Service manual

COPYRIGHT © 2005 MERIT INDUSTRIES, INC.
Troubleshooting Information - Troubleshooting Your Touchscreen
Megatouch MAXX Technical Reference Manual
Troubleshooting Your Touchscreen (cont’d)
• If these solutions do not correct the problem, replace the touchscreen.
• If the calibration is off in one area, check for scratches or nicks on the screen. If you
detect scratches or nicks, replace the touchscreen.
• If the screen loses calibration entirely, check the ground pin on the line cord.
• If the touchscreen locks up or does not respond to touch:
• If the graphics are moving on the screen and the green LED is lit, switch the
controller with a working one to see if the controller is the problem. If the
controller is not the problem, there is a communication error between the
motherboard and controller. Do a CMOS configuration and if this doesn’t fix
the problem, the motherboard may need to be replaced.
• If the graphics are moving on the screen and the green LED is not lit, contact
Merit Technical Support at [phone]
• Microwave ovens and neon lights can and will interfere with the calibration of the
touchscreen and should not be within 6 feet (or 2 meters) of the game.
• Improper grounding will affect the operation of the touchscreen.
• If you are experiencing problems with double-touching (e.g. two cards are taken
away after only one touch to the screen), make sure the A/C plug and wall outlets
are properly grounded.
• The touchscreen cable should not positioned under or on top of the yoke of the
monitor.
• The touchscreen controller cable should not positioned near the flyback transformer.
NOTE: If the cable was incorrectly installed, the cable will be on the right side of the tube
and the touchscreen response will be out of sync by 180 degrees.
FIGURE 1 - MICROTOUCH TOUCHSCREEN OVERLAY CONNECTOR SCHEMATIC