Desperately looking for the schematic of the Otari CB-140

[plimousse]

Hi all,
I am in front of an MX-80 with a CB-140 remote.
Error 90 on the remote. I checked the DB25 cable point by point. Cleaned connector 149 on the motherboard.
With the oscilloscope, I see that the remote sends frames... But nothing in return.
I have all the MX-80 schematics, but with the CB-124 remote...
If anyone has the CB-140 schematics, please share them.
Thanks for your help.
Cheers,
Pascal