Jumper Jp2: Contrast Voltage - Aaeon PCM-4330 Instructions Manual

Jumper JP2 on the PCM-4330 board selects the contrast voltage polarity (positive
or negative) for LC-displays. Use the onboard contrast control to set the maximum
contrast voltage. The corresponding value in the setup menu must be set to "o".
After adjustment, software can only select contrast voltage to less than the maxi-
mum set.
Check with the display documentation prior to any adjustment to
ensure that the connected LC-display is capable of supporting the
selected voltage. Unsupported values might damage the display.
See figure 3 for the exact location of jumper JP2:
JP2
3
2
1

Jumper JP2: Contrast Voltage

1 - 2 closed: Negative contrast voltage
3
2
1
2 - 3 Closed: Positive contrast voltage
3
2
1
Contrast Control