Diagnostic Information; Start; Using Service Checks - Lexmark W850n Service Manual

2. Diagnostic information

Start

CAUTION: Unplug the power cord from the electrical outlet before you connect or disconnect any cable
or electronic board or assembly for personal safety and to prevent damage to the printer. Disconnect any
connections between the printer and PCs/peripherals.
CAUTION: The printer weighs 47.7 kg (105 lb.) and requires at least two people to lift it safely. Make sure your
fingers are not under the printer when you lift or set the printer down.
CAUTION: If the printer is kept on, never touch the conductive parts while it is not specifically required. The
power switch and inlet of the low voltage power supply card (LVPS card) assembly is live even while the power
supply is cut off. Never touch the live parts.
Warning: When operating the driving units using the diagnostics or other tools, be sure to keep them covered
unless otherwise specified.
Warning: When operating the driving units using the diagnostics or other tools, never touch the driving units.
When operating the driving units using diagnostics or other tools, be sure to follow the procedures
in this manual.
CAUTION: Be careful to avoid burns by safely handling hot parts.
Warning: Servicers should wear a wrist band or the like to remove static electricity from their body, grounding
their body while working. See

Using service checks

•
Verify the installation status. See
•
Does POR (power on reset) stop? Check the POR sequence. See
on page 2-2.
To determine the corrective action necessary to repair the options, use the following table:
If the error code or message
appears in the
2X 500-Sheet Drawer (2TM)
2000-Sheet Dual Input (TTM)
High Capacity Feeder (HCF)
Duplex (DUP)
Exit 2 (EX2)
User attendance messages are in the User's Guide.
Note: There may be printer error code messages that are not contained in this service manual. A more
complete list appears in the Printer Service Manual.
"Handling ESD-sensitive parts" on page
"Confirm the installation status" on page
Go to
"Error code messages - 2X 500-
sheet drawer (2TM)" on
page 2-3
"Error code messages - 2000-
sheet dual input (TTM)" on
page 2-36
"Error code messages - HCF"
on page 2-69
"Error code messages - DUP"
on page 2-83
"Error code messages - EX2"
on page 2-92
4-1.
2-2.
"POR (Power-On Reset) sequence"
For additional information, see
"Service checks—2X 500-sheet
drawer (2TM)" on page 2-5
"Service checks - 2000-sheet
dual input (TTM)" on page 2-38
"Service checks - HCF" on
page 2-70
"Service checks - DUP" on
page 2-84
"Service checks - EX2" on
page 2-93
Diagnostic information
4024-110
2-1