HP 4550 Service Manual - Page 298

Description of Service Menu items The following menu items should be used by trained service personnel only. These items are used to ensure the printer functions properly. Serial number The serial number displayed on the front panel should match the serial number tag located on the rear of the printer, as this is the serial number printed on the configuration page. Setting the serial number: 1 Press the [ITEM] key until SERIAL NUMBER = (number) appears. 2 Press the [VALUE +/-] key to change the character with the cursor under it. 3 Press [SELECT] to save the character and move the cursor to the next slot. 4 Repeat steps 2 and 3 until all the characters match the label on the back of the printer. Transfer maintenance count There are two methods to track the life of the intermediate transfer belt (ITB):
The life lever on the ITB actually indicates when the ITB has reached its end of life.
The transfer maintenance count (printed on the configuration page) shows the percent of life used. This number is not critical to printer operation, but it provides a way for customers to monitor consumable life. The transfer maintenance count is set to zero when the life message for the ITB is reset. If you replace the ITB before the end of life message appears, you also need to set this value to zero. Setting transfer maintenance count 1 Press the [ITEM] key until transfer maintenance count appears. 2 Press the [VALUE +/-] key to set the number. 3 Press [SELECT] to save. 4 Repeat steps 2 and 3 to change the other numbers if required. Fuser maintenance count The fuser maintenance count functions the same way as other HP LaserJet printers. This count is the actual life of the fusing unit and is used to indicate its end of life. If the fuser is replaced before the end of life message appears, the fuser count must be reset to zero. An actual end of life condition will have a reset to clear the end of life message and set the fuser count to zero. Setting fuser maintenance count: 1 Press the [ITEM] key until FUSER MAINTENANCE COUNT appears. 2 Press the [VALUE +/-] key to set the number. 3 Press [SELECT] to save. 4 Repeat steps 2 and 3 to change the other numbers if required. Color page count Color page count is used to track the number of pages printed with any color other than black. Although this count is not critical, there might be customers who use it to track the number of color documents printed. If the number needs to be reentered, select a number which is as close as possible to the original. An earlier configuration page is a great source if one can be found. Setting color page count: 1 Press the [ITEM] key until COLOR PAGE COUNT appears. 296 Troubleshooting C7085-90921