Why a 1N5817 is the best battery blocking diode

The 1N5817 drops only about 0.2 V, while a 1N914 or 1N4001 drops 0.4 to 0.6 V. With the larger drop the memory sees a "dead" battery sooner, so the cells need changing more often.

Systems

• Bally 6803

Related tips

• High scores of 5,555,555 mean the battery is dead
• Cut the original NiCad off the CPU board now
• CPU board landmarks: battery, LED, relay and ROMs
• Nonsense adjustment values after a battery failure
• Electronic spares for 6803 board repair
• Cybernaut can have a -35, 6802 or 6803 boardset
• Truck Stop and Atlantis: 6803 games built by Williams
• What is on the 6803 CPU board

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)