HP LaserJet II Serie Manual De Instrucciones página 230

HP 33440/HP 33449 COMBINED. SERVICE MANUAL
Table 7-35. Black Pages with Horizontal White Stripes
1. Defective
(damaged) Fiber
Optic Cable.
2.
Laser/Scanning
Assembly or DC
Controller PCA.
1. Worn Feed Roller
Assembly.
3. Registration
4ssembly torsion
;prings.
This unique printout results from a
defective or damaged Fiber Optic Cable.
The pattern results from the printer's
firmware attempting to locate Beam
Detect (the horizonti synchronization
signal). The white horizonti lines
result from retry efforts by the
firmware (e.g., the turning on/off of the
laser) in an attempt to locate Beam
Detect. The black areas show where
the laser is continuously on, discharging
the surface of the drum. This printout
is usually associated with a 51 ERROR.
See explanation in step 1 above.
Table 7-36. Image Skew
H paper is carelessly instiled in
the paper tray or the paper tray is
loosely instiled in the printer, paper
movement will be hindered as the
paper enters the Registration Assembly.
If the Paper Pickup Roller or associated
clutch is sufficiently worn, the leading
edge of the paper may be skewed before
it reaches the Registration Rollers.
The Registration Assembly torsion
springs ensure that equal pressure is
applied to both ends of the upper and
lower Registration Rollers. If one of
the springs is missing or defective,
unequal pressure would be applied to
the paper along the length of the roller.
The paper should advance through the
assembIy in a uniform manner. Since
one side of the paper advances ahead of
the other side of the paper, the image
would appear skewed on the paper.
Insure the Fiber Optic Cable
s properly seated. If the error
)ersista, replace the Fiber Optic
~able.
Replace the Laser/Scanning
Assembly followed by the DC
Controller PCA, if necessary.
Inspect the paper tray. Verify
that the tray is correctiy loaded
and not overfilled. Verify
that the tab in the upper left
corner of the tray is not bent
out of position. Veri& that the
paper tray is fully seated into
the printer. Switch trays with
another printer to ver~ that
the problem follows the tray.
Replace the Feed Roller
Assembly.
Inspect the Registration
Assembly's torsion springs to
verify correct instigation. If
the springs are out of position,
reinstil. If correctiy installed
but the image is still skewing
beyond its specification, replace
the Registration Assembly. If
the fault condition persists,
refer to the "Registration
ChecV' toward the end of this
section.
7-66