IT PLAYS TAPES SLOW

Sounds like its mechanism need some alignment. Guide pole alignment. Contact any service technician. This is technically skilled work. http://electronicshelponline.blogspot.com/

If by "off track" you mean it cannot track an image on the tape, it may just need cleaning. The heads, head drums, guides, and rollers in the playback mechanism require cleaning on a regular basis and, if they are not cleaned regularly, oxide particles and dirt accumulate to the point that the VCR is no longer able to play tapes.
Although automatic head cleaners are available, they're more for maintenance, and if it isn't playing tapes anymore it's beyond that. I would recommend taking the VCR to a repair shop for cleaning... shouldn't cost very much, and it should solve your problem. (Let's hope that the heads aren't worn down... bit more of an issue.... but try the cleaning first.)
Once you have the unit running again, buy an automatic cleaning tape and use it every few plays.

Try disconnecting the battery negative and positive cables. The radio has a constant hot wire which keeps the memory alive on the radio. This constant wire always has power to the radio so you have to disconnect the (+) for at least 2 minutes, which should clear out the memory on the radio and hopefully it'll stop saying clean player. If it comes back on when you hook the battery back up then look up the radio brand and model number on line and do a search for a way to clear it from the radio.

This may be caused by a faulty adapter. 1. try playing in the camera. 2. try a different tape. 3. try a different adapter.99% this is a problem with the adapter or the tape. It really sounds like the tape isn't turning freely, which can be caused by a brake sticking, or spindle in the tape or adapter.

no picture after clean up head

If recently recorded plays back ok, and there's no warning about low rf or head clogging problems,it seems to be electronic problem in vtr board,but usually is head problem,which is not so expensive.

The only thing you can do is take the tape out of the cassette and place it in a modern cassette case. Just buy new blank tapes and discard the new tape inside. If that doesn't work and it's not your player causing the problem then it's due to the tape itself.

try forwarding the tape to the end and then rewind to the start again, this can help to seat the tape correctly on the spindle . the audio track part of the tape is in a specific region on the tape so misalignment may be the issue with those cassettes.

also try to press the tracking up and down when playing the video

capstan belt may be failing. check this by removing lid and touch the capstan flywheel when running. if it is easily stalled/slow to come up to speed and or the belt slipping badly then belt will require replacement.

perhaps it has to do with the SP and LP settings, I know certain video editing programs won't capture video recored in LP.