The game plays normally but the sound stops working. Swapping in a known-good Cheap Squeak board brings the sound back.

Sound died: Cheap Squeak clock test point stuck high, bad crystal

Cause: The 6803 on the sound board is not running because its clock is missing. Here the crystal next to the 6803 had failed.

Checks

• Check the supply voltages at the board's test points.
• Probe the clock test point TP4 with a logic probe: it should be switching (a meter reads roughly 2.5 V). Stuck high means no clock.
• Swap the 6803 with one from a working board; if the fault stays with the board, look at the clock parts (crystal and its two small capacitors) and anything else tied to the clock line.

Fix

• Replace the crystal beside the 6803 (match the frequency printed on it).

Systems

• Bally MPU AS-2518-35

Games

• Granny and the Gators

Related tips

• Cheap Squeak sound board gives only faint tones and hum: failed DAC
• Bally -32 sound board only clicks, then plays too high: U11 and the pitch resistor
• Sound module -32 and -50 test points
• Sound Plus -56 and vocalizer test points
• Sounds Plus -56 and Vocalizer test points (Xenon)
• Background sound works in test but not in games: check DIPs 29-30, then reseat connectors

Source: Pinball Repair help group!! (Facebook group)