Printronix SLPA7000 User Manual page 236

Chapter 6
Removal And Replacement Procedures
Adjusting Head Pressure Blocks
The pressure blocks should be positioned to obtain a uniform printing density
across the media. In most cases, only the right pressure block will need
adjustment. For the best printing quality under a variety of media and ribbon
conditions, adjust printhead pressure blocks as explained below.
1. Under normal printing conditions, align the index mark on the left
pressure block with the bold line on the left side of the pressure block
adjustment scale. If you use media and ribbon widths of less than one-
third of the printer's maximum printing width, you may have to move the
left pressure block further left.
2. The usual setting for the right pressure block is to match the ribbon width
by using the scale. For example, for a 110 mm ribbon, set the index mark
to 110 on the scale, as shown below. (The scale is graduated in
millimeters.) If necessary, move the right pressure block by turning the
lead screw knob.
NOTE: If the width of the media is less than the width of the ribbon, align the
3. To check the correctness of the pressure block positions, print a grey test
pattern (page 163). The pressure is correct if the grey test pattern is
uniform across the media.
Index Mark
Bold Line
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right pressure block handle with the right edge of the media. To
ensure good print quality, the width of the media should be more than
75% of the width of the ribbon.
Left Pressure Block
Pressure Block
Adjustment Scale
Figure 35. The Head Pressure Blocks
Right Pressure
Index Mark
Block
Lead Screw
Knob
110 mm Mark