COPYRIGHT © 1996 MERIT INDUSTRIES, INC.
TSB-KSD-100-001 - 2-9-96
Customer Service Bulletin
Csbull16.doc
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Date: 2/9/96
merit industries, inc.
Problem:
Darts being counted as “thrown,” without a dart being thrown.
Games affected:
All dart games with switching power supplies. Serial numbers
425766 and up (uprights) and 460482 and up (wall mounts)
Symptoms:
Darts are taken away; a player gets fewer than 3 darts per turn.
Cause:
Improper voltage.
Solution:
Ensure proper voltage by following the steps below.
Instructions
Step 1 - Check R9 Resistor on the RDP28 Target/Microphone Interface Board
1. The resistor located at R9 on the RDP28 board should have a resistance value of
470K
Ω
(color code YELLOW/VIOLET/YELLOW/GOLD). If the R9 resistor does not
have a resistance value of 470K
Ω
, the resistor should be changed. Games with
serial number 428672 or higher were manufactured with the resistor modification. If
you do not have the resistor, contact Merit Customer Service (1-800-445-9353) and
order part number RS1800.
Step 2 - Securing the Power Connector
1. Inspect for cold solder joints on the power supply’s main power connector. Resolder
each of the connector’s pins if this problem is suspected. (See Figures 1 and 2 for
header locations.)
Step 3 - Set the Proper Voltage Level to CPU board & Add Additional +5 Volt Wires
Required parts: (To order these parts pre-assembled, contact Merit Customer Service
and order kit # KSD-100-001)
Upright games:
(2) 261/2” lengths of 18 AWG wire
Wall games:
(2) 14” lengths of 18 AWG wire
All games:
(2) 0.156 header pins
(1) 0.093 female pin
1. Strip 1/4” of insulation off of each end of the wires.
2. Crimp a 0.156 header pin to one end of EACH wire.
3. Crimp the remaining ends together into the 0.093 female pin.
4. Insert the 0.093 female pin into Pin 2 of the J1 connector on the CPU board. (Pin 2
is the only unused pin in the connector.) See Figure 3.
5. Insert the other ends into Pins 2 and 3 of the power supply main header (see
Figures 1 and 2 for header location).
6. Tie wrap the wires to the existing power supply harness.