Re: D700A help with ribbon cable connector
From the service manual and internet pictures it looks like a 26 way vertical FFC connector with 1.00mm pitch.
Have a look here https://www.digikey.com/products/en/connectors-interconnects/ffc-fpc-flat-flexible-connectors/399?k=&pkeyword=&sv=0&pv7=2&sf=1&FV=69%7C409393%2C-8%7C399%2C88%7C159364%2C89%7C6219&quantity=&ColumnSort=0&page=1&pageSize=500
I would just buy a few and choose the most suitable one. Some have a latch and zero-insertion force, some are friction based.