Diagnostic Information 2-63
4025-XXX
2 CONTROLLER OR HOST SOFTWARE ISOLATION
Generate a Test Print.
Is the test print image normal?
Replace the
“Controller
Board (ESS
PWB)” on
page 4-94 or
reload the
host software
Go to step 3
3 EP CARTRIDGE REPLACEMENT
Install a new EP Cartridge.
Is there a normal image on the paper?
Problem
solved
Go to step 4
4 IMAGE DEVELOPMENT INSPECTION
Remove the Rear Cover.
Generate a Test Print and switch OFF printer power halfway
through the print cycle.
Open the Left Upper Cover.
Open the Drum Shutter.
Hand rotate (counterclockwise) the Main Drive Motor to
advance the Drum far enough so you can see the developed
image area on the Drum before
it reached Transfer.
Is the image on the drum completely developed; with
sharp, black, easily read areas and clear, white areas?
Replace the
“BTR
Assembly”
on page 4-61
Go to step 5
5 ESS PWB REPLACEMENT
Replace the “Controller Board (ESS PWB)” on page 4-94.
Generate a Test Print.
Is the printed Test Pattern normal?
Problem
solved
Go to step 6
6 MCU PWB REPLACEMENT
Replace the “Engine Board (MCU PWB)” on page 4-92.
Generate a Test Print.
Is the printed Test Pattern normal?
Problem
solved
Go to step 7
7 PRINTHEAD REPLACEMENT
Replace the “Printhead Assembly” on page 4-57.
Generate a Test Print.
Is the printed Test Pattern normal?
Problem
solved
Go to step 8
8 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.
• LVPS - Go to “Low Voltage Power Supply (LVPS)
Assembly” on page 4-82.
• I/O PWB - Go to “I/O PWB” on page 4-89.
• Refer to the wiring diagrams and check for a broken wire or
loose connection between FRUs in the Xerographic sections of
the printer
Step Actions and Questions Yes No
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