Troubleshooting
Engine Test
Engine Test
a
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 testis therefore very useful for
isolating printer problems. The engine test prints a full page of
vertical lines down the entire printable area, and is thus also
o
useful for checking and adjusting registration.
Engine Test Button Location
The engine test print button(SW301) is located on the side of the
DC Controller PCA (see Figure 7-2). It is accessible through a hole
in the Gear Train plate.
Printing an Engine Test - LaserJet 4L/4ML
On the LaserJet 4L/4ML, the engine test button is accessible
without removing the covers, through the I/O Door area on the
left side of the printer. To print an engine test, use a long object
(such as a pencil) to press the engine test button (see Figure 7-4).
(Do not
usea metal object.) A single test page is printed.
.
gure
7-4
Engine Test Button and Printout, LaserJet 4L/4ML
7-36
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