Axial Adjustment Screw for Revox B 226? - diyAudio
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Old 6th December 2010, 06:15 PM   #1
walterh is offline walterh  Germany
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Default Axial Adjustment Screw for Revox B 226?

Hi out there,
I am running a Revox CD B226 since more than 20 years. Yes, people advice to throw it away but I hang on to it.

Recently the 226 refused to read CDs. After cleaning the optics and replacing the Capacitors I found out that putting some scotch tape UNDER the CD makes the machine work again.

So the bearing which holds the CD spindle at the proper height is worn out and the spindle has drille a little hole in the bearing - which is not more than a (teflon?) adjustment screw.

Does anybody know where to get a spare screw? The official dealers are out of stock as the machine is not produced any more since 15 years (at least).

Thanks for any advice!
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Old 7th December 2010, 05:44 AM   #2
poynton is offline poynton  United Kingdom
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Point one :- Don't throw it away , send it to me !!!!!!!

Point 2 :- which CDM is in your Revox? The CDM-4 or the CDM-1/II ?



Andy

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Old 7th December 2010, 09:31 AM   #3
walterh is offline walterh  Germany
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Hi Andy,
it ist the CDM 1. I already found the philips spare part number and the revox number.
Some service dealers advised to grind it down until it is all flat.

At the moment I am running the gear with a teflon disk right on top of the gear. It runs but the teflons bends because the magnet is pulling down the motor quite a bit.
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Old 7th December 2010, 01:23 PM   #4
poynton is offline poynton  United Kingdom
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It must be the cdm4 variety , then.

Check out the recent posts for CDM-4. CDM4/19 skips
They will tell you how to repair your Revox.


Andy


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Old 7th December 2010, 02:42 PM   #5
walterh is offline walterh  Germany
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Thanks for the link. However, I realy need that screw. For final adjustments I have the Revox Manual. The scope needed for adjustment I can borrow from somebody.
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Old 7th December 2010, 07:31 PM   #6
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I have never, ever needed to replace that thrust bearing 'screw'. All that's ever needed on these is a bit of added grease(sometimes) and simple turning in of the screw to compensate for the height lost by wear. So, just a 'turn of the screw' the right amount will fix the problem for the next decade or two, if done to the proper setting. This is best acheived by playing a cd(or cd-r even better) while observing the 'rf' or 'eye pattern' from the laser, and shooting for highest amplitude & clearest waveform on several different discs. Just don't forget to add a bit of glue as original to keep the thing from turning itself.
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Old 7th December 2010, 09:58 PM   #7
walterh is offline walterh  Germany
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Quote:
Originally Posted by stephensank View Post
So, just a 'turn of the screw' the right amount will fix the problem for the next decade or two, if done to the proper setting. This is best acheived by playing a cd(or cd-r even better) while observing the 'rf' or 'eye pattern' from the laser, and shooting for highest amplitude & clearest waveform on several different discs. Just don't forget to add a bit of glue as original to keep the thing from turning itself.
The problem with cranking the screw is that the already existing hole is off-axis. So turning the screw will shift the lower position of the axis. Together with the little hole there will be forces rectangular to the axis - increasing the wear on the upper bearing and tilting the CD as a whole.

If there was not that hole already your advice with the turning would be wonderful.
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Old 8th December 2010, 04:09 AM   #8
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It's not off center enough to matter, honestly. Just give it some thick grease & adjust it. It will work just fine.
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Old 8th December 2010, 07:29 AM   #9
Mooly is offline Mooly  United Kingdom
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I'd go with stephens advice, maybe remove the screw and polish flat with very fine abrasive paper, then use a good plastics/metal compatable grease.

Even the original Sony D50 discman had a similar adjustment.
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Old 8th December 2010, 10:53 AM   #10
walterh is offline walterh  Germany
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Maybe you are right one should not make a too big a problem out of it...

I found an instruction for re-doing the drive. The words are in German but the pictures are large and detailled. Note that they claim NOT to put lubrication either on the bottom point nor to the upper bearing close to the cd. I am not sure if I want to leave the lub away.

http://www.nanocamp.de/works/cd-antrieb/

I like the way they make sure that the bearing is flat.
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