For a Complete SafeRAM Clear, turn the machine power OFF. Unlock and remove the MPU assembly. If SafeRAM Clear EPROMs are required, remove the Main EPROMs from U28 and U43 and replace them with the corresponding clear chips. If EPROMs are not required, turn DIP DS1 sw8 ON. After ensuring that the MPU assembly is firmly seated into the backplane board, press and hold the PSEUDO COIN and TEST buttons, then switch power ON. When the message CH C displays in WIN PAID, release the PSEUDO COIN and TEST buttons. The CH C message is followed by CL C.
Upon a successful SafeRAM Clear, the button and tower lamps flash. Switch power OFF and replace the SafeRAMâ„¢ Clear EPROMs with the Mains, or turn DS1 sw8 OFF. Replace the MPU assembly and switch machine power ON. The machine will enter a Reel Calibration Procedure whereby the home position is recorded in SafeRAM. After real calibration procedure is complete the display will be flashing numbers press the change button and then set any options you want to alter under the 11d menu then close the door. At this point if everything was done correctly the machine should be ready to go. Hope that helps.