HP C7769B Service Manual - Page 22
Using the Boot-Up Sequence to Troubleshoot, When you Power On the Printer
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Troubleshooting Using the Boot-Up Sequence to Troubleshoot When you Power On the Printer, the Printer performs the Boot-Up sequence which initializes the major components of the Printer. If for some reason the Boot-Up sequence fails because a component has failed to initialize, the following explanations will help you to locate the failing component: During the first phase of the Boot-up sequence (all the squares turn grey) the Printer is initializing the Operating System. If for some reason this sequence fails, try the following: 1 Switch the Printer Off and wait a few minutes. Switch the Printer On again and check if the initialization sequence is successful. 2 If the initialization sequence fails again, replace the Electronics Module ⇒ Page 8-24. During the second phase of the Boot-up sequence (all the squares turn black) the Printer is initializing various components (too numerous to mention). In normal circumstances, if a component fails during this sequence a System Error will appear and you should refer to Chapter 2 - System Error Codes. The following information explains what is being initialized as each square turns black: Initializing various components of the Main PCA. Initializing various components of the Main PCA. Initializing a portion of the Firmware. Initializing various components of the Main PCA. 1-12 HP DesignJets 500 and 800 Series Printers Service Manual