Moving an EM transformer to the high tap

Steps

• Unplug the game.
• Find the four lugs on top of the transformer and identify the Normal tap (with the factory wire) and the High tap (unused).
• Unsolder the coil supply wire from the Normal tap and solder it to the High tap. Do not move the line cord wire on the bottom lugs, even if one is marked normal.
• Test play. Coils run a few volts hotter and faster; lamps are on a separate tap and are not affected.

Unplug first. The high tap puts out about 33 V or 57 V depending on the game; the transformer primary carries 110 V line voltage, which can kill.

Systems

• Electro-mechanical

Related tips

• High tap: a little more coil power from the transformer
• Test an EM transformer
• What the EM transformer supplies
• EM transformers almost never fail

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)