Question about Lexmark X204n 4-in-1 Laser Printer
A 900 Firmware error means that something has corrupted the code on your printer.
The easiest way to fix this is to go to www.lexmark.com > Support > Downloads and download the latest firmware for your printer.
Posted on May 27, 2011
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Posted on Jan 02, 2017
Tips for a great answer:
Apr 14, 2011 | Lexmark X544dn All-In-One Laser Printer
[SC900] - replace fuse 8 0 4, DC power supply
[SC900] - replace black total counter
[SC900] - CN4 0 3 SCU PCB, poor connection
[SC900] - replace SCU PCB, see FSM page 5 64 for rom and dip switch info
Total counter error: Fuse #5 on PSU blown
Total counter error: Total counter defective
[SC900] - NV ram defective
[SC900] - re load copier firmware
[SC900] - replace counter harness
Electrical counter fail - Replace Mechanical Counter
Electronic counter error - Replace NVRAM-B098 9590.
[SC900] - replace IOB PCB
[SC900] - NVRAM defective
Electrical total counter error - NVRAM data defective
Jan 28, 2011 | Ricoh Aficio 450 Copier
Before you download firmware, the 900 error usually indicates a software or communications problem. Please try to do the following.
Disconnect every cable, except for the power cord and turn off the printer for 30 seconds or more to clear its memory
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