HP LaserJet 3200 Service Manual - Page 167

Functional checks Note Engine test The engine test is used to verify that the print engine is functioning correctly. The formatter is bypassed during an engine test, so the engine test is useful for isolating printer problems. The engine test prints vertical lines down the entire printable area of a page and is also useful for checking and adjusting registration. Printing an engine test The engine test switch can be reached without removing the covers. It is located on the back of the product under the memory door. To print an engine test, lift the memory door on the back of the printer and depress the engine test switch. A single test page will print. The formatter must be connected to the ECU to perform an engine test (see callouts 1, 2, and 3 in figure 64 on page 137). If it is not, the product prints a black page. Figure 71. Engine test switch EN Functional checks 165