Oki C9500dxn, Maintenance Manual, Page: 19 / 220

41956001TH Rev.1
19 /
Oki Data CONFIDENTIAL
Figure 2.3
The engine control block (PU) is controlled by the engine control board (K7N PWB) which consists
of a CPU (MSM66Q577), general LSI chip (DCON, MCON), flash ROM, EEPROM, SRAM,
SDRAM and pulse motor drivers (see Figure 2.3).
(1) CPU
This, a 16-bit CPU with an AD converter (OKI MSM66Q577), controls the entire system.
(2) DCON LSI
This LSI (UPD65454GD-241-LML, UPD65946GD-137-LML), which is contained in the
printer engine control block, incorporates 16 megabits of video memory and has functions
such as engine-controller interfacing, LED interfacing, video memory control, main scan color
misalignment correction and skew correction.
2.2 Engine Control Board (K7N PWB)
OPTION TRAY
INT
28MHz
CPU
MSM66Q577
FLASH
MCON
LSI
SRAM
EEPROM
CONTROL
PANEL
MOTOR
DRIVER
PULSE
MOTOR *9
GEARED
MOTOR
CLUTCH
LED HEAD (K)
LED HEAD (Y)
LED HEAD (M)
LED HEAD (C)
PU FAN
FUSER FAN
ID, BELT,
FUSER
CHECKS
CLOCK
GENERATOR
DCON
LSI
MOTOR
DRIVER
CLK
RESET
DUPLEX
PAPER SIZE
STACKER FULL
CU
SDRAM
SDRAM
PAPER THICKNESS
SENSOR
COROR REGISTRATION
SENSOR
COVER OPEN
(UPPER, STACKER, RIGHT SIDE)
1ST TRAY SENSORS
(PAPER END, PAPER NEAR END)
PAPER FEED SYSTEM SENSORS
(PAPER FEED, PAPER
REGISTRATION, EJECT)
MT SENSORS
(STAGE POSITION, PAPER END)
DISPOSAL TONER SENSOR
HEAT ROLLER TEMP
OHP
TEMPATURE
HUMIDITY
HEAD TEMP
DENSITY
ANALOG
SW
32MHz
HIGH VOLTAGE POWER
SUPPLY SERIAL INTERFACE