Differences between version 4 and predecessor to the previous major change of HowToRebuildTheVibratoScanner.

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Newer page: version 4 Last edited on May 24, 2006 10:09 am. by
Older page: version 3 Last edited on May 2, 2006 6:29 pm. by
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 Also, please see the Hammond Technical Service Bulletin 
 on ''Repair & Disassembly of Vibrato Scanners'' at http://www.dairiki.org/hammond/vibrato_tsb/. 
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+Note: To rebuild the drum-type scanners attached to the motor by a belt (not mounted to the end of the motor) such as those found in the T series, see [HowToRebuildTheDrumVibratoScanner].  
  
 The following was submitted by BobSchleicher to the OriginalHammondLeslieFaq. 
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 The presence of a motorboating or chopping sound in the [Vibrato] can be an indication that one or more pole pieces of the [Scanner] have been shorted out. The likely culprit is a crystalline growth that can occur on the plated and metal composing the scanner housing (ZincDendrites). This shows up as conductive whiskers or dust between the scanner body and the poles of the scanner. High humidity and temperature is said to aggravate dendrite formation. An over-oiled scanner can also cause vibrato motorboating, though it is probably an aggravating condition to the dendrite formation. The oil coats the insulators and picks up and retains conductive dust and debris, shorting out the stators. 

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