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Service Guide ML590/ML591
Chapter 1 Product Specifications
Printhead Gap Information
Three items factor into printhead gap information.
1. Printhead Gap Adjustment
This is a
SERVICE ADJUSTMENT
made by a technician.
It is covered in Section 3.3 of this Service Handbook.
The Adjustment measures 0.014, +/- 0.001 inches (0.35, +/- 0.03 mm).
2. Printhead Gap Adjust
This is a
MENU ITEM
in the
SET-UP
Group.
It fine tunes the automatic setting of the printhead gap.
The settings are 0, 1, and -1.
0 is the factory default.
Use 1 to darken print (if output is consistently light).
Use - 1 to lighten print (if output is consistently dark).
3. Gap Control
This is a
MENU ITEM
in each [Paper Feed] Group.
The Groups are
REAR FEED, BOTTOM FEED,
and
TOP FEED
.
Gap Control determines how the printhead gap is set.
The settings are listed below.
Auto Gap, Semi Auto Gap, 1, 2, 3, 4, 5, 6, 7, 8, 9
An explanation of each setting follows.
Auto Gap
This is the factory default.
Automatically determines paper thickness of the first page.
During single-sheet feed, each page's thickness is checked while
a job is printing.
Semi Auto Gap
Similar to Auto Gap.
Automatically determines paper thickness of the first page.
During single-sheet feed, each page's thickness IS NOT checked
"while" a job is printing
1, 2, 3, 4, 5, 6, 7, 8, 9
Used when the same paper is used ALL of the time.
Bypasses the automatic head gap adjustment.
1 is the narrowest gap setting.
9 is the widest gap setting.