Bench-test a Squawk and Talk board

Steps

• Using a PC power supply, wire its ground to TP1, its +12 V to TP3 and its -5 V to TP4; do not feed TP2, which the board makes from the 12 V.
• Plug an 8 ohm speaker into J2 (pins 1 and 2).
• To reset without cycling power, briefly ground TP12 (U15 pin 4) with a jumper; this also works in the game.
• Once booted, press SW1 to make it talk.

Systems

• Bally MPU AS-2518-35

Related tips

• The Squawk and Talk test button can lock the board up
• Squawk and Talk LED flash codes
• Squawk and Talk: distorted sound or hum
• Squawk and Talk LED stays on and the board never boots
• Squawk and Talk stops at four flashes
• Speech quieter than sound effects until the game warms up
• Squawk & Talk -61 and Say It Again -81 test points
• Bench-test a -51/-56 sound board with a test EPROM

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