HP M5025 Service Manual - Page 540

Restoring the service ID In the unlikely event that the service ID is lost, use this menu item to reset the value to the date that the device was first used. The date format is YYDDD. Use the following procedure to calculate the date. 1. To calculate YY, subtract 1990 from the calendar year. For instance, if the device was first used in 2002, calculate YY as follows: 2002 - 1990 = 12 (YY = 12). 2. To calculate DDD, use the following formula: 30 (calendar month - 1) + calendar day = DDD. If the calendar day is 31, use 30 instead. For instance, if the printer was first used on October 17, calculate DDD as follows: a. Subtract 1 from 10 (October is the tenth month of the year): 10 - 1 = 9. b. Multiply 9 by 30: 9 x 30 = 270. c. Add 17 to 270: 270 + 17 = 287 (DDD = 287). Convert the service ID to an actual date You can use the device service ID number to determine whether the device is still under warranty. Use the following procedure to convert the service ID into the installation date. 1. Add 1990 to YY to determine the actual year that the device was installed. 2. Divide DDD by 30 and add 1 to the quotient. The total is the month. 3. The remainder from the calculation in step 2 is the day of the month. Using the Service ID 12287 as an example, the date conversion is as follows: ● 12 + 1990 = 2002, so the year is 2002. ● 287 divided by 30 = 9 with a remainder of 17. Add 1 to 9 to get 10 so the month is October. ● The remainder (from the calculation above) is 17, so that is the day of the month. ● The complete date is 17-October-2002. A six-day grace period is built into the date system. 510 Chapter 6 Troubleshooting ENWW