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magicolor 330 - Base Engine Service Manual 5-3
Primary Fault Isolation Procedures
The Use of Diagnostics Test Print
Image Quality FIPs may ask you to generate a Test Print to help isolate the cause of an image quality problem. Follow
the instructions in each FIP to evaluate the Test Print.
If the printer can generate a normal Test Print on request, then the Controller PWB, the host software, or the interface
cable between the printer and the host computer is most likely the cause of the image quality problem.
1. Remove Right Cover Assembly (RRP 9.8).
2. Remove the Controller PWB (RRP 9.129) so you can access the MCU PWB.
3. Remove the access panel beneath the Controller PWB.
4. At the PJ3 location you will find a switch. Move the PJ3 switch to the "ON" position.
5. Switch on printer main power.
6. The printer generates process black (all four colors layered) grid patterns.
7. The printer feeds from the first tray that has paper - in this order; Tray 1, Tray 2, Tray 3, Tray 4, and MSI. The
printer sends the test prints to the Face Down Output Tray.
8. The printer generates test prints until you stop the test. To stop generating test prints, move the switch to the "1"
position.
Image Quality FIPs often ask you to stop the printer at a specific point in the print cycle; such as
"before the paper reaches the Fuser". You may have to use trial and error until you are able to stop
the print cycle at the exact point requested.