Looking for schematic for a Sencore VA62

[Red Raster]

Hi i have just acquired a VA62 tv / vcr analyst and am getting some compression on any one of the video patterns comming out of the vcr standard output but no compression on the drive output. this should be easy to trouble shoot with a scope and a diagram, These things are getting so throw away cheap ($125. on ebay) how much time can i justify using my Tektronics 2246 that's probably worth a whopping $200. on a good day.