Electrolux T5190LE - 3 External Coin Meter;Central Payment (2 K)

Service Manual
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12.4.3 External coin meter/Central payment (2K)
The signal received from external coin meters must be a pulse between 300–3000 ms (500 ms is recommended)
with a minimum pause of 300 ms (500 ms is recommended) between two pulses.
fig.7438