HP Color LaserJet CM4730 Service Manual - Page 637
Functional checks, Engine test, Formatter test,
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Functional checks Use the following procedures to help diagnose and solve problems that occur in the print engine. Engine test To verify that the print engine (all components except the formatter, formatter DIMMs, EIO products, and the stacker or stapler/stacker) is functioning, print an engine test page. Use a small, nonmetallic, pointed object to depress the engine-test switch, which is located on the back of the MFP. NOTE: The standard output bin must be installed in order for the engine-test page to print. If either the stapler/stacker or the 3-bin mailbox is installed, a jam occurs. Figure 6-2 Engine test print switch The test page should have a series of vertical lines. The test page prints from the last tray that you used. However, if the MFP has been turned off and then on since the most recent print job, the page prints from tray 2. The MFP continuously prints test pages as long as the test-page switch is depressed. The MFP cannot print a test page if it is in Sleep mode. NOTE: A damaged formatter might interfere with the engine test. If the engine-test page does not print, try removing the formatter and performing the engine test again. If the engine test is then successful, the problem is almost certainly with the formatter, the control panel, or the cable that connects them. Formatter test To verify that the formatter is functioning correctly, print a configuration page. If the page prints, the formatter is functioning. ENWW Functional checks 617
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