Functional checks 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 horizontal 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 is inside the left side door, below the formatter. To print an engine test, open the left side door and, using a non- conductive probe, depress the engine test switch. A single test page will print. CAUTION Use a non-conductive probe to depress the engine test switch.
Inserting a conductive probe to depress the switch can damage the product. Note The formatter must be connected to the ECU to perform an engine test. (See callout 1 in figure 86 on page 165.) Otherwise, the printer does not print. You must override the print cartridge door interlock (SW 301). (See “Paper path check” on page 206.) 2 1 Figure 94. Engine test switch 200 Chapter 6 - Troubleshooting EN