Adjusting the timing can be found in the 930 service manual.(Not the usual knitting machine manual.)
Be warned, this is a very technical book.
The service manual for 930 (close enough to 965) can be found for free download at
http://machineknittingetc.com/brother-kh930-service-manual.html
Another source I found is a message on another board in July 2010 which discusses the importance of installing the belt correctly:
"The pattern belt has to be on the correct spikes of the wheel at the
pattern mechanism end, so when taking it apart move the belt so the
join is on the wheel and then mark the spot with Tipex or nail
varnish, then remove the old belt and replace the new one in the same
orientation and position.
The other wheel doesn't connect to anything so its position can be
disregarded.
If the belt is replaced wrongly the carriage runs along the bed just
before or after the wave of patterning information on the needles and
no pattern appears in the knitting.
Regards
Anne Croucher
Dorset, England."
I trust what Anne writes as she and her husband repair machines in England.