Fuse F501 on the A-12738 sound board blows every time the game is turned on (reported on Terminator 2).

Sound board fuse F501 blows at power-on (A-12738)

Cause: A shorted rectifier diode on the sound board; D2 in the reported case, but any of D1 to D4 can do it.

Checks

• Test D1 to D4 on diode setting with the board unpowered.

Fix

• Replace the shorted diode and fuse F501.

Systems

• WPC Dot Matrix

Games

• Terminator 2: Judgment Day

Related tips

• Pre-DCS sound board A-12738
• Adding a line out to the A-12738 sound board
• Sound board beep codes before DCS
• Fitting a manual volume pot to the A-12738
• Pre-DCS sound boards are tuned per game
• Pre-DCS sound cuts out after the game warms up
• Volume stuck at full and buttons do nothing (pre-DCS)
• Pre-DCS speakers pop and get damaged, LM1875 runs hot

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)