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Vibrograf B200 servicing and calibrating

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I am pondering servicing my Vibrograf B200.  It seems to be working now.  I figure I would replace electrolytic caps for sure.  I assume that it uses a crystal for its time reference.  There is probably a tuning cap to pull the crystal a few ppm one way or the other, so I would consider checking and adjusting. 

Not sure what else...the motor...?

Anybody serviced one of these?

Anybody have a schematic?

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