Squawk and Talk LED flash codes

A brief flicker at power-on shows reset released (C1 charges through R1 until U15 sees 1.7 V); none points to U5, U15, a leaky C1, open R1, leaky CR1 or U17. Flash 1: RAM U6 passed (else U6, U15 or U17). Flash 2: PIA U7 passed. Flash 3: PIA U11 passed (page 71). Flash 4: sound chip U12 passed (U11 or wiring can also stop it). Flash 5: speech chip U8 initialized (U7 or wiring can also stop it).

Systems

• Bally MPU AS-2518-35

Related tips

• Squawk and Talk LED stays on and the board never boots
• Squawk and Talk test points
• Bench-test a Squawk and Talk board
• The Squawk and Talk test button can lock the board up
• Squawk and Talk: distorted sound or hum
• Speech quieter than sound effects until the game warms up
• Squawk & Talk -61 and Say It Again -81 test points
• Game locks up after the seventh flash

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)