Repair / Help Forum > Repair / Help

SANSUI FR 4060 running half step fast

(1/4) > >>

EmperorNorton:
Hey folks

Bought a new 23.6"belt for this Sansui turntable I found  few months back.  Put a few drops of oil in the tube under the platter and its runs very nicely apart from the fact that it plays a half step fast.  I played Ella and Louis 'April in Paris' on CD which is in B flat but when I play the LP it in B.  Probably not noticeable to 95% of the population but I'd like to sell it as 100% perfect.

One person I read online said that making the platter a little bigger with DymoTape (which might be scrce these days) would do the trick. Might just try a couple layers of all purpose duct tape.   

Any thoughts from the turntable gurus?

Thanks in advance.

Mike

Sir Thrift-a-Lot:
In theory that should work, but in practice I hate it as a "solution" (FWIW, I'm no guru).   I would think that the motor has something in the circuit which is drifting out of spec.   If that's the case, you may end up adding tape every few months as it continues to drift until it finally fails.   If it were me, I would start with recapping the power supply then doing whatever the manual says to fine tune the speed.   I would be very surprised if there isn't a a trim pot somewhere on the power supply.

Is it off in 45 RPM as well or just 33?   That may help to narrow down the issue.

I just checked, there is a service manual on VE.

EmperorNorton:
Its slightly off at 45 also.

I have read that there are not speed adjustments on his model.   

there is  slight chance the belt is too wide but, while it is obviously not a long term permanent fix,  I am planning to sell it and don't want to invest any money into it by taking it to Vince for(possible) repair.  If it is an issue with the belt and not the motor,  I'd reckon adding a bit of very hard material, like the DYMO Tape mentioned in one of the forums I read, would last a long long time.   Duct tape, probably not so much.

I suppose I can sell it as-is, giving the buyer  heads up about the speed issue, obviously.

Decisions, decisions....

scorpio333:
I took a look at the service manual...it it 90% about the automatic arm movement. In the troubleshooting section:

Problem: Incorrect speed
What to do:
Improper capstan
Improper setting of capstan
Dirty capstan
Stretched belt

You could try and clean the capstan, but in my opinion it's the belt. The correct belt is likely unobtanium in the exact tolerances it needs to be. This is likely why the tape on the spindle is the best available fix. While it's not the most elegant fix, if it were mine I'd add the tape.

rgpit:
According to the specs it has a synchronous motor so the speed should be controlled by the 60Hz 120 VAC input. If it is set for European 50Hz frequency it would run fast being powered by 120VAC 60Hz. Check and set if it can be re-wired or switched to 60Hz setting.

I think putting tape on the platter is a bad idea. It will add a lot of wow and flutter to the output signal.

Navigation

[0] Message Index

[#] Next page