hifi engine

Akai GX-F66RC Service Manual

Looking for a Service Manual for a Akai GX-F66RC
The deck plays fine until it runs for about 60 sec then shuts off when the digital counter stops. I checked the little belt that runs the photo/wheel looks ok. Anyone have any ideas?
When I got the deck the casptian arms were frozen. Lubed them now all's fine except this issue.