Canon PC-D320 Service Manual page 109

PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service
• Poor printing quality (Evaluation criteria: Check the test print image's faults.)
Before checking for the cause of print defects, check whether the user uses Canon-
recommended paper and stores it correctly. If the problem is solved by using the
recommended paper, the customer should be advised to use the recommended paper and
store it correctly.
Light
Dots
Irregular and
smudged black
horizontal lines
White vertical White horizontal lines
lines
Distortion
nBD failure
Dark Completely blank
Marks on Black vertical
back of paper lines
Marks
Partially compressed/stretched image
Figure 4-5 Faulty Print Samples
4-29
All black
Irregular and smudged
black vertical lines
Blank spots
Poor fixing
Faulty
registration