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CHAPTER 4: TROUBLESHOOTING
Game Won't Power Up
Control Board Power-Up Test Sequence
No General Illumination Lamps
Lamps Always On or Off During Gameplay
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Phase "A" and "B" Lamp Tables
The Biphase Lamp Circuit: A Closer Look
Typical Biphase Lamp Circuit
Remedies for "Tough Dog" Lamp Problems
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Improper Display Digits
Improper Display Patterns
One or Several Displays Always Off
No Flipper Solenoids
Flippers: A Closer Look
Remedies for "Tough Dog" Flipper Problems
Typical Flipper Circuit
Coils Not Operating Correctly
Coils Always On
Coil Table
Remedies for "Tough Dog" Coil Problems
Typical Momentary Solenoid Driver Circuit
Solenoid Expander
Switches Don't Score
Switch Matrix Table
Complete Playfield Switch Circuit
No Sound
Sound Interface Board
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4-1