Canon imageFORMULA ScanFront 400 Service Manual page 150

CHAPTER 5 TROUBLESHOOTING
3. Scanner Does Not Feed Properly
Note: A "paper jam" or "double-feed" error message may be displayed due to a sensor problem.
Cause/Faulty Lo-
cations
Document
Placing documents
Feed selection lever
Rollers
Parts in feed path
Drive transmission
system
Motors
Sensors
Sub PCB
Ultrasonic drive PCB
Control PCB
Note: For passports and A4 carrier sheets
・For details about conditions for scanning a passport and how to set the passport, refer to the
user manual.
5-58
Step Check Item
1 Specified document?
(thickness, size, fold or curl)
2 Are documents stuck
together?
3 Is the posit ion of the
document guide correct?
4 Do you use the extension
support?
5 Is the f eed
lever switched
appropr iate position?
6 Are the rollers and t he
roller covers attached
correctly?
7 Are they dirty or deformed?
8 Parts touching
installed properly? (no float,
slant or gaps)
9 Is the surf ace touching
documents
scratches or burrs)
10 Does an abnormal noise oc-
cur while feeding?
A r e a n y o f t h e g e a r s
damaged or the belts loose?
11 Is the operation normal when
you perform an operation
check with the service mode?
12 Is the operation normal when
you perform an operation
check with the service mode?
13 Was the problem solved by
replacing the PCB?
14 Was the problem solved by
replacing the control PCB?
Table 5-803
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Result
NO
YES
NO
NO
selection NO
to the
NO
NO
documents NO
NO
smooth? (No
YES
NO
NO
YES
YES
Action
Use documents
compliant with the
specified.
Fan the documents
well.
Correct the position.
Use the extension
support depending on
the document.
Switch to the appro-
priate position.
Attach the rollers
correctly.
Clean or replace the
rollers.
Attach the parts cor-
rectly.
Replace inferior parts.
Attach the parts
correctly.
Replace inferior parts.
Check the cable
connections.
Replace the motors.
Check the attachment of
sensors, sensor levers,
and light guide. Check
the connections of sen-
sor cables.
Done.
Done.
CANON SF-400 FIRST EDITION