A flashlamp flashes weakly or sluggishly, or its bulbs keep burning out.

Flashlamp dull, slow or burning out often

Cause: The 330 ohm 2 W "keep-warm" resistor on the flasher resistor board has burnt, cracked or fallen off its terminal, so the filament is not pre-heated. This resistor carries current all the time the game is on.

Checks

• Inspect the resistor board and measure the 330 ohm resistor.

Fix

• Replace and resolder the 330 ohm 2 W resistor.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Check for power at a coil or flashlamp
• Fire a coil or flashlamp by grounding it

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)