HP 5100 Service Manual - Page 192

Note Engine test The engine test verifies that the print engine is functioning correctly. The formatter is bypassed during an engine test, but it can still interfere with the test. The engine test is very useful for isolating printer problems. Because the engine test prints a full page of lines across the entire printable area, it is also useful for checking and adjusting registration. Make sure that the toner cartridge is installed in the printer before you perform an engine test. The engine test prints either from Tray 2 (the default), or from the last tray used, and can be activated with the formatter removed. If the last tray that was used is empty or if the last source was the duplexer, then the engine test will print from Tray 2. If Tray 2 is empty, and the last tray that was used is empty, or if the last page went through the duplexer, or if the printer is in PowerSave mode, then the engine test will not function. Engine test button location 12 Figure 122. Location of the engine test button (callout 1) Printing an engine test To print an engine test, use a nonmetallic object of 40 mm (1.5 inches) minimum length to press the engine test button. A single test page with horizontal lines prints. To print multiple test pages, hold down the engine test button. Display The control panel should show READY, OFFLINE, or POWERSAVE ON when the printer is on and idle. For information about error messages, see "Printer messages" on page 193, or see the event log. If the display is blank, see "Preliminary operating checks" on page 187. 190 Troubleshooting Q1860-90918