COPYRIGHT © 1995 MERIT INDUSTRIES, INC.
1
Technical Service Bulletin
TSB2A 5-25-95
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5/30/95
merit industries, inc.
Problem:
Prevent CPU board malfunctions caused by electrostatic
discharge.
Games affected:
All Megatouch II countertop games with CRT-260 CPU
board and PCB mounted touchscreen controller. Effects
model number G20-100-001, serial numbers 348702
through 350000 and 380001 through 381750.
Symptoms:
Game locks up, or does not power up at all.
NOTE: If game
does not power up at all, damage may have already occurred.
Call Merit Technical Service (1-800-445-9353).
Cause:
The touchscreen controller board is not adequately
grounded to dissipate electrostatic discharges.
Additionally, the CPU's reset signal is unnecessarily
connected to the controller and may provide a path for a
static shock to damage the reset circuitry.
Solution:
Cut the reset line to the TTL controller board and attach
extra ground braids to the chassis.
Tools:
Materials:
Screwdriver
(2) - 7” 14 (or 16) AWG insulated wire
Wire cutter
(1) -11” 14 (or 16) AWG insulated wire
Pliers or crimper
(1) - #6-32 x 3/8” machine screw
(
4) - #6-32 x 1/2” machine screw
(1) - #4 external tooth lock washer
(4) - #6 external tooth lock washers
(2) - #6-32 kepnut
(6) - #6 or #10 ring lugs
Instructions
1.
If you have ring lugs, attach one to each end of the three pieces of wire. If
you do not have ring lugs, simply wrap the wire around the screw when
you see the term “ring lugs” used in this bulletin.
2.
Open the rear door and slide the CRT-260 into its service position.