Question about Lexmark T642 Laser Printer
I too ran into this problem. Printer is about 2-1/2 yrs old.
Using it as a network device. I updated firmware from
a Mac OS X computer on the network.
a. Uploaded the firmware by going to lexmark site.
Do this first in preparation of upgrading firmware.
Follow instructions to get firmware update.
b. power cycle the printer (turn off & unplug power from unit)
c. power printer and turn switch back ON.
happily printer stays alive long enough to upload the new
d. Log on to your printer via a computer on your network
Open a browser, address will be your printer's IP address
or dns name. ex: http://192.168.1.3 (note: if you password
protected the account, you will need that info)
e. Follow menu to Configure -> Update Code where you will
"browse" to the file on your local computer (ex:
LSSTN234.FLX) and then hit the FLASH button
Posted on Feb 08, 2008
This looks like you must update the engine code
Posted on Dec 18, 2007
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Posted on Jan 02, 2017
Tips for a great answer:
The 900 error usually indicates a software or communications problem. Please try to do the following.
Jul 25, 2011 | Lexmark Optra T620 Laser Printer
Aug 14, 2008 | Lexmark Office Equipment & Supplies
The 900 error usually indicates a software or communications problem. If the 900 error occurs only when the printer is receiving information from a network or computer, you should contact your software/network support. If the error occurs when the printer is idle or not connected to the network or PC, there may be a printer hardware or connection problem. Sometimes a bad connection with an Internal Network Adapter/Network Card can cause the problem. The first thing to check is the base printer.
To check the base printer
Turn off the printer and disconnect every cable, except for the power cord.
Turn on the printer and see if the error returns.
If the error does not return, try to print a test page from the Test Menu.
If the test page prints correctly, the printer
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