HP B8C95AA Manuel d'utilisateur télécharger pdf (Page 27)

100

101

If the customer is using non-HP media and after the Image

Quality Test you still have the same image quality problems,

change to genuine HP media and repeat the Image Quality

Test. The best alignment calibration is obtained using HP

Photo Paper.

HP Designjet T Series — Service Manual 1-23

Print quality troubleshooting

Nozzle Health

The print contains three separate parts.

b c

a The Variable Frequency Nozzle health plot with odd/even nozzles

separation. This is used to detect misdirected nozzles, weak nozzles, or

nozzles not working correctly at all frequencies.

b Inspector measuring tool test plot.

Test b should NOT be used by Service Engineers.

c Nozzle Print Test which is also part of the Image Quality Service Plot.

This test is designed to check that the Printhead nozzles print correctly.

The test prints out every single nozzle of each Printhead. No error hiding

or Printhead Alignment algorithm is applied. For each Printhead, you can

see both the adjacent and the consecutive nozzles.

This is what you would see in the Nozzl

e Print Test part if there are

nozzles not printing correctly:

1 On the right of each Printhead Nozzle test, there is a series of numbered

epped diagonal lines. If one or more of the nozzles are malfunctioning or

mis-positioned, you will see that the stepped lines are broken or misdirected

in one or more places.

2 O

n the left of each Printhead Nozzle test, there is a series of horizontal

raight lines. If one or more nozzles are misdirected there will be unequal

spaces between the corresponding lines.

Corrective Action for Nozzle Defects

If the printer has nozzle defects, it doe

s not mean that you will not get

perfect print quality results. The printer has automatic procedures to hide

many nozzle defects.

1 R

ecover the Printheads using the option through the Front Panel (Main

/Image quality maintenance/clean printheads).

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HP B8C95AA Manuel d'utilisateur Page 27

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