HP LaserJet II Serie Manual De Instrucciones página 229

2. Laser/Scanning
Assembly.
3. Laser/Scanning
Oable Assembly.
1. High-Voltage
Zorona stays on.
HP 33440/HP 33449 COMBINED SERVICE MANUAL
Table 7-33. Distorted Print
If any component within the paper
path is preventing the paper from
moving at a uniform rate, the print
image would be affected (e.g., the main
motor rotating too fast or too slow, the
transport gears excessively worn, etc.).
Characters that are either too Ml or too
short (in the direction of paper motion)
are usually a result of drive mechanism
problem.
Wavy, irregular-shaped characters,
or irregular line margins in the scan
direction of printing are usually a result
of a defective Laser/Scanning Assembly.
See explanation above.
Improper charges on the EP drum
surface u muse image distortion.
Table 7-34. Repetitive Defects
1. EP-S Cartridge. The circumference of the
photoconductive drum (EP drum)
is 32 inches. The circumference of
the developer roller is 2 inches. If a
defect appears in the print image at
these intervals, assume the defect is
associated with the EP-S Catiridge.
2.
Fusing Assembly.
3. Dirty Roller.
4.
Bad High-Voltige
Power Supply
Assembly or DC
Controller.
The Fusing Roller's circumference is
approximately 3* inches. If a defect
appears at this interval, assume the
defect is associated with the Fusing
Assembly.
Any dirty roller along the paper path
may result in a pattern of repetitive
print image defects.
A "sofi" HVPS may leave inadequate
charges on the EP drum or may not
properly charge the developer roller.
If the Primary or Transfer Coronas
are lefi on when the printer is idle,
repetitive image defecti will appear.
Closely examine the paper
transpofi rollers along the
paper path for wear. Replace
if excessive wear is observed.
Inspect and replace the
EP-S Cartridge, Feed Drive
Assembly, 19- and 57-Tooth
Gears, Main Motor and Drive
Assembly, or Fusing Assembly
as necessary.
Replace the Laser/Scanning
Assembly.
Replace the Cable Assembly.
See Table 7-45, "High-Voltage
System Checks."
Replace the EP-S Catiridge.
Refer to the "Repetitive Image
Defect Ruler" drawing in
Section 7-7 for additional hints.
Clean the Fusing Assembly
rollers. Replace the assembly if
necessary.
Examine and clean rollers
along the paper path. Refer
to "Repetitive Image Defect
Ruler" drawing in Section 7-7.
Replace the ~S. If the
problem persists, replace the
DC Controller.
7-65