HP LaserJet 6p/mp Service Manual - Page 135

Troubleshooting checks, Engine test

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Troubleshooting checks Engine test The engine test print is used to verify that the print engine is functioning correctly. The Formatter PCA is completely bypassed during an engine test, so this test is useful for isolating printer problems. The engine test prints a full page of vertical lines down the entire printable area and is also useful for checking and adjusting registration. Engine Test Button location The engine test print button is located on the DC Controller PCA. It is accessible through a hole at the front of the printer. (See Figure 7-4.) Printing an engine test The engine test button is accessible without removing the covers. To print an engine test, use a long, non-metallic object (such as a pen or pencil) to press the engine test button. A single test page is printed. (See Figure 7-4.) Engine test printout Engine test printout Engine test button (5L/6L) (6L Pro) Figure 7-4 Engine test EN Troubleshooting checks 133

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EN
Troubleshooting checks
133
Troubleshooting checks
Engine test
The engine test print is used to verify that the print engine is functioning correctly. The Formatter
PCA is completely bypassed during an engine test, so this test is useful for isolating printer problems.
The engine test prints a full page of vertical lines down the entire printable area and is also useful for
checking and adjusting registration.
Engine Test Button location
The engine test print button is located on the DC Controller PCA. It is accessible through a hole at
the front of the printer. (See Figure 7-4.)
Printing an engine test
The engine test button is accessible without removing the covers. To print an engine test, use a long,
non-metallic object (such as a pen or pencil) to press the engine test button. A single test page is
printed. (See Figure 7-4.)
Figure
7-4
Engine test
Engine test button
Engine test printout
(6L Pro)
Engine test printout
(5L/6L)