HP 3380 Service Manual - Page 224
Functional checks, Engine test, Control-panel check
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Functional checks Use the following procedures to help diagnose and solve problems that occur in the print engine. CAUTION 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 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 use a non-conductive probe to depress the engine test switch. A single test page will print. Use a non-conductive probe to depress the engine test switch. Inserting a conductive probe to depress the switch can damage the product. The formatter must be connected to the ECU in order to perform an engine test. Otherwise, the printer does not print. You must override the print cartridge door interlock (SW 301). (See Paper-path check.) 1 Figure 6-2. Engine test switch Control-panel check Perform the control-panel check to verify that all the control-panel buttons and LEDs are functioning. If any control-panel button or LED is not functioning, replace the control panel. 208 Chapter 6 Troubleshooting ENWW