Figure 36 Midi Trak BallT

WARNING

Before removing or repairing the Midi Trak-Ball™, turn the game off.

6. Remove the screw, flat washer, and split-lock washer that secure the encoding wheel.

7. Remove the encoding wheel. Reassemble and reinstall in reverse order.

Lubricating the Midi Trak-Ball™ Assembly:

1. Remove the entire Midi Trak-Ball™ assembly from the control panel (see Figure 3-5). Remove the six screws that secure the upper and lower frames together (see Figure 3-6).

2. Lift off the upper frame.

3. Lubricate each of the six ball bearings with two drops of a light-duty oil, such as 3-in-One oil. Lubricate the bearings approximately every three months or 6,000 credits (credits are counted on the coin counter).

Coupler PCB,

Removing the Midi Trak-Ball™, and Encoding Wheel:

4. Perform steps 1 and 2. Remove the Midi Trak-Ball™.

5. Lift the Coupler PCB out of its slot. Carefully disconnect the red connector and remove the PCB.

NOTE

When you replace the Coupler PCB, make sure that the metal encoding wheel is not bent or damaged. It should turn freely between the two halves of the optical coupler.

Adjusting the Midi Trak-Ball™ control:

8. When you tighten the encoding wheel, rotate the socket-head screw on the end of the roller shaft until a hole in the shaft is visible through the hole in the upper frame.

9. Insert a /8-inch diameter pin or screwdriver through the hole in the shaft.

10. Tighten the socket-head screw with an Allen wrench.

HOLE IN

HOLE IN

HOLE IN ROLLER SHAFT

SOCKET-HEAD SCREW

Figure 3-6 Midi Trak-Ball , continued

HOLE IN ROLLER SHAFT

SOCKET-HEAD SCREW

Figure 3-6 Midi Trak-Ball , continued

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