Identification Model and serial numbers The model and serial numbers are listed on identification labels that are located inside the top cover. The serial number is alphanumeric, such as USB0000146 for the HP LaserJet 5100 series printer. The serial number contains information about the origin location, as well as the revision level, the production code, and the production number of the printer. The labels also contain power rating and regulatory information as shown in figure 1. Figure 1. Sample identification labels Q1860-90918 Chapter 1 Printer description 19