1. unplug all the plugs from the MPU4, (take a photo before, to remember the plug order) and remove the programe cart. (there may be some additional cables on the prog cart. dissconnect these, but remember the order (take photo) and reconnect them to the prog cart when you re-insert it into the new MPU4)
2. remove the old MPU4 from its metal retaining bracket (there is a spring loaded "plunger" push rod, on the right hand side of the MPU4, around half way down the side. push this rod (and hold) and the MPU4 will lift out of its cradle
3. re-attach the new MPU4 onto its cradle, and reconnect all the plugs you removed (just follow the color key on the MPU4 label, or use the photo you took) take care to plug the plugs in without bending, or miss keying the new MPU4 connectors.
4.plug the program cart into the new MPU4, and reconnect any connectors that were on the prog cart.
5. DOUBLE CHECK THAT ALL THE PLUGS ARE PLUGGED IN CORRECTLY!
6. power up the machine.
Edited by shaun2097, 06 December 2018 - 01:23 am.
Former Fruit Machine Engineer.<br /><br /> 1988-2004.