Technics RS_TR252 twin cassette tape recorder

[rockinmark]

Hi I have a technics rs_tr252 twin cassette tape recorder it wouldn't rewind properly on the record deck side so I replaced the belts. I replaced them on both as I had it apart. Now on the record side it won't play without stopping after a couple of seconds in both direction I cleaned pinch roller. Has anyone any idea what is wrong. I haven't got repair sheets

Thanks mark

[cheerfulcharlie]

Just a thought but- you have cleaned the pinch roller,but have you also pulled out the capstan, cleaned that and make sure it spins freely on return?

[vinrads]

You need to find out how the auto stop works , sometimes it is a magnet on the counter, is the counter working / is there any wires adrift from the counter, a circuit would be helpful.Mick.

[rockinmark]

I clean the capstan and run freely. The counter works and I can't see any wires adrift. It plays sometimes for a little bit.

[TIMTAPE]

As it's a dual tape deck you have a working one to compare. Check that the take up reel is turning the tape in play.

[rockinmark]

If I don't have tape in and push to senser on to it works, only when tape in it stops I think. When I push play the capstan turn but tape doesn't then switches off

[ben]

This is a well-known failure on these decks. There is a plastic gear used for takeup (and possibly other winding, cannot recall).This goes brittle with age and loses teeth, giving rise to the symptoms you describe.

The part is NLA, so sadly there is no cure, until someone makes reliable replacements with 3D printers!

[rockinmark]

That would explain why it worked for a bit the switches off then Ben as it gets to cog at least one deck works in meantime I will look at it

[kevinaston1]

As Ben correctly states, the RDG5772ZC idler gear has a nasty habit of loosing its teeth.

I had one in from a customer a couple of months ago, and I had used our last gear wheel. I found this website at the time

https://www.shapeways.com/product/53...ic-rdg5772zc-r

which I offered to the customer, but stating I had never tried one, so I had no idea how good they are. Amazingly, the customer came in an hour later with two more TR252 decks - see if you can make one good one out of three, which I did.

If you need the service manual, I believe we have a copy in our files; PM me if you need it

[rockinmark]

Pm sent Kevin please could you send me a copy of the service manual can I swap the cog from the working not to the recording deck one