Lexmark C925 Service Manual and Parts List Manual

This manual is in the PDF format and have detailed Diagrams, pictures and full procedures to diagnose and repair your Lexmark C925 copier.
You can print, zoom or read any diagram, picture or page from this Service Manual. Every chapter on this manual is fully detailed and contain all the simulation codes, trouble codes, maintenance procedures, reset procedures, diagnose procedures of Lexmark C925 photocopier. You can find easily everything what do you need.
To see what contain, please read table of contents:

Notices and safety information
Safety information
Navigation buttons
Change history

General information
Maintenance approach
Printer configurations
Options and features
Printer specifications
Power specifications
Electrical specifications
Paper specifications
Paper sizes supported by the printer
Media types
Media weights
Media guidelines
Paper characteristics
Unacceptable paper
Selecting paper
Tools required for service

Initial check
POR (Power-On Reset) sequence
Print quality issues
Repeating defects
One color missing
Contaminated background
Lowered print density
White stripes
Uneven print
Partial dirt
Repeating marks
Black stripes
Unprinted spots
Partially dark or light print
Black page
No print
Stain on back of page
Failure to fuse
Stains on edge of page
Skewed print
White gaps due to poor color registration
Paper jams
iv Service Manual
Clearing and troubleshooting paper jams
200 paper jam
201 paper jam
203 paper jam
230 paper jam
231-39 paper jam
24x paper jam
250 paper jam
Duplex unit service check
Paper path service checks
Paperfeed unit service check
Expansion paper feeder service check
Error codes
149.01 Abnormal exit motor
941.05 Abnormal EEPROM
950.xx Service NCVRAM Mismatch
952.xx Service NV Failure
953.xx Service NVRAM Failure
954.xx Service NVRAM Failure
955.00 Service Code CRC
956.xx Service System Board
957.xx Service System Board
958.xx Service NAND Failure
959,xx Service Invalid Firmware
960.xx Service Memory Error
961.xx Service Memory Error
964.xx Service Emulation Error
975.xx Standard network or Network Card X
976.xx Standard network or Network Card X
982.xx Service
990.xx Service
991.xx Service Card
1xx / 9xx Error code service checks
111.01 Black printhead error
112.01 Cyan printhead error
113.01 Magenta printhead error
114.01 Yellow printhead error
121.01 Thermistor 1 error
121.02 Thermistor 2 error
121.03 Thermistor 3 error
121.04 Belt thermistor error
121.05 Fuser fuser heater error
Abnormal fuser temperature error
126.xx Power switch error
130.xx High voltage power supply error
132.00 Density sensor error
132.xx Abnormal theta sensor
136.xx Temperature humidity sensor error
140 Drive motor error
149.01 Fuser / paper exit motor error
146.01 Tray1error
146.03 Tray 3 error
146.04 Tray 4 error
146.05 Tray 5 error
171.01 Fuser fan error
172.01 Power supply unit fan error
173.01 Main unit fan error
174.01 Rear fan error
900.xx System software error
941.01 SDRAM R/W error
941.02 MDC error
941.03 CPU error
941.04 MDC controller error
941.05 EEPROM error
950.00-950.29-EPROM mismatch failure
959.xx Service invalid firmware error
User attendance messages
User prompts
User attendance messages (0-99)
Other symptoms
Other service checks
Networking service check (ISP install needed)
USB port service check
False close door service check
Operator panel service check
Insert tray service check
Paper skew service check
Imaging unit (photo developer) missing service check
Option card service check
Serial port
Flash options
DRAM options
Hard disk option
Network card option
Error code 976 Network card x
54 Network Software error
Power supply (Dead machine) service check
Printhead service check
Transfer belt up down check
Unable to print from USB thumb drive service check
Waste toner bottle missing service check
Wrong paper size service check tray1
Wrong paper size service check tray2

Understanding the printer operator panel
Understanding the homescreen icons and their functions
Using the touch-screen buttons
Other touch-screen icons
Administrative menus
Accessing the service menus
Configuration Menu
Entering Config Menu
Reset Separator Roll and Pick Assembly Counter
Reset Maintenance Counter
Reset Fuser Counter
Reset Transfer Belt Counter
Black Only Mode
Print Quality Pages
Fuser Speed
Color Trapping
Tray Insert Message
Panel Menus
PPDS Emulation
Download Emuls
Demo Mode
Factory Defaults
Energy Conserve
Auto Align Adj
Color Alignment
Paper Prompts
Envelope Prompts
Action for Prompts
Jobs On Disk
Disk Encryption
Erase all information on Disks
Font Sharpening
Wipe All Settings
Require Standby
LES Applications
Key Repeat Initial Delay
Key Repeat Rate
Clear Custom Status
USB Speed
Automatically Display Error Screens
Exit Config Menu
Diagnostics mode
Entering Diagnostics mode
Diagnostic mode menus
Print Tests (input sources)
Print Quality Pages
Panel Test
Button Test
Serial Wrap Test
USB HS Test Mode
Quick Disk Test
Disk Test/Clean
Flash Test
Input Tray Tests
Serial Number
Engine Setting (1-16)
Model Name
Configuration ID
Reset Color Calibration
Cal Ref Adj
Par 1 Strobe Adj
Display Log
Print Log
Clear Log
Theory of operation
Print engine theory
Electrophotographic Process (EP Process)
MFP electrophotographic process basics
Step 1: Charge
Step 2: Expose
Step 3: Develop
Step 4a: First transfer
Step 4b: Second transfer
Step 5: Fuse
Step 6: Clean/Erase
Paper path components
Paper feed
Feeding paper from a tray
Feeding paper from the MPF
Color theory
What is RGB color?
What is CMYK color?
How is color specified in a document to be printed?
How does the printer know what color to print?
Should I use PostScript or PCL emulation? What settings produce the best color?
Why doesnt the printed color match the color I see on the computer screen?
The printed page appears tinted. Can I adjust the color?
My color transparencies seem dark when they are projected. Is there anything I can do to improve the color?
What is manual color correction?
How can I match a particular color (such as a corporate logo)?
What are detailed Color Samples and how do I access them?

Handling ESD-sensitive parts
RIP board/operator panel replacement
Printhead controller board / engine board replacement
eSF solutions backup
Removal procedures
Arrangement of removals in this chapter
Cover removals
Rear cover removal
Operator panel bezel removal
Operator panel removal
UICC card removal
Touchscreen removal
Top cover removal
Left cover removal
Front door removal
Front logo cover removal
Top removals
Output bin full sensor actuator removal
LED assembly removal
LED print head removal
Op panel paper exit guide removal
Paper exit guide removal
Bin full sensor removal
Paper exit sensor removal
Printhead controller board removal
Speaker removal
Top EMI sheild removal
Front removals
Transfer belt CRU removal
Transfer belt position sensor removal
Paper size sensor removal
Photoconductor lock removal
Cassette stopper removal
Left side removals
ISP option board removal
Left EMI shield removal (not a FRU)
Low volt power supply removal
Main fan removal
Power supply fan removal
RIP board removal
Video board removal
Theta sensor removal
Density sensor removal
Main switch removal
Right side removals
Fuser removal
Handle cover removal
Duplex removal
Paper feed unit removal
Transfer Roll CRU removal
Rear removals
Drive Unit removal
Drive unit motor C/M/Y/K removal
Sub drive unit removal
Door interlock switch removal
Duplex solenoid removal
Fuser entry sensor removal
Engine board (MDCONT) removal
Fuser Fan removal
Fuser exit drive unit motor removal
Papertray lift motor removal
Toner sensor removal
Transfer belt motor removal
Temperature and humidity sensor removal
Rear fan removal
Sub frame unit removal
Paper size switch removal
Rear EMI shield removal- Not a FRU
Paper feed motor removal
HVPS removal
Waste toner sensor removal
Duplex unit component removals
Duplex clutch removal
Duplex timing belt removal
Duplex exit / MPF sensor removal
MPF clutch removal
MPF tray assembly removal
Paperfeed unit component removals
Separating the MPF tray and main tray paperfeed units
Main tray paper guide removal
Multi-purpose feed tray paper guide removal
Paperfeed unit clutch removal
Registration sensor (MPF tray) removal
Registration sensor actuator removal
Static discharge brush removal
Torque limiter removal
Upper and lower registration springs removal
Paperfeed maintenance kit removals
Pick roll removal
Paperfeed roll removal
Separator roll removal
Registration roll removal
MPF roll removal
MPF pad removal
Exit guide (paper exit) roll removal
Option paper feed removals
Paper feed roll removal
Pick roll removal
Separator roll removal
Paper size switches removal
Paper level sensor removal
Transport sensor removal
Paper empty sensor removal
Paper full sensor removal
Option controller board removal
Stepper motor removal
Tray lift motor removal
Option door inter lock switch removal
Paper feed clutch removal

Left front
Print engine diagram
Printer motors
Printer boards
RIP board
Video board
Printhead controller board
Engine board
Connector values
Option feeder locations
Option feeder layout
Option board layout
Option board connector values

Safety inspection guide
Lubrication specifications
Scheduled maintenance

How to use this parts catalog
Assembly 1: Cover1
Assembly 2: Cover 2
Assembly 3: Duplex components 1
Assembly 4: Duplex components 2
Assembly 5: Paper exit
Assembly 6: Base 1
Assembly 7: Base 2
Assembly 8: Base 3
Assembly 9: Paperfeed
Assembly 10: Electrical 1
Assembly 11: Electrical 2
Assembly 12: Upper assembly
Assembly 13: Printhead controller board cables
Assembly 14: Paper trays
Assembly 15: Fuser
Assembly 16: 550 sheet option feeder covers
Assembly 17: 550 sheet option feeder base
Assembly 18: 550 sheet option feeder paperfeed
Assembly 19: 550 sheet option feeder tray
Assembly 20: Maintenance kits, power cords, and options

Part number index

Number of pages: 358.