Canon BJC-620 - Manual (Page 53)

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Your printer requires little routine maintenance. Perform the following
maintenance, as necessary, to keep your printer in good operating condition.
Be very careful when cleaning the printer. Make sure the printer is turned off;
then unplug it.
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z Use a soft cloth to remove any ink mist or paper debris.
z Do not rub the gear wheels.
z Do not use any oil or cleanser inside the printer.
z When cleaning inside the printer, avoid the area near the print head unit and
ink tanks. Do not touch the print head nozzles. Ink may leak out and cause
stains.
z Do not move the print head unit from the home position.
z Do not use paper products (such as paper towels or tissues) to clean the
inside of the printer. They may leave paper particles inside the printer.
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Chapter 4