Canon i9100, s520, s750, s820, s820d, s820mg, s830d, s900, s9000 서비스 매뉴얼

After disassembly and reassembly, follow the procedures below to check the printer's
operation.
1) Check visually for any grease or foreign matter contaminating the internal parts.

Make sure that the timing slit strip is clean. If there is any grease on the strip, wipe it
clean with alcohol.

Check for the following: Missing print in the nozzle check pattern, off-position
horizontal lines in the horizontal line pattern, and white stripes in any irregular
printing. If any of these faults are present, clean the print head and adjust the print
head position. Then make another test printout. The procedure is described in 

Be sure to visually check the timing slit strip for any grease, foreign
matter, etc. If there is any grease, etc., on the strip, the printer may
malfunction shortly after repair is completed.

S900 / S820 / S750 / S520