Replacing power supply filter capacitor C1
Steps
- Get a 6800 to 10,000 mfd capacitor rated 16 V or more (the original is 2900 or 4700 mfd).
- Clip the old C1 off the board, leaving its leads as long as you can; there is no need to take the power supply apart.
- Solder the new, smaller capacitor to the old leads with the polarity matching.
- Sleeve the new leads in heat-shrink so they cannot touch the metal "L" frame.
- While there, add the ground wire from C1 negative to the backbox (see the ground modification entry).
Systems
Related tips
- System 1 power supply outputs
- Getting to the power supply solder side
- Power supply bring-up, step 1: inputs
- Power supply output connector pins
- Quick checks on the similar System 1 power supply
- Display high-voltage section of the power supply
- Logic and display reference section of the power supply
- Power supply bring-up, step 2: CPU load
Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)