Testing And Cleaning The Bj Cartridge Print Head - Canon FAX-B840 User Manual

Cleaning the scanner components
• If the scanner components are dirty, the documents you send or copy will also be dirty.
• Use a soft, lint-free cloth.
Do not use tissue paper, paper towels, or similar materials for cleaning.
1 Disconnect the power cord from the fax, then open the printer cover.
2 While holding the white sheet open, clean the
components.
Wipe with a clean, soft, lint-free cloth moistened with water, then wipe with
a clean, soft, dry, lint-free cloth.
3 When you are finished, close the printer cover and
reconnect the power cord.
Be sure to close the printer cover until it locks into place.

Testing and cleaning the BJ cartridge print head

The print head in the BJ cartridge contains nozzles through which ink is propelled onto the paper. To maintain the
best possible print quality, these nozzles need to be cleaned from time to time. Your fax is equipped with a print head
cleaning function that does this.
Printing the nozzle check pattern
Before cleaning the print head, you may want to print the nozzle check pattern to test the print head of the BJ
cartridge installed in the fax. This test shows if each print head nozzle is operating properly.
1 Press [Function], then press [Cleaning].
2 Use [ ] or [ ] to select NOZZLE CHECK, then press [Start/Copy].
The fax prints the nozzle check pattern.
Print the nozzle check pattern again after cleaning the BJ cartridge print head to check if cleaning corrected the problem.
White sheet
Scanning glass
Nozzle check pattern
If the pattern is broken or missing,
clean the BJ cartridge print head
(see p. 58).
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