Image defects. HP 3600, 3600 n, CP3505 dtn, 3000, 3000 dtn, 3600 dn, 3600 dtn, 3800 n, 3800 dn, 3800 dtn
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Image defects
If specific defects occur repeatedly, print a Print Quality Troubleshooting page and follow the instructions on the first page. If you cannot resolve the problem, use the information in this section to identify the root cause of the problem.
Image defects fall into the following categories. Links to possible causes and recommended solutions are included. In general, the items are listed in order, from minor repairs to major repairs. Check each item in the order in which it appears.
NOTE: Verify that all firmware has been upgraded to the latest version.
Table 6-3 Image defects
Image defect
Light image
Light color
Dark image
Dark color
Completely blank
All black/solid color
Dots in vertical lines
Dirt on back of paper
Dirt on front of paper
Vertical lines
White vertical lines
Horizontal lines
White horizontal lines
Missing color
Description More information
Image light in all colors
Image light in a particular color
Image dark in all colors
Image dark in a particular color
No image prints
See Table 6-4 Causes for light images on page 216 .
See Table 6-5 Causes for one color printing light on page 217
.
See Table 6-6 Causes for dark images on page 217 .
See Table 6-7 Causes for one color printing darker than others on page 218 .
See Table 6-8 Causes for a completely blank image on page 218 .
Image is all black or solid color
White dots appear in image
Dirt on the back of the page
Dirt on the front of the page
Vertical line appears in image
White vertical line appears in image
See Table 6-10 Causes for vertical lines of white dots on page 218
.
See Table 6-11 Causes for dirt on the back of the paper on page 219 .
See Table 6-12 Causes for dirt on the front of the paper on page 219 .
See Table 6-13 Causes for vertical lines on page 220 .
See Table 6-14 Causes for white vertical lines on page 220 .
Horizontal line appears in image
White horizontal line appears in image
Image in a particular color does not come out in color
See Table 6-15 Causes for horizontal line on page 220
.
See Table 6-16 Causes for white horizontal lines on page 221
.
See Table 6-17 Causes for a missing color on page 221
.
ENWW Image defects 215
Table 6-3 Image defects (continued)
Image defect
Blank spots
Poor fusing
Distorted Image
Color misregistration
Smearing
Misplaced image
Reversed color
Snail tracks
Description
Blank spots appear in image
Toner image is not fully fixed on the media
Image is distorted
Some color is misregistered
Image smeared in whole or in part
Whole image is incorrectly placed
White in image is output in color, and color is output in white
Streaks on the page (that look like snail tracks); the media might wrinkle
More information
See Table 6-18 Causes for blank spots on page 222 .
See Table 6-19 Causes for poor fusing on page 222 .
See Table 6-19 Causes for poor fusing on page 222 .
See Table 6-21 Causes for color misregistration on page 223 .
See Table 6-22 Causes for smearing on page 223 .
See Table 6-23 Causes for a misplaced image on page 224 .
See Table 6-24 Causes for reversed color on page 224
.
See Table 6-25 Causes for snail tracks on page 224 .
Light image
Table 6-4 Causes for light images
Cause
The image density is not adjusted correctly
The transfer unit has deteriorated
Poor secondary-transfer-bias contacts exist
Solution
Calibrate the printer.
If the transfer unit is at the end of its life or its surface has deteriorated, replace the transfer unit.
NOTE: A large white streak appearing slightly off-center of the transfer unit is not a defect. The transfer unit does not need to be replaced in this case.
On the secondary transfer roller, check the bias contacts to the high-voltage PCB. Clean them, if necessary.
Replace defective parts and deformed or damaged contacts.
Replace the secondary transfer charging roller.
The secondary transfer charging roller is deformed or has deteriorated
The high-voltage PCB is defective
The DC controller PCB is defective
Contamination buildup on the scanner mirror or lenses
Replace the high-voltage PCB.
Replace the DC controller PCB.
Replace the scanner assembly.
Light color
Use an external device to print a solid-filled image as an example of the problem. As the sample prints, turn the printer off and remove the cartridge. Open the cartridge shutter. If the toner image on
216 Chapter 6 Troubleshooting ENWW
the drum before transfer is light for more than one color, go to step A. If the toner image on the photosensitive drum is not fully transferring to the transfer unit, go to step B in the following table.
Table 6-5 Causes for one color printing light
Cause Solution
Step A Poor developing-bias contacts Check the developing-bias contacts to the high-voltage
PCB. Clean the contacts as necessary. Replace any deformed or damaged contacts.
Replace the scanner assembly.
Step B
Contamination buildup on the scanner mirror or lenses
Deteriorated cartridge (photosensitive drum)
Defective high-voltage PCB
Defective DC controller PCB
Poor primary-transfer-bias contacts
Replace the cartridge that produces the light color.
Replace the high-voltage PCB.
Replace the DC controller PCB.
On the transfer unit, check the primary transfer-bias-contacts to the high-voltage PCB. Clean the contacts as necessary. Replace any deformed or damaged contacts.
Replace the transfer unit.
Deformed or deteriorated primary-transfer charging roller
Defective high-voltage PCB
Defective laser/scanner unit
Defective DC controller PCB
Replace the high-voltage PCB.
Replace the laser/scanner unit.
Replace the DC controller PCB.
Dark image
Table 6-6 Causes for dark images
Cause
Image density is not adjusted correctly
Color misregistration sensor lens is dirty
Color misregistration sensor is defective
Environmental sensor is defective
DC controller PCB is defective
Solution
Calibrate the printer.
Clean the color misregistration sensor lens.
Replace the color misregistration sensor.
Replace the environmental sensor.
Replace the DC controller PCB.
ENWW Image defects 217
Dark color
Table 6-7 Causes for one color printing darker than others
Cause Solution
Poor contacts with the primary-charging bias, developing bias, or drum grounding
High-voltage PCB is defective
DC controller PCB is defective
On the cartridge that is producing the darker color, check the primary-charging bias and developing-bias contacts to the high-voltage PCB, or the drum-grounding contacts. Clean the contacts as necessary. Replace any deformed or damaged contacts.
Replace the high-voltage PCB.
Replace the DC controller PCB.
Completely blank image
Table 6-8 Causes for a completely blank image
Cause
High-voltage PCB is defective (no developing-bias output)
DC controller PCB is defective
Solution
Replace the high-voltage PCB.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
All black or solid color
Table 6-9 Causes for an all black or solid colored image that extends to the edge of the page
Cause Solution
The formatter is not fully seated, or it is defective.
Poor contacts with the primary-charging bias, developing bias, or drum grounding
Cartridge (primary-charging roller) is defective
High-voltage PCB is defective
DC controller PCB is defective
Print an engine test page to make sure that the printer is functioning. If the defect does not appear on the engine test page, replace the formatter.
On the cartridge that is producing the solid color, check the primary-charging bias and developing-bias contacts to the high-voltage PCB, or the drum-grounding contacts. Clean the contacts as necessary. Replace any deformed or damaged contacts.
Replace the cartridge that is producing the solid color.
Replace the high-voltage PCB.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
Dots in vertical lines
Table 6-10 Causes for vertical lines of white dots
Cause
Transfer unit or primary-transfer charging roller is deformed or deteriorated
Solution
Replace the transfer unit.
218 Chapter 6 Troubleshooting ENWW
Table 6-10 Causes for vertical lines of white dots (continued)
Cause Solution
Replace the secondary-transfer charging roller.
Secondary-transfer charging roller is deformed or deteriorated
High-voltage PCB is defective
DC controller PCB is defective
Replace the high-voltage PCB.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
Dirt on back of paper
If the defect is repetitive dirt, go to step A; if not, go to step B.
Table 6-11 Causes for dirt on the back of the paper
Cause Solution
A Repetitive debris (debris on the registration roller, pressure roller, feed roller, fuser delivery roller, or face-down delivery sub-roller)
B Dirty cassette pickup roller, feed guide, fuser inlet guide, or fuser delivery guide
See
Table 6-26 Causes of repetitive defects on page 225
to identify the roller with which the problem is associated.
Clean the dirty roller. Replace the roller if the dirt does not come off.
Clean any dirt from the rollers. Replace the roller if the dirt does not come off.
Dirt on front of paper
If the defect appears in a particular color, go to step A. If it does not appear in a particular color and it is repetitive, go to step B. If it is not repetitive, go to step C.
Table 6-12 Causes for dirt on the front of the paper
Cause Solution
A Defective cartridge (deteriorated toner or scratches on the developing cylinder, photosensitive drum, or primary charging roller)
B Repetitive dirt (dirty registration sub-roller, fuser sleeve, feed sub-roller, or face-down delivery roller)
C Dirty multipurpose tray pickup roller
Defective transfer unit
Defective transfer-unit cleaning blade
Replace the cartridge of the color that matches the defect.
See Table 6-26 Causes of repetitive defects on page 225
to identify the roller with which the problem is associated.
Clean the dirty roller. Replace the roller if the dirt does not come off.
Clean dirt from the roller. Replace the roller if the dirt does not come off.
Check the transfer-unit surface. If it is scratched or dented, replace it.
Replace the transfer unit.
ENWW Image defects 219
Vertical lines
Table 6-13 Causes for vertical lines
Cause
Photosensitive drum has grooves on the circumference
Fuser sleeve has grooves on the circumference
Solution
Replace the cartridge that produces the vertical lines.
For both the OPC and the fuser, these “grooves” might just be dark lines going around the roller. The OPC and fuser can be cleaned in some instances. Use a fine lintfree cloth or coffee filter to gently rub the dark line off the
OPC or fuser roller.
Replace the fuser.
White vertical lines
If the lines appear in a particular color, go to step A. If they appear in a full-color print, go to step B.
Table 6-14 Causes for white vertical lines
Cause Solution
Replace the print cartridge.
A Scratches on the circumference of the developing cylinder (print cartridge)
Scratches on the circumference of the photosensitive drum
B Vertical scratches on the transfer unit
Vertical scratches on the fuser sleeve
Replace the print cartridge.
Replace the transfer unit.
Replace the fuser.
Horizontal line
If the line appears in a particular color, go to step A. If it appears in the full-color print, go to step B.
Table 6-15 Causes for horizontal line
Cause Solution
A The developing cylinder is deformed by remaining engaged with the photosensitive drum for too long.
Horizontal scratches on the photosensitive drum
(cartridge)
See Table 6-26 Causes of repetitive defects on page 225
to determine whether a developing cylinder is involved. If so, print about 20 pages to solve the problem. If the problem is not resolved, replace the cartridge.
Additionally, waiting overnight might help. Print several pages and then let the printer sit overnight. This allows the roller to reform, which can solve the issue.
See Table 6-26 Causes of repetitive defects on page 225
to determine whether a photosensitive drum is involved.
If so, replace the cartridge.
220 Chapter 6 Troubleshooting ENWW
Table 6-15 Causes for horizontal line (continued)
Cause
The print-cartridge cleaning blade leaves a line of toner on the drum (C-blade blur). The line repeats every 77 mm (3.0 inches).
B Horizontal scratches on the fuser sleeve
Solution
At the printer control panel, set CONFIGURE DEVICE/
PRINT QUALITY/OPTIMIZE/ PRE-ROTATION=ON.
See Table 6-26 Causes of repetitive defects on page 225
to determine whether a fuser sleeve is involved. If so, replace the fuser.
White horizontal line
If the line appears in a particular color, go to A. If it appears in full color, go to B.
Table 6-16 Causes for white horizontal lines
Cause Solution
A Horizontal scratches on the photosensitive drum
(cartridge)
B Horizontal scratches on the transfer unit
C The fuser sleeve is deformed by remaining engaged with the pressure roller for too long
See
Table 6-26 Causes of repetitive defects on page 225
to determine whether a photosensitive drum is involved.
If so, replace the print cartridge.
Check the transfer unit surface for horizontal scratches.
If any, replace the transfer unit.
See
Table 6-26 Causes of repetitive defects on page 225
to determine whether the fuser sleeve is involved. If so, replace the fuser.
Color missing
Table 6-17 Causes for a missing color
Cause
Defective laser shutter
Poor developing-bias contacts
Defective cartridge (primary-charging roller)
Laser/scanner unit is defective
High-voltage PCB is defective
DC controller PCB is defective
Solution
Check the problem color laser shutter. Clean the shutter as necessary. Replace the shutter if it is deformed or damaged.
For the cartridge with the problem (color missing), check the developing-bias contacts to the high-voltage PCB.
Clean contacts, if dirty. Replace defective parts if the contacts are deformed or damaged.
Replace the problem (color missing) color cartridge.
Replace the laser/scanner for any missing color.
Calibrate the printer after replacing the laser/scanner.
Replace the high-voltage PCB.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
ENWW Image defects 221
Blank spots
Table 6-18 Causes for blank spots
Cause
Poor secondary-transfer-bias contacts
High-voltage PCB is defective
DC controller PCB is defective
Solution
On the secondary-transfer roller, check the bias contacts to the high-voltage PCB. Clean the contacts as necessary. Replace any deformed or damaged contacts.
Replace the high-voltage PCB.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
Poor fusing
Table 6-19 Causes for poor fusing
Cause
Printer is not properly set for media type
Media is not within specifications
Fuser is not within nip-width specifications
Fuser sleeve is scarred or damaged
Pressure roller is scarred or damaged
Thermistor is deteriorated
DC controller PCB is defective
Solution
Check the media setting in the driver and in the control panel Set the printer for the media type being used.
Use media that meets specifications.
See
Table 6-26 Causes of repetitive defects on page 225
to determine whether a fuser sleeve is involved. If so, replace the fuser sleeve unit.
Replace the fuser.
See
Table 6-26 Causes of repetitive defects on page 225
to determine if a pressure roller is involved. If so, replace the fuser.
Replace the fuser.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
Image distortion
Table 6-20 Causes for distortion or blurring
Cause
Transfer unit is defective
Secondary-transfer roller is defective
DC controller PCB is defective
Solution
Replace the transfer unit. Calibrate the printer after replacing the transfer unit.
If it does not rotate smoothly or is deformed, replace the secondary-transfer roller.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
222 Chapter 6 Troubleshooting ENWW
Color misregistration
If the misregistration occurs in a particular color, go to A. If it occurs in all colors, go to step B. If another misregistration issue is evident, perform the steps in order.
Table 6-21 Causes for color misregistration
Cause Solution
The printer is not calibrated correctly
A
B
Media is not within specifications.
Cartridge is defective
Cartridge drive gears are worn or chipped
Color misregistration sensor is dirty
Color misregistration sensor is defective
Transfer unit is defective
Drive gears are worn or chipped
Image drive unit is defective
Laser/scanner unit is defective
DC controller PCB is defective
Open the front door and remove the ETB shipping locks on each side of the ETB assembly, toward the bottom.
Calibrate the printer.
Verify that media meets specifications.
Check if the photosensitive drum in the problem cartridge rotates smoothly. If not, replace the cartridge.
Check the drive gears connected to the problem cartridge. If a gear is worn or chipped, replace the gear.
Clean the color misregistration sensor lens.
Replace the color misregistration sensor.
If the transfer unit does not rotate smoothly, replace it.
Check the drive gears between the image drive unit and the drum motor. If one is worn or chipped, replace it.
Replace the image drive unit.
Replace the laser/scanner unit.
Replace the DC controller PCB.
Smearing
Table 6-22 Causes for smearing
Cause Solution
Poor contacts exist to each cartridge and printer grounding Use media that is within specifications.
Verify that the proper fuser mode is set.
Clean the grounding contacts on each cartridge and the printer. If the problem remains after cleaning, check the contacts for damage. Replace any deformed or damaged parts. Make sure that all contacts are connected correctly.
Reseat the lever to make the movement smooth.
The movement of the fuser front paper sensor lever is not smooth
Foreign substances or dirt on the fuser inlet guide Clean the fuser inlet guide.
ENWW Image defects 223
Misplaced image
Table 6-23 Causes for a misplaced image
Cause
The oblique rollers are worn (if problem only occurs on the back side of duplex printing only)
DC controller PCB is defective
Solution
Replace the oblique rollers.
Replace the DC controller PCB. Calibrate the printer after replacing the DC controller.
Reversed color
Table 6-24 Causes for reversed color
Cause
The FFC that connects the DC controller to the formatter is not correctly connected
DC controller PCB is defective
Solution
Reseat the FFC to the DC controller PCB J1001.
Replace the DC controller PCB.
Snail tracks
Table 6-25 Causes for snail tracks
Cause
This occurs in high-temperature, high-humidity environments on the second side of duplexing jobs when the fuser pressure roller is bent.
Solution
Use media that is within specifications.
Verify that the proper fuser mode is set.
See if the defect occurs when printing with light coverage. If so, reduce the toner coverage on the page.
Replace the fuser.
NOTE: This defect might be seen when using
A4 media in duplex mode.
NOTE: See the print modes in CONFIGURE DEVICE/ PRINT QUALITY/ PRINT MODES to associate each paper type with a specific print mode. For example, several “BEST” print modes can be set for a specific media type to enhance print quality. Results will vary, depending on the media being used.
See the OPTIMIZE setting for additional print-quality adjustments.
224 Chapter 6 Troubleshooting ENWW
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