Canon S820MG, Service Manual

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Part 2: Troubleshooting
S900/ S820/ S750/ S520
1.3 Simple Printer Operations
The printer has an offline operation mode that works when the printer is not connected
to a computer and the power is on.
To conduct the operations below, with the power turned on, hold down the RESUME
button until the green indicator blinks the specified number of times.
Operation Indicator Blink Count Remarks
Cleaning operation
Nozzle check pattern
Roller cleaning operation
---
Once
Twice
3 times
4 times
---
Load a sheet of paper A4 size or
larger
Load either no paper or A4
No function
1.3.1 Cleaning operation
To start the cleaning operation, turn on the printer and hold down the RESUME
button until the green indicator blinks once. Cleaning will start when you let go of the
button. This is the same as using the printer driver utility to perform cleaning. (The
cleaning operation conducted is the same as using the S750/S520 driver utilities to
clean all of the ink nozzles).
1.3.2 Printing the nozzle check pattern
With the printer turned on, hold down the RESUME button until the green indicator
blinks twice. Let go and the printer will then start printing the nozzle check pattern. If
any printing flaws show up in this test printout, perform print head cleaning.
Use A4/LTR size paper when printing the nozzle check pattern. If the
paper's width is narrower than the nozzle check pattern, the printer will
print on the bare platen, dirtying it with ink.
To stop printing of the test pattern midway, press the POWER button .
Printing will stop and the paper will be ejected. The printer will remain on.
If the problem persists even after conducting cleaning three times, perform
Deep Cleaning from the driver utilities. If that still does not resolve the
problem, replace the print head.