Adjusting The Pen Offset - GRAPHTEC CUTTING PRO FC3100-60 Service Manual

5.8 Adjusting the Pen Offset

Note : Before adjusting the pen driver IC's offset, disconnect the encoder lines of the X and Y motors
from the main board's P22 and P32 connectors.
(1) Set the SW1 DIP switch as shown below and then turn on the plotter.
* Set only Bit 8 to OFF
(2) Connect the probe of an oscilloscope to TP13 (Pin 3 of P100) and connect either TP10 or TP15 to
ground level.
(3) The wave-form shown in Fig.1 appears at the oscilloscope.
(4) Turn the VR3 (P-OFFSET) trimmer until the wave-form peaks are the same height as shown in Fig.
2.
(5) When adjustment is completed, return the DIP switch to its default settings and then turn off the
plotter. Also reconnect the X and Y motor encoder lines.
Fig.1
5 - 8
FC3100-60 Service Manual
P/N53802-031T Rev. A
Vertical axis : 1 V/division
Horizontal axis : 2 us/division
Fig.2