Lexmark W820 - Page 175

Diagnostic Information 2-79
4025-XXX
Steps 4 through 11 attempt to find a faulty printer FRU that may be generating electrical noise. If replacing
a FRU does not solve the problem, reinstall the old FRU before moving on to the next step.
4 EP CARTRIDGE REPLACEMENT
Replace the EP Cartridge.
Is the Electrical Noise problem still present?
Go to step 5 Problem
solved
5 HVPS REPLACEMENT
Replace the “High Voltage Power Supply (HVPS)
Assembly” on page 4-88
Is the Electrical Noise problem still present?
Go to step 6 Problem
solved
6 AC DRIVER REPLACEMENT
Replace the “AC Driver PWB 120/230 VAC” on page 4-86.
Is the Electrical Noise problem still present?
Go to step 7 Problem
solved
7 LVPS ASSEMBLY REPLACEMENT
Replace the “Low Voltage Power Supply (LVPS) Assembly”
on page 4-82
Is the Electrical Noise problem still present?
Go to step 8 Problem
solved
8 FUSER ASSEMBLY REPLACEMENT
Replace the “Fuser Assembly” on page 4-65.
Is the Electrical Noise problem still present?
Go to step 9 Problem
solved.
9 MCU PWB REPLACEMENT
Replace the “Engine Board (MCU PWB)” on page 4-92.
Is the Electrical Noise problem still present?
Go to step 10 Problem
solved
10 MAIN DRIVE ASSEMBLY REPLACEMENT
Replace the “Main Drive Assembly” on page 4-79
Is the Electrical Noise problem still present?
Go to step 11 Problem
solved
11 The following FRUs are associated with this specific problem.
One or more of these FRUs may have failed partially or
completely. If you cannot isolate the problem using this Service
Check, replace each FRU listed below, one at a time, until the
problem disappears.
• Lift Motors - Go to “Tray 1 Lift Motor” on page 4-13.
• Feed Clutches - Go to “Tray 1 Feed Clutch” on page 4-14.
• Printhead Assembly - Go to “Printhead Assembly” on
page 4-57.
• Offset Unit - Go to “Offset/Exit Assembly” on page 4-69.
• ESS PWB - Go to “Controller Board (ESS PWB)” on
page 4-94.
• I/O PWB - Go to “I/O PWB” on page 4-89.
Step Actions and Questions Yes No