Akai S1000 / S1100 samplers

Does anyone have a pdf of the S1100 service manual? I have a paper copy of the S1100 manual which contains a version 2.0 addendum and it states "the S1100 Version 2.00 requires a hardware change to be made as well as having the two ROMs fitted". I have the 2.00 Roms but I have no idea what this hardware change requires. I do know that every time I try to invoke the direct-to-disk features which 2.00 provides the S1100 displays a message indicating "HARDWARE CHANGE NEEDED FOR DD OPERATION". 

Thanks,

Mike Wolak