4. Block diagram functional descriptions
Descriptions of each block
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 not connected
to USBCONN.
→
Data sent from the external device connected to USBCONN is
printed.
The external device connected to PARACONN is not recognized.
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.
DM-1505
11 – 13
manuals4you.com
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