5-22
COPYRIGHT © CANON ELECTRONICS INC. 2011
CANON P-215 FIRST EDITION
CHAPTER 5 TROUBLESHOOTING
5. Scanning Speed is Slow
The scanning speed differs according to scanning conditions. If high resolution, color set-
tings, or special functions are set, the speed decreases. The speed when using one USB cable
is lower than that when using two USB cables.
There is no problem with USB 3.0, but if a single USB2.0 cable is used, the power supply is
low and the scan speed may change significantly due to differences (variations in properties of
parts) of the products. Therefore, the speed may decrease after parts replacement or reas-
sembling, but it is not a failure if the speed specification is satisfied.
If the scanning speed is still slow after taking the above into consideration, the cause may be
as follows.
Cause/Faulty
Location
Step
Check Item
Result
Action
The feeding load is
heavy
1
Does the machine temporary
stop occur frequently?
YES
Perform steps 1 to 8 in
"4. Scanner Does Not
Feed Properly".
Insufficient power
supply
2
Was the problem solved by
using a power supply USB
cable (or an optional AC
adaptor)?
YES Done.
3
Is the memory sufficient?
NO
Increase the memory.
4
Are other applications run-
ning?
YES
Close the unneces-
sary applications.
5 Are resident applications
such as a virus protection
program running?
YES
Close the unneces-
sary applications.
Insufficient com-
puter memory
6
Is there insufficient hard disc
space?
YES
Increase the hard disc
space.
7
Is the USB port supported?
NO
Use a computer that
supports it.
8
Is the USB cable supported?
NO
Use the supplied USB
cable.
Hi-Speed USB 2.0
not supported
9
Is the USB hub supported?
Bus power type cannot be
used.
Self power type can be used,
but it is not guaranteed.
NO
Use a USB hub that
supports it.
Table 5-405