HP C7769B Service Manual - Page 23

Troubleshooting Initializing various components of the Main PCA. Initializing a portion of the Firmware. Initializing the I/O. Initializing the User Interface (Front Panel menus). Initializing a portion of the Firmware. Initializing the Formatter. Initializing the communication between Main PCA and Formatter. End of initialization sequence. Entering Service Menu at Power Up - Only for Onsite Repair If the Printer fails to initialize completely because of a System Error and you need to use the Service Menu (Service Tests and Utilities), the Printer can be powered up in Service Mode by pressing the Up and Enter keys while switching the Printer ON. This will give you access to some of the Service Tests and Utilities without having to complete the System Initialization (if you perform some of the tests, they will need to initialize the relevant part of the System). HP DesignJets 500 and 800 Series Printers Service Manual 1-13