manuals/manuals_Support_Center_Bulletins_PDF_csbull16

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.

TSB-KSD-100-001 - 2-9-96

Customer Service Bulletin

Csbull16.doc

Step 4 - Check the Power Supply for Proper Voltage & Test Missed Dart Sensitivity

1. Lower the voltage from the power supply to +5V. (To check the voltage, attach a

voltage meter to the middle pins on the J1 connector on the main CPU board: see
Figure 3 for location of positive and negative voltage.) (See Figures 1 and 2 for
adjusting the power supply output of your power supply. If your game uses an Autec
Power Systems power supply, see Figure 1; if your game uses an International
Power Sources power supply, see Figure 2.)

1. Next, enter the Missed Dart Detector/Automatic Player Change Test (found in your

owner’s manual). The Player 1 lamp should light when the target section is tapped
gently. If the light stays on without a tap, there is a bad chip on the RDP28
microphone board; call Merit Customer Service to order a new RDP28 board. If this
test is passed, raise the voltage back to between +5.15V +5.17V.

Figure 1 - Autec Power

Systems Power Supply

Figure 2 - International Power

Sources Power Supply

Figure 3 - Location of J1 Header on CPU Board

Main Header

VR1 Output
Control

Pin 2

Pin 3

VR1 Output

Control

Pin 2

Pin 3

J1 Header

Main CPU
Board

Pin 2

—