I have a Yamasa- New Pulsar 93' Pachislo slot machine

I keep getting a E0 Error code - Coin Jam, as the coin passe thru. I have reset the machine...as soon as it hits back part of coin sensor it sets off error code I bought a new coin mech with new sensor identical to my old one figuring the sensor was bad new one does the same thing I'm about out of options don't know what to do or what the cause of this is? PLEASE HELP