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HP 33440/HP
33449 COMBINED
SERVICE
MANUAL
Skew Tolerance
Ml vertid
lines should be parallel to the left edge of the paper. In Figure 7-31, dimension A
should not vary from dimension B by more than 1.5mm (0.06 in.) over a paper length of 260mm
(10.25 inches).
Procedure
Run the printer Control Panel continuous Self Test (04 SELFTEST).
E misre@stration is suspected, measure the lefi and top margins and compare the measured values
with the listed specifications. If, in comparison, misregistration is confirmed, proceed as follows:
1. Closely examine the paper path gear train. Inspect for worn or excessively dl~
gears. Replace
or clean if necessary.
2. Inspect the Paper Pickup Roller. If worn, replace the Feed Roller Assembly and Separation Pad.
3.
Verify that the torsion springs are correctiy mounted on the Registration Assembly.
4.
If the preceding actions do not correct the misregistration problem, replace the Registration
Assembly.
Note
There are no adjustments for skew or registration problems.
Fusing Check
The Fusing Assembly permanently bonds toner to the paper. To verify that the printer is correctiy
fusing the print image, proceed as follows:
1. Run ten continuous copies of the Control Panel Self Test.
2.
Place the printout on a firm surface and, using your fingertips, vigorously rub the first and the
tenth printout. Inspect for any evidence of smearing. The M
should be permanently fused on
both printiuts. No smearing should occur.
If the level of fusing from the first printout varies from that of the tenth printout, clean the Fusing
Assembly's Thermistor and repeat the fusing check. If the difference in levels of fusing persists,
replace the Thermistor/Exit Sensor PCA.
If smearing occurs in dl printouts, replace the Fusing Assembly.
If the problem continues, replace the DC Controller PCA.
Note
E the Thermistor Bypass Switch is not engaged when the Bottom Cover is in
cl
v
place, the DC Controller betieves the fuser is at temperature and, therefore, the
fusing lamp will not be activated. However, the printer win attempt to print
"normally" in this condition.
7-83
Capítulos
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