Service manual

1-4 IP-421 PRINT CONTROLLER
Chapter 1 Overview
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● Startup sequence of the 7020 series + IP-421 system
As the IP-421 is built in the 7020 series, supplying power to the IP-421 and its initialization starts as soon as you
turn on the copier. The startup sequence is as follows.
1. Turn on the copier.
Supplying power to start the IP-421 starts. Its CPU works to test the system memory and the
system program starts running.
2. The IP-421 performs system check.
3. On completion of system check, the controller is waiting print job.
If printer mode is selected, a message “Ready to print” appears.
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● Data processing of the IP-421 (See data flow)
When you attempt to print a document data from a computer connected the IP-421, processing will be made as
follows.
1. The print job comes from the computer (or network) to the parallel port (or Ethernet port if the KN-303 is
used).
2. The CPU, mounted on IP-421, generates the bit map image of one page to another in the image
memory.
3. The bit map image is transferred in the form of video signals from the image memory to the copier and
printed.
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