Sharp AM-900 Service Manual page 84

AM-900U
This printer CPU executes the print action in accordance with the com-
mand from Main controller. Printer CPU controls each component of
Laser Beam Printer (LBP) as follows.
1) Main Motor control
2) Pickup Motor control
3) Fuser control
4) High Voltage Generator control
5) Laser Scanning control
6) Sensor monitor
7) Communication with Main controller
2.2.2 Signal connection
POWER SUPPLY
PWB UNIT
DRV
Heater
Lamp
drive
circuit
3.3 V Logic
RX_DATA
/SCLK
SCLK
TX_DATA /CMD
/CPRDY
GPO
/DSRDY
GPO
/DPAGE
GPO
D7~5
PB_DATA
PAGE_SYNC
PCURES
GPO
VIDEO IN
PIXEL_DATA
LINE_SYNC
5V Tolerance Buf.
WRLY GPO
LATCH
F.F.
DRV HLON GPO
/ZC
IRQ0
MICROCOMPUTER
5V Tolerance Buf.
/STS
TXD_3
SCK3_3
RXD_3G
GPI
GPI
GPI
3.3V->5V TRANS.
EPRDY
GPO
Buffer
/DCRDY
GPO
5V
/DREADY
Tolerance
GPO
5V Tolerance Buf.
/VSYNC GPO
Digital
/PCURES
Transistor
RES
GND
OSC1
20MHz
OSC2
APC_AUTO
TMOV
SYNC_LON
GPO
/LASERON
GPO
/SAMPON
GPO
PMD
GPO
VIDEO
SAMP
AN0
VFM
GPO
5 V Logic
/MEN
GPO
/MMRES
GPO
16bit
STEP
FTIOB
DIR
HD64F36049 GPO
/DOP
GPI
PI
GPI
PUMA
GPO
PUMB
GPO
/PUMAD
GPO
/PUMBD
GPO
GPI
GPI
GPI
GPI
Remove chattering
GPI
GPI*3
TC/BIASON
GPO
MCON
GPO
FTIOB0 PWM0
FTIOC0 PWM1
PWM2
FTIOD0
PWMINT
IRQ1/
LDEN
GPO
PMCLK
FTIOA1
IRQ2
TRGV
GPI
Fig. 6
5 – 11
Limit Temp.
5 V/24 V Control
COMP
RTH
FUSER
Thermister
DRV
FAN
MA+
MA-
Motor
STEPPER
MB+
Driver
MOTOR
MB-
+24V
COMP R-COVER
(F-COVER)
TRY OPEN
TORAY
PE BY
BYPASS
TORAY
DRV
DRV
STEPPER
MOTOR
DRV
for Paper
Pickup
DRV
/CAMSW
CAM SW
/ROLSNS PU ROLLER
SENSOR
/POUT1
P_OUT
from FUSER
/POUT2
P_OUT
from ROLLER
/PIN
P_IN
TCT2~TCT0
Toner C/T
DETECT SW
HIGH
VOLTAGE
PWB UNIT
PWMSIN
PWMSIN
Generation
Circuit
LDEN
Open
OPTICAL
Collector
UNIT
/PMCLK
Open
(LSU)
Collector
/HSYNC
/PMRDY
/PMD
Open
Collector
/VIDEO
Open
Collector
/S_H
Open
Collector