AR-PB9 (serv.man2). ARPB9-Service Manual - Sharp Copying Equipment Service Manual (repair manual). Page 11

PCL PWB

Controls PCL print.

CPU

Control IC

Chipset ASIC

Image forming, ROM/RAM access

PLL IC

CPU/ASIC/M66236fp clock
generation

M66236FP

Jitter adjustment IC

I/F ASIC

IEEE1284 parallel conversion
ASIC

EEPROM

Stores device ID and data
necessary for control.

BOOTROM (1)

Stores data necessary for booting
programs.

Code ROM (1)

Stores PCL process program and
fonts.

USS725 USB to
IEEE1284 Bridge

Converts USB standard signals
into IEEE1284 standard signals.

DRAM On board 8
MB

Work RAM for the system and
PCL process

168 pin DIMM
SLOT Max 64 MB

Work RAM for PCL process
(Expanded by expansion RAM.)

Video CONN

Interface connector for
communication between MCU
PWB and PCL PWB

14.31818 MHz

PLL IC reference clock

PCL I/F PWB

Interface PWB for connection of
external device and PCL PWB

PARACONN

IEEE1284 conforming Centronics
connector

USB CONN

USB connector

MCU PWB

Digital copier main control PWB

Operational descriptions
Connected to PARACONN or USBCONN of PCL I/F PWB
(CPWBF0057QS51).
Print data made by page description language is inputted from an ex-
ternal device.

The PCL I/F PWB (CPWBF0057QS51) is provided with two kinds of
connectors for external devices. The suitable connector is determined
according to the connection type with an external device as follows:
● An external device is connected to PARACONN, and not connected

to USBCONN.

→ Data sent from the external device connected to

PARACONN is printed.

● An external device is not connected to PARACONN, but connected

to USBCONN.

→ Data sent from the external device connected to USBCONN

is printed.

● An external device is connected to PARACONN, and connected to

USBCONN.

→ Data sent from the external device connected to USBCONN

is printed.
The external device connected to PARACONN is not recog-
nized.

Data inputted to PCL I/F PWB is inputted to PCL PWB and PCL-
decoded and converted to generate BITMAP data for print.

To generate BITMAP data for print, DRAM On board 8 MB and the ex-
pansion RAM inserted into the 168 pin DIMM are used as the work
area.

BITMAP data generated in PCL PWB are subject to jitter adjustment by
M66236FP, and inputted to MCU PWB through Video CONN to per-
form laser output and print.

AR-PB9

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