Canon LBP-1000 User Guide

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Problems and Solutions Without Messages
Another print job starts before the current job is finished?
The flow of data from the host computer has been interrupted for some
reason, and a job timeout has occurred. If data is not received for a
specified length of time, the printer initiates a job timeout and terminates
the job. After the job timeout, the printer automatically switches to the
other interface when there is data waiting.
You may have to increase the I/O TIMEOUT setting or disable it in the
PARALLEL1 MENU or PARALLEL2 MENU (see pages 71 to 73).
Data originally printed as one page now printing as two or more
pages?
If the time interval of the data sent by the software application to the
printer is longer than the time interval before the printer regards a job as
completed (the time to job timeout), the printer executes a job timeout,
prints out only the data that has already been received, and terminates
the job even if it is only partially completed.  If the rest of the data are sent
after the printer terminates the job, then the printer receives the data as
a new job and starts printing on new pages. What was originally
formatted to print on one page has been broken up into two or more
pages.
You may have to increase the I/O TIMEOUT setting or disable it in the
PARALLEL1 MENU or PARALLEL2 MENU (see pages 71 to 73).
Printer not printing at 1200 dpi?
The printer does not have sufficient memory to recreate the entire page
at 1200 dpi. Memory Reduction Technology has compressed the data
to print at the highest possible resolution with the available resources.
For consistent 1200 dpi printing of complex pages (i.e. pages with a
large amount of graphics), you may need additional memory. Add
memory DIMMs to your printer main circuit board (see 
Getting Started
Guide).
Printing stops midway during a job and won’t print the remaining
pages?
The flow of data from the host computer has been interrupted for some
reason and caused a timeout. If no data are received for a specified
length of time, the job is terminated.
You may have to increase the I/O TIMEOUT setting or disable it in the
PARALLEL1 MENU or PARALLEL2 MENU (see pages 71 to 73).
Printing overlap
Printing pages
Printing resolution
Printing stops