HP DesignJet 8000s User Manual

							
13.Press the  key, and then the  OK key to display the media advance calibration value.
14. Enter the media advance adjustment value, and press the  OK key.
Set a numeric value with the 
 and  keys.
NOTE Select a mean value if the media advance  value is different in every color. If you
have an image that uses one particular color, then set the value based on that color.
Set a mean value if the media advance value differs between the left and right sides of the
media.
Different values between the left and right  sides of the media may be caused by skew.
15.Press the  OK key to confirm.
Printhead position adjustment
Use the printhead print position test patterns to  calibrate the following printhead positions:
● Printhead to printhead position — 
adjusts the printhead position for the scan axis using the black
printhead as a reference.
● Bidirectional printing position.
To print the printhead to printhead position pattern:
1. In the  TEST PRINTS  menu scroll to the  PH TO PH option and press the  OK key.
2. Press the  OK key to start printing.
ENWW How do I calibrate my printer 121
How do I get the best image
qualit
y
 
						

							
To set the printhead to printhead adjustment value:
1.Select  ADJUST  and press the  OK key.
2. Select  YY PH TO PH VAL  and press the OK key.
3. Select the printhead color to be adjusted, and press the  OK key.
4. In the printhead adjustment patt ern, identify the value where the vertical black line and the color
printhead lines are perfectly aligned. In the  image below, the correct value for Lc is +2.
5.Insert the value and press  OK key.
Select the number you want  to change by using the 
 and  keys and change the numeric value using
the  and  keys.
6. Use the same procedure to adjust the other colors.
To print the bidirectional printing position pattern:
1. In the  TEST PRINTS  menu scroll to the  BIDIRECTION DEF  option and press the  OK key.
122 Chapter 7   How do I get the best image quality ENWW
How do I get the best image
qualit
y
 
						

							
2.Press the  OK key to start printing.
To set the bidirectional printing adjustment:
1. Select  ADJUST  and press the  OK key.
2. Select  BIDIRECTION DEF  and press the OK key.
3. Select the printhead color to be adjusted, and press the  OK key.
4. In the printhead adjustment pattern, identify the va lue where two vertical lines for the same printhead
are aligned. In the image below, the correct value for M is –8.
5. Insert the value and press  OK key.
ENWW How do I calibrate my printer 123
How do I get the best image
qualit
y
 
						

							
Select the number you want to change by using the  and  keys and change the numeric value using
the  and  keys.
Printhead nozzle position adjustment
Use the printhead nozzle positio n test patterns to calibrate the printhead nozzle positions.
To print the printhead nozzle position pattern:
1. In the  TEST PRINTS  menu scroll to the  NOZZLE POS ADJ  option and press the  OK key.
2. Press the  OK key to start printing.
1. Use section 1 to identify the printh ead nozzle to be used as the reference.
2. Use section 2 to determine the corre ction value for the other printheads.
3. Identify the line of the printhead nozzle closest to t he print platen (indicated as A in the image). In this
example, the printhead nozzle (tha t is closest to the print Platen) to be used as the reference is
indicated as B in the image.
124 Chapter 7   How do I get the best image quality ENWW
How do I get the best image
qualit
y
 
						

							
4.A. For each printhead line, identify the value where t he reference printhead is aligned. In this example
image, for the Magenta line the correction  value is 1 (indicated as A in the image).
To set printhead nozzle position adjustment values:
1.Select  ADJUST  and press the  OK key.
2. Select  NOZZLE POS VAL  and press the OK key.
3. Select the printhead color to be adjusted, and press the  OK key.
4. Insert the value and press  OK key.
Select the number you want to change by using the 
 and  keys and change the numeric value using
the  and  keys.
Line sensor position adjustment
This test pattern is used only for HP Supp ort purposes to calibrate the line sensor.
Back feed adjustment print
This option prints a pattern so that you can adjust  how much back feed is applied to a media type that you
are loading.
1. Press the  ONLINE key.
2.Press the  key, and select  BACK ADJ PRINT  and the OK key.
Select the print mode you usually use  for the media that you are calibrating.
Select the  NORMAL media feed adjustment print if adjusting the high speed mode.
Select a parameter based on your print mode.
Parameters:
● NORMAL
 — standard and high speed print modes (720 x 720 dpi – 8 passes).
● H-QUAL
 — high quality print mode (720 x 720 dpi – 16 passes).
ENWW How do I calibrate my printer 125
How do I get the best image
qualit
y
 
						

							
●H-DENS
 — high density print mode (720 x 720 dpi – 16 passes).
● DRAFT
 — draft print mode (360 x 720 dpi – 4 passes).
● FINE DRAFT
 — fine draft print mode (540 x 720 dpi – 6 passes).
● 3 TIMES
 — high quality, high density prin t mode (720 x 720 dpi – 24 passes).
126 Chapter 7   How do I get the best image quality ENWW
How do I get the best image
qualit
y
 
						

							
Adjust heater and print mode settings
If you see banding in all colors and you have already performed media advance calibration, then you can
try adjusting the heater temperature and print mode settings.
Banding in all colors may be caused by the following factors:
● Small print dot size: heat will cause a smaller dot si
ze. The higher you set the heater temperature, the
smaller the dot size is which results in light banding.
● Ink absorption by the media: if the media you are us
ing is not capable of absorbing the ink as it is
placed, then this can re sult in dark banding.
To improve ink placement and absorption try the following:
● Set a lower print heater temperature for light b
anding or a higher temperature for dark banding.
● Change the print mode to reduce the quantity 
of ink placed on the media for dark banding.
● Change the print mode from bidirectional prin
ting to unidirectional printing for dark banding.
After each change to a setting, try printing the  nozzle print pattern to check the image quality.
To change the heater temperature and print mode settings:
1. Press the  ONLINE key and select the  MEDIA REG menu with the 
 key.
2.Select  PRINT HEATER T  in the MEDIA REG  menu with the  and  keys.
Parameters:  15  °C to  55 °C, or  ** to turn the heater off.
NOTE This value will only be applied if the   HEATER PREF option is set to HEAT
PANEL .
3.Select the number you want to change by using the  and  keys and change the numeric value using
the  and  keys.
4. Press the  OK key to confirm the parameter.
Print the nozzle print pattern to check the image quality.
5. To change the Print mode:
Select  PRINT MODE.  in the MEDIA REG  menu with the 
 and  keys.
ENWW Adjust heater and print mode settings 127
How do I get the best image
qualit
y
 
						

							
6.To change the option setting displayed, press the  OK key.
7. Using the  and  keys, select a print mode that places  less ink on the media and increases the
number of passes.
Parameters:
● NORMAL
 — standard and high speed print modes (720 x 720 dpi – 8 passes) — ink usage
100%.
● H-QUALITY
 — high quality print mode (720 x 720 dpi – 16 passes) — ink usage 100%.
● H-DENSITY
 — high density print mode (720 x 720 dpi – 16 passes) — ink usage 200%.
● 3 TIMES
 — high quality, high density print mode (720 x 720 dpi – 24 passes) — ink usage 300%.
● DRAFT
 — draft print mode (360 x 720 dpi – 4 passes) — ink usage 50%.
● FAST
 — fast print mode (720 x 720 dpi – 8 passes) — ink usage 100%.
● F-H-QUALITY
 — high quality print mode (720 x 720 dpi – 16 passes) — ink usage 100%.
● F-H-DENSITY
 — Fast high density print mode (720 x 720 dpi – 16 passes) — ink usage 200%.
● F-3 TIMES
 — Normal very high density print mode (720 x 720 dpi – 24 passes) — ink usage
300%.
● FINE DRAFT
 — Fine draft print mode (540 x 720 dpi – 6 passes) — ink usage 67%.
● FINE
 — Fine print mode (720 x 720 dpi – 8 passes) — ink usage 100%.
● F-FINE
 — Fast fine print mode (720 x 720 dpi – 8 passes) — ink usage 100%.
NOTE This value will only be applied by th e printer front panel setting if the PRINT MODE
PREF  option is set to   FRONT PANEL .
8.Press the  OK key to confirm the parameter.
Print the nozzle print patter n to check the image quality.
9. To change the print direction mode to unidirectional, select  PRINT DIRECTION with the 
 and  keys
in the  MEDIA REG  menu.
10.Select  UNIDIR  with the  and  keys for unidirectional printing.
11. Press the  OK key to confirm the parameter.
128 Chapter 7   How do I get the best image quality ENWW
How do I get the best image
qualit
y
 
						

							
If the image quality still does not improve, we recommend that you change the media.
ENWW Adjust heater and print mode settings 129
How do I get the best image
qualit
y
 
						

							
130 Chapter 7   How do I get the best image quality ENWW
How do I get the best image
qualit
y