HP 2100 Service Manual - Page 59

Service Mode In Service Mode the following can be preformed: • Print a Service Mode Self-Test. • Verify and set the page count. See "Setting the Page Count" (page 51) for information. • Set the Cold Reset Default. See "Setting the Cold Reset Default" (page 51) for information. • Set the Demo Page=True/False Used to remove the demo page from the service mode self-test. • Set the Diagnostic Functions On or Off. For software developers use only. Accessing Service Mode Use PJL commands to enter service mode and perform various service mode configurations. Many printer commands use the lowercase letter l (l) and the number one (1), or the uppercase letter O (O) and the number zero (0). These characters may not appear on the screen as shown here. Users must use the exact character and case specified for PCL printer commands. The following are elements of a typical printer command: • Escape character (begins escape sequence) • Parameterized character • Group character • Value field (contains both alpha and numeric characters) • Termination character (uppercase) Escape sequences may be combined into one escape sequence string. There are three important rules to follow when combining code: 1 The first two characters after the EC character (the parameterized and group characters) must be the same in all of the commands to be combined. 2 When combining escape sequences, change the uppercase (termination) character in each individual escape sequence to lowercase. 3 The final character of the combined escape sequence must be uppercase. C4170-90959 Service Mode 49