HP LaserJet 4v/mv Service Manual - Page 167

Troubleshooting Checks

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7 Troubleshooting 7ENGTST Figure 7-2 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. This test is very useful for isolating printer problems. The engine test prints a full page of horizontal lines down the entire printable area, and is also useful for checking and adjusting registration. Engine Test Button Location The engine test print button (SW7001) is located on the DC Controller PCA. It is accessible through a hole at the rear of the printer. Printing an Engine Test To print an engine test, use a non-metallic object to press the engine test button (see Figure 7-2). A single test page is printed. Engine Test Printout Engine Test Button and Printout Troubleshooting 7-31

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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.
This test is very useful for isolating printer problems.
The engine test
prints a full page of horizontal lines down the entire printable area, and is
also useful for checking and adjusting registration.
Engine Test Button Location
The engine test print button (SW7001) is located on the DC Controller PCA.
It is accessible through a hole at the rear of the printer.
Printing an Engine Test
To print an engine test, use a non-metallic object to press the engine test
button (see Figure 7-2).
A single test page is printed.
Engine Test Button and Printout
Engine Test Printout
7ENGTST
Figure 7-2
7
Troubleshooting
Troubleshooting 7-31