Increase Slack in Coin Acceptor
When coin is begin inserted into the coin acceptor slot, and it is being return to the customer, without incrementing the timer. One possible issue may be that the inserted coin is not matching the target coin inside the coin acceptor. If this is a case increase the slack on the coin comparison. To do so find the white turn knock located at the back of the acceptor and gently turn it clockwise. Do not push too hard as it may damage the adjustment.