The ball leaves the playfield surface and strikes the underside of the glass.
Balls jumping and hitting the glass
Cause: Flipper bats tilted or too strong, or rubber on posts bouncing the ball up.
Checks
- Check the flipper bats move flat to the playfield.
- Check for bent posts.
Fix
- Move the flipper rubber up or down the bat, try a different rubber or a double set.
- Reduce flipper power slightly by setting the EOS switch to open a little sooner.
- On posts, try a thinner or thicker ring, move it up or down, add a second ring at the top, or straighten the post.
Systems
- Williams System 3
- Williams System 4
- Williams System 6 / 6A
- Williams System 7
- Williams System 9
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
- WPC Fliptronics
- WPC DCS
- WPC-Security (WPC-S)
- WPC-95
- Bally MPU AS-2518-17
- Bally MPU AS-2518-35
- Stern MPU-100
- Stern MPU-200
- Bally 6803
- Gottlieb System 1
- Gottlieb System 80
- Gottlieb System 80A
- Gottlieb System 80B
- Gottlieb System 3
- Data East CPU Version 1/2
- Data East CPU Version 3
- Data East/Sega CPU Version 3b
- Capcom
- Electro-mechanical
Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)