tascam 244 speed adjustment

[emillo]

Hi all, I recently acquired a 244. Belts and roller were in pretty bad shape but the rest was almost as new. I changed belts and pinch roller, and after a little struggle I ended up with a fairly stable transport. However, I'm playing tapes of various periods of my life, done with various recorders and its speed is faster than it should be, it plays almost a perfect semitone higher in the 0 position of the pitch control. I've been unable to find a service manual. Do you know how can I calibrate the speed for the 0 position?

thanks in advance