Canon ImageRunner iR8500 Series Service Manual page 618

Chapter 13
1. As a rule, perform scheduled servicing work every 250,000 pages.
2. Before setting out for a scheduled visit, check with the Service Book, and take parts that are likely to need replacement.
3. Whenever you have cleaned a charging wire, make sure it is completely dry before mounting it back to the machine.
4. If the power plug is left connected for a long time in an area subject to excessive dust, umidity, or smoke (containing oil vapor), an insulation
fault and, ultimately, a fire can occur (owing to the build-up of moist dust).
Be sure to disconnect the power plug on a periodical basis, and wipe the area and the power plug clean with a dry cloth.
No. Step
1
2
3
4
Points to Note When Cleaning/Replacing the Charging Wire or Replacing the Charging Wire Cleaner
At the end of the following, always check to make sure that the charging wire is in the middle of the charging wire cleaner; otherwise, image faults can
occur:
a. If you have cleaned the charging wire.
b. If you have replaced the charging wire.
c. If you have moved the charging wire cleaner by hand.
d. If you have replaced the charging wire.
13-26
Checks
Checks Check the general condition.
Take notes of the counter Check the faulty copies:
readings.
Make test prints. a. Image for density
b. White background for
soiling
c. Characters for clarity
d. Margin along leading
edge
e. Fixing, registration, and
back (for soiling)
Clean the charging
assemblies:
- Charging wire (primary,
pre-transfer, transfer/
separation)
- Grid wire (primary
charging
assembly)
- Shielding plate (each
charging
assembly)
- Roller electrode
T-13-20
Remarks
Standard (single-sided)
Leading edge: 4.0
+1.5/-1.0 mm
Left/right: 2.5 ±1.5 mm
Trailing edge: 2.5 ±1.5
mm
Standard (single-sided)
Leading edge: 4.0
+1.5/-1.0 mm
Left/right: 2.5 ±1.5 mm
Trailing edge: 2.5 ±1.5
mm
F-13-24
T-13-21
Correct
As of October 2004