If you have an electronic device that is in need of some repair, and you're willing to do the repair yourself, use this forum for advice from other electronics experts.
Picked this up used so I can send G-parents video's of great grandson. No dvd player in the house.
This looks to be a good Sony build worth repair. I have replaced the left threading gear (373614701). Not sure the name but right side spring arm was gummed up. (Puts tape in front of read head) Removed lubed plays great.
I need advise on what to look for or do for the rewind.
Think I fixed it. When I replaced the threading gear a misalignment occurred. Sorry I don't know the names of the parts for others that run into this, but the wide flat piece needed to be all the way to the right I was 3-4 teeth off. Must have bumped it trying to line up the large round gear.
Most of the critical gears (for alignment purposes) have either holes in them that line up with holes in the chassis or other parts; or have small arrows that line up with other arrows. Alignment is pretty intuitive on this mechanism.
Aligning the RVS arm: You use a small mirror and watch the tape in forward mode for no curl. (between the capstan shaft and RVS arm post) The actual adjustment is made in scan reverse mode so that the tape does not curl against posts. (between the head and capstan shaft) Again you need a small (dental) mirror to get a close look.
I have some precision plates that get real close but you still need to do the visual alignment.
If the RVS arm seems hard or impossible to get adjusted for no curling on both forward and reverse modes then the capstan motor bearing may be bent. This can be accompanied by scraping noises, especially after warmup. The bearing shaft is available as a seperate part fairly cheaply.
Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now.
zaphod7501 wrote:Most of the critical gears (for alignment purposes) have either holes in them that line up with holes in the chassis or other parts; or have small arrows that line up with other arrows. Alignment is pretty intuitive on this mechanism.
Aligning the RVS arm: You use a small mirror and watch the tape in forward mode for no curl. (between the capstan shaft and RVS arm post) The actual adjustment is made in scan reverse mode so that the tape does not curl against posts. (between the head and capstan shaft) Again you need a small (dental) mirror to get a close look.
I have some precision plates that get real close but you still need to do the visual alignment.
If the RVS arm seems hard or impossible to get adjusted for no curling on both forward and reverse modes then the capstan motor bearing may be bent. This can be accompanied by scraping noises, especially after warm up. The bearing shaft is available as a separate part fairly cheaply.
I need advise on what to look for or do for the rewind. 
Working: Play, Rec, and Fwd