Marks are printed on the transfer belt and the sensor reads them for calibration.Couldnt tell you off hand with out looking at one where it is.(will be included) - HP Jet Direct en3700 external print server - Fast Ethernet Internet connector for sharing peripherals with USB ports, in a 10/100 TX LAN environment - Has one USB 2.0 printer port and one RJ-45 10/100 Base-TX connector - Includes software and power module - HP Jetdirect 635n IPv6/IPsec Print Server - 10Base T and 100Base TX LAN interface board - Plugs into peripheral EIO slot - Has an RJ-45 connector - Comes with software on CD-ROM and manual on CD-ROM; Click to order the functional equivalent: J7961-69011 - HP Jetdirect 630n IPv6 Gigabit Print Server - Provides 10Base T, 100Base TX, or 1000Base T interface - Plugs into peripheral EIO slot - Has an RJ-45 connector - Comes with software on CD-ROM and manual on CD-ROM - Ship your product to us for a small diagnostic fee; and a professional service job.We will contact you with repair total and your diagnostic fee will be waived if unit is repaired.The HP Laser Jet Printer Remote Firmware Update file available from the HP web site contains firmware for the printer, embedded Jet Direct (if applicable), HP paper handling accessories used with the device in one convenient download file.
What is included in a Remote Firmware Update (RFU)?Installation instructions are provided for Single and Multiple Printer Updates.This document provides specific update, installation and troubleshooting information.The message appears regardless of firmware version, and was still happening with the latest cp3505 firmware as of July 2009 (CLJCP3505fw_win_03_021_220090604 03.021.2).After 2 other unrelated calls to hp during the past year for the cp3505dn, I finally raised a call regarding this problem.Ok, I ran the full calibration with the new transfer belt, still same results. Yes, I did a full calibration with a known good transfer belt.Either out of the blue or after replacing a laser scanner assembly, DC controller or formatter, having one (or more) colors print out of alignment.The new Color Laser Jet CP3505 (similar to the Color Laser Jet 3000, 3600, 3800 series) has a firmware bug which can trigger a False "50.2 Fuser Error" when printing envelopes...If a user gets a steady "50.2 Fuser Error" when trying to print envelopes from the MP tray (envelopes only, not regular paper) -- you should upgrade to the latest firmware ...A firmware update may be necessary if it is determined that you may benefit from the resolution of any issue that is documented below.These updates are available on the HP support web site.The solution recommended by the hp call center chap was to change the printer wake-up mode from "save energy" to "faster first page".I even had an hp subcontracted engineer come in and a) confirm the latest firmware and b) change the setting for me.Service manuals, Parts Catalogs, Error Codes, Troubleshooting, Service Menu, Adjustment, Reset Codes, Compatible Devices, Equivalents Parts and Circuits diagrams. You can print your Parts List or export to Excel to further work with him.