HP 8000dn Service Manual - Page 359

Note Engine Test The engine test verifies that the print engine is functioning correctly. This test is very useful for isolating printer problems since the Formatter PCA is completely bypassed during an engine test. This test is very useful for isolating printer problems. The engine test prints a full page of horizontal lines across the entire printable area and is also useful for checking and adjusting registration. The engine test prints from Tray 3 only and can be activated with the Formatter PCA removed. Tray 3 must be installed and loaded with paper to perform an engine test. Also, make sure that the EP toner cartridge is installed in the printer. Engine Test Button Location The engine test button is located on the DC Controller PCA. It is accessible through a hole at the right rear of the printer. Printing an Engine Test To print an engine test, use a non-metallic object (such as a pencil) to press the engine test button (see figure 7-4). A single test page will print. Figure 7-4 Engine Test Button EN Power On 335