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ESTRICTED USE ONLY Fargo Electronics, Inc.
Persona C10/M10 ID Card Printer Service Manual (Rev. 4.0)
93
Calibrating the Printhead
Caution No. 1: This device is electrostatic sensitive. It may be damaged if
exposed to static electrical discharges. (Discharges may be generated by various means,
such as walking on a carpeted floor.) Be sure to observe all established Electro-Static
Caution No. 2: Discharge (ESD) procedures while handling cables in or near the
Circuit Board and Printhead Assemblies. Always wear an appropriate personal grounding
device, such as a wrist strap with integral resistor, connected to an ESD ground to avoid
potential damage. At a minimum, make positive contact with the bare metal chassis of the
printer with the hand before proceeding with the procedure.
Adjusting the RP1 Potentiometer
The RP1 potentiometer controls the lightness and darkness of the printed image. When a
new printhead is installed, it may need to be adjusted. Follow the steps below to perform this
minor adjustment.
When the Printhead Harness is replaced (along with the power and data cables for the
printhead), the Board Assembly, Ribbon Sensor, and Headlift Sensor Switch are also
terminated in the Upper Imaging Assembly.
To calibrate the Ribbon Sensor, see Calibrate the Ribbon Sensor. (Note: Do not over-
tighten the mounting screw when installing the Headlift Sensor Switch. The screw should be
snug up to the plastic housing of the switch.)
Step Procedure
1 Locate the three small holes on the right-hand side of the printer. RP1 is located
within the first hole down from the top.
2 Run a self test. The self test will print 15 gray scale boxes.
3 Turn RP1 clockwise in 1/8-turn increments if the output is too dark. Adjust RP1
counterclockwise in 1/8-turn increments if it is too light. Continue to adjust
RP1and run self tests until the desired intensity is achieved.
Consult Make Mechanical Adjustments to the Printhead if mechanical
adjustments are needed to achieve the correct intensity level.