OKIDATA Pacemark 3410, Service Manual

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Page: 67
Service Guide PM3410
Chapter 3 Maintenance & Disassembly
3.3.02 Printhead Gap
NOTES:
The information in this section is also covered in Technical Service Bulletin 1603. A Pacemark 3410
Replacement Printhead Kit includes the items listed below.
Technical Service Bulletin 1603
Read Me First Card
Head Gap Lever Adjustment Sticker
90 Day Warranty Extension Card
General Information
Before performing this adjustment, always verify that the printhead is properly installed.
The printhead gap adjustment should be performed when the following occur.
Print quality is darker on one side of the document.
Parts / Assemblies are replaced.
Printhead Assembly (3.2.01)
Platen Assembly (3.2.16)
Carriage Shaft (3.2.22)
The printhead gap should measure .014 +/- .002 inches (0.35 +/- 0.05 millimeters).
This adjustment has four phases.
1. Setup Phase (Steps 1 - 6)
The cover is removed and the printhead is placed at a known reference point.
2. Printhead Gap Modification Phase (Steps 7 - 9)
The distance between the printhead and the platen at the left (line feed motor) side of the platen is
modified by rotating the left eccentric collar. Rotating the eccentric collar varies the position of the carriage
shaft relative to the platen.
3. Parallel Adjustment Phase (Steps 10 - 12)
The right eccentric collar is rotated to ensure that the printhead moves parallel to the platen (at the correct
gap setting).
4. Check Phase (Steps 13 - 16)
This phase verifies that the Parallel Adjustment Phase did not affect the Printhead Gap Modification
Phase.
Procedure
NOTE:
The printhead gap must measure .014 +/- .002 inches (0.35 +/- 0.05 millimeters).
Setup Phase (Steps 1 - 6)