Diagnostic Information 2-59
4025-XXX
Print Quality Service Checks
Using Diagnostic Test Print
Print Quality Service Checks may ask you to generate a Test Print to help isolate the
cause of an image quality problem. Follow the instructions outlined in each Service
Check to evaluate the Test Print. If the printer can generate a normal Test Print on
request, then the ESS PWB, or the host software, or the interface cable between the
printer and the host computer are most likely the causes of the image quality problem.
Image Quality Service Checks 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 in the Service
Check.
2 PAPER FEED TEST
Enter Diagnostic Mode and select Duplex Quick Test.
The Face Up Clutch and the Exit Gate Solenoid should
operate.
Do the Offset Rollers rotate? Does the Exit Gate Solenoid
actuate during the Quick Test?
Go to step 3 Replace the
“Offset/Exit
Assembly”
on page 4-69
3 MCU PWB REPLACEMENT
Replace the “Engine Board (MCU PWB)” on page 4-92.
Does Offset work correctly?
Problem
solved
Go to step 4
4 I/O PWB REPLACEMENT
Replace the “I/O PWB” on page 4-89.
Does Offset work correctly?
Problem
solved
Go to step 5
5 The following printer FRUs and areas are associated with this
specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using the steps in this Service Check, replace each
FRU or troubleshoot each area listed below, one at a time, until
you isolate and solve the problem.
• Wiring and connectors linking the FRUs
• LVPS - Go to “Low Voltage Power Supply (LVPS)
Assembly” on page 4-82.
Step Actions and Questions Yes No
To Next Page
Loading...
