Test an EM transformer

Steps

• Find the secondary lugs; usually three outputs with one common.
• Set the meter to AC volts and put one lead on the common lug (not on ground).
• Touch the other lead to each output lug: expect about 6 V AC for lamps and 25 to 50 V AC for coils.
• The two primary lugs carry line voltage.

The primary lugs are at 120 V line voltage while the game is plugged in.

Systems

• Electro-mechanical

Related tips

• What the EM transformer supplies
• Moving an EM transformer to the high tap
• High tap: a little more coil power from the transformer
• EM transformer high and normal tap positions by maker

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)