Re: Anyone technically familiar with the Sony Beta SL-2000?

From: LASERandDVDfan (laseranddvdfan_at_aol.com)
Date: 01/02/05 

Date: 02 Jan 2005 02:28:11 GMT

>The fact that you have an SL-2500 which did the same thing is somewhat
>reassuring. At least it suggests that this might be a well known
>problem (at least to someone) and that there might be a known cause
>and solution out there.

The SL-2000, SL-2500, and SL-2700 essentially share the same platform, although
the SL-2000 is a portable top loader while the other two are relatively high
end front loaders, particularly the Hi-Fi SL-2700.

They all use a dual motor drive for the spools as opposed to a single motor
pendulum configuration.

Not many models used this configuration because of the expense.

>Forgive me, but I don't understand how extra friction in the upper
>head drum could cause this symptom. [Doesn't the upper part spin? I
>thought the lower part was stationary....]

Both parts of the drum do not rotate. Only the inner head disc rotates. But,
grime buildup on the drum surfaces can cause excessive drag, which may cause
problems with the tape travel.

Another thing you can do is to check the condition of the threading mechanism
drive belt, which should be to the upper right of the drum. If the belt is
worn, replace it and see what happens.

Also check the condition of any and all braking materials on the spool drivers.

>The problem with this is that these are not just simple DC motors;
>they are brushless (stepper?) motors, so I think it will take some
>careful scope measurements to compare their inputs.

They are servo controlled brushless motors with servo feedback provided by a
magnetic sensor. - Reinhart

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