal
5 – 12
Description
AM-900U
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Troubleshooting
