Canon BJC-820 Service Manual page 62

BJC-8200
11. Paper Feed
Error/Paper
Jam Error
<Measure>
Visually check the paper
feed unit
OK?
Yes
Switch on with the cover
open
Check the operation of
paper feed unit
OK?
Yes
Paper feed check
OK?
Yes
Check the paper end
sensor arm
OK?
Yes
Replace the logic board
<Cause>
Paper feed operation fails to feed paper. Paper eject
operation fails to eject paper.
<Suspected parts>
• Check for paper jams, gear
deformation/damage/missing teeth.
• Is the paper thickness lever's position correct?
See Part1: 2.2.1 Paper sizes (Page 1-4)
No
Repair or replace faulty parts
Cover-open sensor ON
• Check the paper feed motor, pick-up roller, paper feed roller, and eject
roller for movement during initialization. (Pick-up roller does not
rotate during initialization while the carriage is at home position.)
• Check for abnormal sounds.
• Check the paper feed motor for out-of-step.
No
Repair or replace faulty parts
Replace logic board
Check if the pick-up roller rotates and the
ASF feeds paper normally.
No
Check auto sheet feeder unit
Using paper, check the arm for smooth
motion, deformation, or damage.
No
Replace the paper end
sensor arm
4-11
Part 4: TROUBLESHOOTING
Paper feed section, paper end sensor,
logic board
• Check the pick-up roller's rubber rings and
the separation sheet for cleanliness, wear, or
degradation.
• Check the rod cam for engagement.
• Check the gears for deformation/damage
and Mylar damage. Perform roller cleaning.
(See Part 3: 2. SERVICE MODE , Page 3-8)