Xerox 5740, 5790 Diagnostics, Service All product configurations, Alternate Boot via Serial Port

XEROX WorkCentre 5735/5740/5745/5755/5765/5775/5790 Information Assurance Disclosure Paper

3.4.Diagnostics

3.4.1.Service [All product configurations]

To access onboard diagnostics from the local user interface, Xerox service representatives must enter a unique 4-digit password. This PIN is the same for all product configurations and cannot be changed.

For additional security, a Xerox authorized service representative can enable a “secure diagnostics” mode. In this mode, the service representative must enter two PINs to access onboard diagnostics. When enabling the secure diagnostics mode for the first time, the service representative should change the PIN to something known only to him or his local team. On subsequent logins, the secure diagnostics PIN must be entered followed by the standard diagnostics PIN in order to gain access to the diagnostics menu.

3.4.2. Alternate Boot via Serial Port

Alternate Boot (Alt-boot) is a means for the Portable Service Workstation (PSW) to directly connect to the controller. The primary purpose of Alternate Boot is to provide the capability to boot the controller in case of hard disk failure, to perform system diagnostics, and load controller software, independent of other sub-systems.

To enter this mode a user must strike any key on the PSW within 10 seconds of power on. If the 10 seconds times out, then the normal boot sequence occurs and the serial port acts as a typical tty (see next section). However, if this mode is entered, a Xerox unique serial protocol is used to communicate to the alt-boot code. All commands are DOS-type menu driven (i.e. type in a number to start a command). If a PSW is connected, the application on the PSW cannot be accessed without logging on with a password (see next section).

If the PSW is used and is successfully logged on, then the Ethernet port is used to download executable files. The serial port is used for commands and status. Again, please refer to the PSW section for details.

3.4.3. tty Mode

When the controller has completed booting a login line will be displayed. This mode is a typical tty window, and is password protected. This password changes with each major software release. The password is stored on the controller hard disk in an encrypted format similarly to how UNIX encrypts and stores passwords. Through this port a user can gain information and access to any files or information stored in the controller DRAM or controller hard disk. However, this mode is only used by a CSE if directed by a Field Engineer when all other diagnostics fail to solve a problem. The written repair procedures that direct the CSE never employ this mode.

3.4.4. Diagnostics via Portable Service Workstation (PSW) Port

When connected to the PSW Port, the PSW provides an extensive suite of diagnostic functions for use by the Xerox Customer Service Engineer (CSE). The over-the-wire protocol is Xerox proprietary. This port cannot process any other protocol except this proprietary protocol used for machine diagnosis. Also, the PSW must have an application loaded to connect to and communicate with the device.

Customer documents or files cannot be accessed during a diagnostic session, nor are network servers accessible through this port.

Ver. 2.00, March 2011 Page 27 of 50