HP 1320 Service Manual - Page 194
Functional checks, Engine test, Printing an engine test
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Functional checks NOTE NOTE This section includes five functional checks for troubleshooting. 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 formatter must be connected to the ECU to perform an engine test. The engine-test switch is inside the left cover, below the formatter. To print an engine test, remove the left side cover (see Left-side cover), override the door interlock (SW 301), and then press the engine-test switch (callout 1 in Figure 7-1. Location of engine-test switch). A single test page prints. Printing a configuration page verifies that the formatter is working correctly. Figure 7-1. Location of engine-test switch 182 Chapter 7 Troubleshooting ENWW