Sony slv 715ub no stereo sound on tape playback

This problem is often caused by the tape bunching up underneath the flap. Press down on the small release button on the side of the VCR machine and then lift up on the flap.

The only real cure will be to clean the video head. If that doesn't work then I'm afraid that whatever recorded you EP mode tape was not set up well tracking wise. So other machines struggle to track the tape. Some VCR's will only playback SP or LP tapes and don't have EP mode. In which case you should check to see if these VCR's can play the EP tape and if they can't find one that can.

The problem is the idler assembly or the black square belt that drives it, this will cause the vcr to shutdown preventing tape transport. The vcr will need to be dismantled for repair, I recommend a tv technician to check your machine with an estimate.

Take cover off and turn the loading motor until it come out.

As JSE suggested.
Also dump any very old tapes.
As you say some play perfectly, I suspect, from personal experience, that faulty ones are either very old, or if recorded on another machine, may be mismatched with your current player.

While the tape may appear to be loading properly, it is not. These units have a known problem with the grease at the loading arm getting sticky. This means that the tape is not loaded properly and will not move through the VCR properly. This is detected as the hubs not moving and the unit will eject the tape to prevent damage. This is a simple repair for anyone that has done these before, but requires an alignment check. This check requires a special alignment tape and equipment.

This should be a labor only repair.

Dan

Sounds like you have a head-clog. You can purchase a VHS Head Cleaner at Radio Shack for $5.00. If that doesn't work repairing your VCR is not cost effective when you consider that you can purchase a new VHS/DVD combo deck for under $125.00

If this unit is 4-7 years old then TOSS it. As time goes by the rubber gets soft and the units timing gets whacked. Repair will be more than what it's worth , unless your emotionally attached to it ...

Please rate!

It sounds like the taped program was recorded on a different speed. The other VCR that you are playing the taped program may not have the speed needed to play it correctly.
Next time when you record a program try to make sure you use a speed that will be compatible on both VCRs.
For example a tape that last 120 minutes, using the different speeds will give the following recording times.
SP means "Standard Play" >>>> 2 hours
LP means " Long Play" >>>>> 4 hours
ELP means " Extra Long Play" 8 hours

Older VCRs have all the 3 speeds but newer ones only have SP and ELP.
Hope this helps.

1st try a different tape.
If it's the same, listen carefully for unusual noises, clunks, grinding, etc. when the tape goes in. Is something binding?

With the tape out, look inside the door, see if you can spot anything in there that shouldnt be there such as a small toy, money, playing card, sandwich, bits of food? Those are the usuals.

Turn the vcr upside down and holding the tape door open, tilt it so if there was a foreign object in there, it would fall out.