Scanning Speed Is Slow - Canon imageFORMULA P-215 Service Manual

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
The feeding load is
heavy
Insufficient power
supply
Insufficient com-
puter memory
Hi-Speed USB 2.0
not supported
5-22
Step Check Item
1 Does the machine temporary
stop occur frequently?
2 Was the problem solved by
using a power supply USB
cable (or an optional AC
adaptor)?
3 Is the memory sufficient?
4 Are other applications run-
ning?
5 Are resident
such as a virus protection
program running?
6 Is there insufficient hard disc
space?
7 Is the USB port supported?
8 Is the USB cable supported?
9 Is the USB hub supported?
Bus power type cannot be
used.
Self power type can be used,
but it is not guaranteed.
Table 5-405
COPYRIGHT © CANON ELECTRONICS INC. 2011
Result
YES
YES
NO
YES
applications YES
YES
NO
NO
NO
Action
Perform steps 1 to 8 in
"4. Scanner Does Not
Feed Properly".
Done.
Increase the memory.
Close the unneces-
sary applications.
Close the unneces-
sary applications.
Increase the hard disc
space.
Use a computer that
supports it.
Use the supplied USB
cable.
Use a USB hub that
supports it.
CANON P-215 FIRST EDITION