VHS tape plays for a few seconds and automatically ejects

You can only compensate for minor scratches. As for the vcr side the rollers could be dirty or the brake worn out. The tensioner may be too sensitive as well. Basically the mechanism probably needs servicing.

Take dvd/vcr combo aparts.Turn on the power to the machine,one hand move around the inter eject vcr port for those sensors,the other hand just keep pushing the eject button,keep doing this until the tape eject and come out.

This sounds like a mode switch problem. It may need to be replaced.

The VCR is not turning the TV power off. The tape is not playing. I'd guess maybe it needs a cleaning or a replacment.

can't get the SV2000 dvd/vcr to record

I told you in premium post that Unplug your Combo for 5 - 10 minutes from AC outlet and replug it. Now push eject button and take out cassette.

THERE IS A SENSOR SWITCH THAT TELLS THE MACHINE THE TAPE IS LOADED ... SOUNDS LIKE IT IS STUCK. PROBLEM IS ACCESS WITH COMBO'S. THEY ARE A PAIN TO GET AT. THE WHOLE BACK COVER TO THE TV MOST OF THE TIME HAS TO BE REMOVED,... I KNOW ITS NOT MUCH HELP BUT THE MANUFACTURES KNOW THAT... HOPE YOU CAN GET TO THE TRAY INSIDE. Joe_Rex

It sounds to me like you have a problem with the reel sensors not detecting movement of the tape through the VCR. This could also be caused by a defective voltage regulator(s) that powers the sensors. This model was made by symphonic/funai (1-800-242-7158), and it is not likely worth repairing.

if all you want to do is disable the vcr portion turn the set on , install a blank vhs tape it has to be blank or the vcr will try to read it .and the tv and dvd should work fine. this is a timing problem in the vcr deck its not hard to fix but it is a pain.