HP Laserjet 5 Service Manual

Service and Error Messages
Service errors prevent further printer operation until some action is taken. When
there is a service error, all of the lights will turn on in a steady state.Press and hold
theFront Panel Buttonto see a pattern in the lights. (The error will only be
displayed as long as this button is pressed.) Use Table 7-4, “Service and Error
Messages,” to identify what type of service error has occurred.
LEDs Description Recommended Action
ROM/RAM Error. An error was found with
the ROM or...

Heating Element Resistance Check
Figure 7-3
LEDs Description Recommended Action
Beam Error. There are a number of causes
for this error, and some of the causes may
be transient. (They may disappear.)1. Power-cycle the printer by unplugging the printer
and plugging it back in.
2. Make certain the Laser/Scanner Assembly is
correctly seated on the printer chassis.
3. Replace the Laser/Scanner cable (J208 on the DC
Controller).
4. Replace the Laser/Scanner Assembly.
5. Replace the DC Controller PCA.
Engine...

LEDs Description Recommended Action
Scanner Error. Caused by a scanner
malfunction.1. Power-cycle the printer by unplugging the printer
and plugging it back in.
2. Ensure condensation caused by moving the printer
from a cold to a warm environment hasn’t occurred.
Allow the printer to acclimate to the warmer room.
3. Verify the two Laser/Scanner Assembly connectors
are firmly seated.
4. Replace scanner cable J207 on the DC Controller
PCA.
5. Replace the Laser/Scanner Assembly.
6. Replace the DC Controller...

Image Formation Troubleshooting
Check the Toner Cartridge
Image formation defects are many times the result of toner cartridge problems. If
there is any doubt, always replace the toner cartridge before troubleshooting image
defects.
Use the following check list to ensure that the toner cartridge is still operable.
·Ensure that the toner cartridge is seated properly in the cavity.
·Inspect the toner cartridge for remaining toner.
·Check the expiration date of the toner cartridge (stamped on the cartridge...

Image Defect Examples
This section illustrates some image defects and their possible causes. Since there are
many variables in the printing process, you may encounter image defects that are
not illustrated in the following examples. If you find a defect that is not illustrated,
record the probable cause along with the printing environmental conditions and save
a copy of the defect for future reference.
Each example lists, in order, the probable causes of the image defect.
Faded Print
Faded or light print...

Vertical Lines
Sometimes vertically aligned black streaks or smears can appear on successive
pages.
·The toner cartridge may be damaged. Replace it.
·The printer may need cleaning. See “Cleaning Your Printer,” in Chapter 4.
·Replace the heating element.
Horizontal Stripes
Sometimes horizontally aligned black streaks or smears can appear.
·The toner cartridge may not be installed properly. Remove the cartridge and
reinsert it.
·The toner cartridge may be defective. Replace it.
·If the printer still has...

Character Voids
Character voids are white areas within the parts of characters that should be solid
black.
·If you are using transparencies when you experience this problem, try another
type of transparency. Hewlett-Packard transparencies are designed to minimize
character voids. (Because of the composition of transparency media, some
character voids are normal.)
·You may be printing on the wrong side of the paper. Remove the paper and turn it
over. (The label on many reams of paper has an arrow...

Dropouts
Dropouts are characters that are partially printed.
·The Paper Input Bin may have been loaded with too much paper. Make sure that
no more than 100 sheets of paper are loaded.
·A single sheet of paper may be defective. Try reprinting the job.
·Try adjusting the print density through your software or printer driver.
·Try cleaning the rollers.
·The moisture content of the paper may be inconsistent, or the paper may have
moist or wet spots on the surface. Try paper from a fresh ream or a different...

Blank Page (Occasional)
A page is completely blank. If you getoccasionalblank pages:
·Make sure your page length and margins are set correctly for the paper size you
use. If you are printing on small media and your page is blank, try printing on
larger media to see where the image is printing. Adjust margins accordingly.
·Some sharing devices or networks may generate a blank page as a separator. Try
connecting the printer directly to the computer.
·Your printer may be feeding two or more pages at once...

Dots
·Clean the static charge eliminator. (See Chapter 4, “Printer Maintenance.)
·There may be discontinuities in the high-voltage contact points. Clean the high
voltage contact points on the toner cartridge and transfer roller.
·Replace the transfer roller.
Dirt on the Back of the Page
·Use the image defect ruler to determine if the rollers are dirty. If so, clean them.
Replace the rollers if they cannot be cleaned sufficiently.
·Clean the heating element.
Blank Spots
·The paper may not meet HP’s paper...