Canon imagePRESS C800 Series Technical & Service Manual page 38

Maintenance and Service
4. Clean the corona wires
If stripes appear on printed output or random parts of the printed image are missing, clean
the corona assembly wires inside the main unit.. The procedure takes approximately 35
seconds to finish.
5. Clean the rollers of the ADF
If your originals have black stripes or appear dirty after transporting them through the feeder,
clean the rollers of the feeder. The procedure takes approximately 20 seconds to finish.
6. Clean the scanner sensors
Procedure for cleaning the sensors of the scanner/reader.
7. Refresh the fixing belt
When paper with a longer width is used after copying or printing 100 or more sheets of paper
with a shorter width (for example, when you use A3 paper after A4R paper), gloss lines may
appear on both edges in the feeding direction. In addition, patches of uneven gloss may
appear in the high density areas of the printed heavy paper or coated paper. In this case, the
lines and patches of uneven gloss may be reduced by refreshing the fixing roller and cleaning
its surface.
System service and engine service mode
To enter service mode via the maintenance screen:
1. Select the [Go to the service mode] button.
2. Enter the PIN
3. The following screen is displayed:
• Select [System Service] to access the PRISMAsync service mode.
For a detailed description see:
• Select [Engine Service] to access the print engine service mode during printing. This mode is
used for monitoring and analyses during printing.
For a detailed description see:
NOTE
The Engine Service mode (during printing) is only accessible via the [Maintenance] tab in normal
user mode.
38 Chapter 4 - Using the PRISMAsync
System service mode (PRISMAsync service mode) on page 39
Engine service mode (during printing) on page 42