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5.6.11 Replacing the quartz crystal with a TTL Oscillator.

5.6.10 List of Acceptable TTL Chip Substitutes on a System 80 CPU Board.

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5.6.9 Using a PC Power Supply For Bench Testing.

5.6.8 Connecting a logic probe to the MPU.

5.6.7.3 An Alternate to the Daughter Board on System 80B MPU Boards.

5.6.7.2 System 80B Daughter Board Replacement Options.

5.6.7.1 Continuity Chart of Pinouts for Damaged U2 / U3 Area.

5.6.7 System 80B Daughter Board Solder Joints.

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5.6.5 Using a Reset Generator for the CPU Reset Section.

5.6.4 Relocating the battery from the MPU board.

5.6.2 Erratic Boot Issues with Later 80B Games (Hot Shots, Bad Girls, and Big House).

5.5.6 F2 Fuse Blows At Power Up on 80A games.

5.5.5.7 System 80 First Generation "Sounds Only" Sound Board LED's.

5.5.5.6 System 80/80A Power Supply Board LED.

5.5.5.5 Sound/Speech Power Supply Board LED's.

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5.5.5.4 Auxiliary Lamp Driver Board LED.

5.5.5 Optional Bling.Adding Power Indicating LED's to Boards.

5.5.4 Recommended Repairs for the System 80B Power Supply Board.

5.5.3 Recommended Updates and Repairs for the System 80/80A Power Supply Board.

5.5.2 Sporadic / Inconsistent / Missing Voltages.

5.5.1 Replacing the Orange Filtering Capacitor.5.4.2.3 Ground Improvements for System 80B at the Transformer Panel - "Arena" to "Bone Busters".5.4.2.2 Ground Improvements for System 80B at the Transformer Panel - "Tag Team Pinball" to "Spring Break".5.4.2.1 Ground Improvements for System 80A / 80B at the Transformer Panel - "The Games" to "Bounty Hunter".5.4.2 Recommended Ground Improvements for System 80B.5.4.1.1 Grounds Improvements for System 80A at Transformer Panel.5.4.1 Recommended Ground Improvements for System 80/80A/80B Boards.5.3.1 Adding Ground and 5V Connections to Interconnect Harness.5.3 The CPU / Driver Board Interconnect Harness.5.2.2 Alternate Method of Replacing (Repinning) System 80 Connectors.5.2.1 Replacing (Repinning) System 80 Connectors.4.7.6 System 80B Sound Board (one button).4.7.5 System 80B Sound Board (two button).4.4.5 5th Generation CPU Board (System 80B).4.4.4 4th Generation CPU Board (System 80A).4.3.2 System 80 / 80A Sound & Speech Power Supply.4.2 System 80 / 80A / 80B Satellite Boards.3.7.2 Pausing the Lamp and Solenoid Test (System 80B Only).3.7.1 Default High Score To Date (HSTD).3.6.4.1 Free Play Diode Board Modification.3.4.3 The "Missing" Gottlieb® System 80 Switches.3.1.2 Theory of Operation & Repair Guides.