Oki ML521, ML520 manual Principles of Operation Printhead Gap Information

Models: ML521 ML520

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Service Guide ML520/521

Chapter 2 Principles of Operation

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 pages thickness is checked while a job is printing.

Page 61
Image 61
Oki ML521, ML520 manual Principles of Operation Printhead Gap Information