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Gap A versus Gap B Comparison
If Gap B is LESS than Gap A, the print needles are worn down
Step 4. Calibrate AFTA using T&D10—AFTA calibrate test.
a. Change the T&D 10 AFTA value until the wheel goes to the chosen wheel position from step 3 on
page 141.
b. Store this value and exit the T&Ds.
Step 5. Reposition the Wheel to indicate '1' when 1-part paper is loaded.
v Remove covers.
v Loosen both AFTA wheel screws.
v Hold the AFTA wheel at reference position '1' and slowly drop it to its normal position. If the two teeth
are touching during the gears engagement, put the marker gear in the first free tooth and tighten both
screws.
Print Head Gap Service Checks
CAUTION:
<2-25> High temperature; switch off the printer and allow at least 20 minutes for parts in this area to cool before
handling.
AFTA allows the printer to maintain a consistent distance between the print head and the face of the forms.
Maintaining this distance (or gap) allows the printer to produce correct print darkness, properly feed forms, and
sustain print head drive operation.
Perform this Service Check if parts of the machine have previously been removed or replaced.
Important: The print head should ONLY be replaced when:
v A print needle is broken, causing missing print dots in characters or "055 AFTA Machine Check"
errors.
v NLQ print quality is deficient due to a damaged/burnt moving ruby coil.
Chosen Wheel Position
Replace print head & repeat samples
Chapter 5. Removals, service checks and adjustments
142
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