Figure 32A Amplifone Video Display CRT Removal

ANODE CONNECTOR

SOCKET (3

2-PIN CONNECTOR

RETAINER

HIGH-VOLTAGE PCB

RETAINER

SCREW

RETAINER

SCREW

ANODE CONNECTOR

SOCKET (3

2-PIN CONNECTOR

RETAINER

HIGH-VOLTAGE PCB

HARNESS

15-PIN CONNECTOR

Figure 3-2B Amplifone Video Display High-Voltage PCB Removal

HARNESS

15-PIN CONNECTOR

Figure 3-2B Amplifone Video Display High-Voltage PCB Removal

Figure 3-2C Amplifone Video Display Deflection PCB Removal

The following procedure should only be performed by a qualified service technician. Before removing or repairing the video display, unplug the game.

High voltages may exist in any video display, even with power disconnected. Use extreme caution and do not touch electrical parts of the display yoke area with your hands or with metal objects in your hands!

Discharge the high-voltage from the cathode ray tube as follows: Attach one end of a large, well-insulated, 20-kV jumper to ground. Momentarily touch the free end of the grounded jumper to the anode by sliding it under the anode cap. Wait two minutes and discharge the anode again.

IMPLOSION HAZARD

If you drop the display and the picture tube breaks, it will implode! Shattered glass and the yoke can fly six feet or more from the implosion. Use care when replacing any display.

Your game has either an Amplifone or a Wells-Gardner 19-Inch Color X-Y cathode ray tube (CRT). Use the following procedures to remove and reinstall your CRT. Refer to Figures 4-3 and 4-4 for parts information.

The Amplifone Color X-Y Display consists of the following three assemblies:

• 19-inch Amplifone cathode-ray tube (CRT)

• Deflection printed-circuit board (PCB) calibrated to match the CRT

• High-Voltage PCB (To adjust FOCUS and BRIGHTNESS, refer to TM-194, the Amplifone 19-Inch Color X-Y Display manual.)

Removing the Amplifone CRT:

1. Open the rear access panel. Disconnect the 15-pin harness connector wired to the Deflection PCB (see Figure 3-2C).

2. Discharge the high-voltage from the CRT (refer to the preceding WARNING for this procedure).

3. Carefully disconnect the high-voltage anode connector from the CRT (see Figure 3-2A).

4. Unplug the socket from the rear of the CRT.

5. Unplug the degaussing coil 2-pin connector from the Deflection PCB.

6. Unplug the 5-pin connector from the Deflection PCB.

7. Unplug the 2-pin connector to the DAG spring that goes across the back of the CRT.

8. From the front of the game, open the control panel (see Figure 3-4).

9. Securely grasp the metal retainer that supports the display shield (see Figure 3-2A). Remove the retainer and shield by sliding them down and out of the cabinet.

10. Remove the cardboard bezel.

11. Remove the four sets of hardware that secure the CRT to the wood frame.

12. Carefully remove the CRT out through the front of the cabinet. Place it on a soft mat in a protected location.

13. To install an Amplifone CRT, reverse the order of this procedure.

Removing the Amplifone High-Voltage PCB:

1. Discharge the high-voltage from the CRT (refer to the preceding WARNING for this procedure).

2. Carefully disconnect the high-voltage anode connector from the CRT (see Figure 3-2B).

3. Unplug the socket from the rear of the CRT.

4. Unplug 9-pin connector P109 from the Deflection PCB.

5. Unplug the 2-pin connectorfrom the DAG spring.

6. Remove the hardware that secures the High-Voltage PCB and two harnesses to the game cabinet.

7. Slide the High-Voltage PCB from the wood retainers.

8. To install a High-Voltage PCB, reverse the order of this procedure.

Removing the Amplifone Deflection PCB:

1. Unplug the four connectors from the Deflection PCB (see Figure 3-2C).

2. Remove the hardware that secures the Deflection PCB to the game cabinet.

3. Slide the Deflection PCB from the wood retainers.

4. To install the Deflection PCB, reverse the order of this procedure.

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