COPYRIGHT © 1997 MERIT INDUSTRIES, INC.
FLDBLL11
Field Bulletin
PAGE 1 OF 2
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Date: 3-19-97
merit industries, inc.
Issue:
Ultrasonic sensor not working properly.
Games affected:
Scorpion™ dart games with serial numbers 392740 to
393051 and Merkur dart games with serial numbers 450182
to 450611 that are exhibiting problems with the ultrasonic
sensor.
Symptoms:
Automatic player change not working.
Cause:
The exposed end of the unused black wire, concealed in the
orange, ultrasonic cable, is touching the neighboring,
uninsulated drain wire (the drain wire does have a piece of
black insulation covering the section outside of the orange
covering, but it is not insulated inside the orange covering).
Solution:
Put a piece of electrical tape around both exposed ends of
the black wire (the orange wire runs from inside the
ultrasonic sensor assembly to a 6-pin connector at the CPU
board).
Insulating the Exposed Wire
1. Turn off the game.
2. Access the back of the ultrasonic sensor, by removing the assembly from the
target section. The ultrasonic assembly is removed by loosening the wingnuts
securing it to the top of the target section. See Figure 1 for the location of the
ultrasonic sensor assembly. NOTE: THE WIRES SHOULD NOT TOUCH THE
ULTRASONIC SENSOR DIAPHRAGM.
3. Using Figure 2, locate the unused, black wire and place a piece of electrical tape
around the exposed end.
4. Follow the orange cable to its connector on the CPU board. Disconnect the cable
and peel back the shrink wrap around the end of the orange cable to locate the
unused, black wire.
5. Repeat Step 3, above and re-secure the shrink wrap, around the end of the
orange cable, with a piece of electrical tape.
6. Reconnect the ultrasonic cable to the CPU board and reinstall the ultrasonic
assembly
7. Turn on the game.