Pioneer RT-707 speed problem only in REC mode

[Laur Niculae]

Hi all,

I have a very strange problem... in playback it works perfectly, on a 3 kHz test tape there is no speed fluctuation. However,when I record the same tone, there's a noticeable wow and flutter effect

So far, I've done everything suggested in the forums: cleaned the Molex connectors, the three trimmers on the control board, all contacts and the pitch potentiometer. The pressure roller is clean, and the brakes seem fine (haven't measured the torque yet)

What I observed yesterday is that the capstan shaft has an axial play of 3 mm and a radial play of 1 mm. This could be the cause, but why does it only occur during recording and not during playback?

I'm from Romania, and there aren't many Pioneer techs here. Most people have Revox or Akai decks. Any help would be greatly appreciated!

 

[radiokom]

capstan shaft has an axial play of 3 mm and a radial play of 1 mm

It is not "play", it is FUBAR. It is damaged.

 

[Laur Niculae]

)
I reduce the tension on the pinch roller and is better but still audible.. Do I need to find a replacement, or can it be repaired? Is it possible to replace the bearings or bushings?

 

[radiokom]

Capstan is damaged. Find spare part, service and replace. Remove and inspect motor first. If you are not familiar with that, better find technician. It can not be "perfect" in playback, simply in recording mode w&f can double, because your recording is made with high w&f. It is not because of pinch roller, but capstan. Hard to imagine how capstan has that play.