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Service Guide ML172/ML182 Series
Chapter 3 Printer Maintenance
3.3.1 ADJUSTMENTS - Head Gap Adjustment
Required Tools:
Feeler Gauge (.019 inch)
Phillips Screwdriver (#2)
Jewelers Screwdriver
Adjustment Procedure:
1. Turn the AC Power OFF and remove the AC plug from the power receptacle.
2. Remove the printer access cover.
3. Remove the ribbon cartridge.
4. Set the gap adjusting lever to range #1.
5. Move the paper lock release lever to the rear.
6. Insert a 0.019 inch thickness gauge between the platen and the printhead. Make sure that the
thickness gauge can be smoothly inserted, although a small amount of friction is acceptable.
7. If adjustment of the gap is required, press down on the adjusting gear with a jewelers screwdriver to
disengage the gear from the adjusting lever. Adjust the gap by turning the adjusting screw with a
screwdriver.
8. After adjustment, move the adjusting lever from position 1 to 3 and then back to position 1. Recheck
the head gap once more. The gap must be between .017 inch and .019 inch.
NOTE: Perform Steps 6, 7 and 8 at both ends of the platen.