HP 4300 Service Manual - Page 271
Printer resets and poweron modes, Cold reset, To perform a cold reset, NVRAM initialization
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Printer resets and power-on modes Note CAUTION Note Q2431-90912 Cold reset A cold reset unlocks menus that have been previously locked and sets all control panel menu items (including EIO settings) back to the factory defaults. However, it does not clear the values in the service menu (such as the serial number and page counts). Before performing a cold reset, print a menu map and a configuration page (see "Menu map" on page 240 and "Configuration page" on page 241). Use the information on the configuration page to reset any customer-set printer configuration values that the cold reset procedure changes. To perform a cold reset 1. Turn the printer power off. 2. Hold down the SELECT ( ) button, and then turn the printer power on. Continue holding down the SELECT ( ) button until all three printer control-panel lights flash once and then remain on. This might take up to 10 seconds. 3. After the message SELECT LANGUAGE appears on the display, press the UP ARROW ( ) button or the DOWN ARROW ( ) button until COLD RESET is highlighted. 4. Press the SELECT ( ) button. The printer performs a cold reset and then continues its power-on sequence. 5. Check all I/O settings and reset any customer-set printer configuration values. NVRAM initialization Initializing the NVRAM resets the serial number, the event log, the page counts, and the EIO card (Initializing the NVRAM will reset service menu values to factory defaults). Use the service menu to restore the serial number and page counts. Also reconfigure any computers that print to this printer so that the computers can recognize the printer. Initialize the NVRAM only when absolutely necessary. In most situations, use a cold reset rather than a NVRAM initialization to reset printer settings (this will retain the values in the service menu). Before performing a NVRAM initialization, print a menu map and a configuration page (see "Menu map" on page 240 and "Configuration page" on page 241). Use the information on the configuration page to reset any customer-set printer configuration values that the NVRAM initialization procedure changes. Take special note of the total page count, maintenance count, and the serial number. To initialize NVRAM 1. Remove any installed accessories (for example, a stapler/stacker). 2. Turn the printer power off. 3. Hold down the DOWN ARROW ( ) button, and then turn the printer power on. Continue holding down the DOWN ARROW ( ) button until all three printer control panel lights flash once and then remain on. This might take up to 10 seconds. 4. Press the UP ARROW ( ) button. 5. Press the PAUSE/RESUME button. The display should show SKIP DISK LOAD. 6. Press the UP ARROW ( ) button until NVRAM INIT is highlighted. 7. Press the SELECT ( ) button. The printer initializes NVRAM and then continues its power-on sequence. Chapter 7 Troubleshooting 251