Printhead Pressure Adjustment - Intermec EasyCoder PX4i Service Manual

Chapter 8 — Print Unit

Printhead Pressure Adjustment

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The pressure of the thermal printhead against the ribbon or media is fac-
tory adjusted. However, the use of thicker or thinner media than normal
could require the printhead pressure to be readjusted.
Turn the green adjustment knob clockwise for increased pressure, or coun-
terclockwise for less pressure. Print a few labels, preferably test labels, and
check the printout. Increased pressure generally gives a blacker printout
and vice versa. Repeat until the desired result is obtained.
To fi nd the basic setting, proceed as follows:
• Remove the transfer ribbon (if any).
• Load the printer with full width media and close the printhead.
• Adjust the headlift arm to center position.
• Turn the green adjustment knob counterclockwise until it feels loose (no
pressure left).
• Take up the slack in the green knob until you notice an increased resis-
tance.
• Using a 2 mm hexagonal key, loosen the factory adjustment grub screw
(see illustration on the previous page) until the printhead starts to come
up.
• Carefully tighten the grub screw until you just start noticing a small
resistance when trying to pull out the media.
It is possible to apply very high printhead pressure using the factory
adjustment grub screw. Such high pressure may damage the printhead,
the platen roller, and the headlift arm.
Do not use a higher printhead pressure than necessary, because it may
increase the wear of the printhead and thus shorten its life.
• Apply some locking fl uid on the grub screw.
• Raise and lower the printhead.
• EasyCoder PX4i:
Turn the knob 4 full turns clockwise. Each turn increases the pressure by
approx. 1 kp to a total of 4 kp (39.2 N).
EasyCoder PX6i:
Turn the knob 5 full turns clockwise. Each turn increases the pressure by
approx. 1 kp to a total of 5 kp (49.0 N).
• Fine-adjust using test labels and the trial-and-error method (if necessary
after having loaded the transfer ribbon again).
Refer to the illustrations on the next page!
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EasyCoder PX4i and PX6i Service Manual