Hello David,
Welcome to the forum.
Are you saying that the record is played for around 5/6 seconds with music playing or does the gripper bow return almost immediately in other words the transfer motor keeps turning?
If the styli commes in contact with the record and plays for a short while, try removing the the two pin connection to the cut off board, if the record plays to the end then the fault is just down to the reed switch or adjustment of the cut off board.
If the above is not the case then I suggest that you have the CCC and Mechanism Control Unit checked out.
I send parts to both Australia & New Zealand.
Regards
Alan
Alan Hood
ami-man
UK