Doing a quick compare the Sharp PC925L0NSZ0F seems like a better match for the Toshiba TLP351 and then the 6-7 pin short makes more sense. Phill are you sure about the PC11 part number you posted?
I can't be sure because mine is missing but it's my best guess, the accociated circuit is the same as the other drive opto's.
So Phill are you saying that on your board they have a Sharp brand opto instead of the Toshiba TLP351 shown in Siniji's photo?
Yep, I have the Sharp opto's on mine.
I've attached some pics of my board. I bought the unit about 3 weeks ago.
I thought the board might be a different revision because of the board shape and the missing track with the white line between PC11 and CN3 on my board compared to Siniji's photo.
You will notice that the link wire to P+ is missing and D1 on the back also in my photo's.
One of the questions I still haven't answered is why they have disabled the input power relay. It is wire linked (Q1) to be permanently on and the opto is missing (PC12).
The control electronics would get power through R8 if it was off and the drive power would be disconnect from the mains. I wonder if that switching feature is required to disconnect the drive power from the mains when in braking mode.
Just some thoughts.
Still working on the circuit drawing,