Possible Cause - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
POSS~LE CAUSE
1. Defective or
mproperly seated
?iber Optic Cable.
1. Laser/Scanning
lssembly.
3.
DC Controller
PCA.
Table 7-29. Random Horizontal Black Lines
Horizonti black lines could occur in the event
of a beam detect error (41 ERROR). In this
condition (i.e., the microprocessor is expecting
beam detecb but never receives it), the processor
turns on the laser continuously, searching for
beam detect. If beam detect has not occurred
after NO seconds, a 51 ERROR message is
displayed on the Control Panel. If the Fiber
Optic Cable is damaged or disconnected, the
beam would be blocked from the microprocessor
and an error would result.
If the beam detect mirror within the assembly
becomes misaligned or damaged, beam detect
would not consistently be provided to the DC
Controller PCA,
See previous explanations.
Table 7-30. Slightly Faint Print
POSSIBLE CAUSE :---- '-.': ,. . *"- =: ." -" -, ,.:
,.-
1. EP-S Cartridge.
No toner available for print.
2. Print Density set The higher the Print Density Did
,mproperly.
setting, the sma31erthe amount of toner
that will be transferred to the EP drum.
3. Drum Sensitivity The drum sensitivi~ switches sense the
Switches.
drum's sensitivi~ to three levels of laser
light. Malfunctioning microswitches may
cause the microprocessor to adjusting
the laser power level incorrectly with
respect to EP-S Cartridge requirements.
~. Erase Lamp Slightiy faint print may result over time
Assembly.
if the erase lamps are malfunctioning.
j. Low laser power.
Low laser power would result in an
inadequately discharged surface on the
photoconductive drum.
5. Paper.
The paper may not be acceptable to the
electrophotographic processes.
I
7. Transfer Corona. Corona functiondi~ may not be at peak.
AC~ON
3eplace the Fiber
3ptic Cable.
Replace the
Laser/Smnning
Assembly.
Replace the DC
~ontroller PCA.
Replace the EP-S Cartltidge.
Turn the Print Density Dial
to a lower setting (i.e., toward
"l"). Replace the ~S if no
effect.
Perform the "Drum Sensitivity
Switches (SW301 and SW302)
Functiona3 Check" in Section
7-4.
Perform the "Erase Lamp
Functiona3 Check" following.
Verify the laser power output.
Refer to "Laser Power
Verification" in Section 7-4.
Try
a
known source and type
of paper. Refer to the Paper
Specifications Guide or to
Chapter 2, Section 2-4.
Clean the Corona Assembly. -
7-63