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Agilent 34410A Noisy fan

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jstarr:
I just bought this from Ebay and it works beautifully but the fan is noisy and the speed (by its sound) appear somewhat irregular.  Oddly, if I put one of my fingers partly over the intake (about 1/4 of the intake) the fan speed and sound becomes quiet and regular.  Any suggestions or should this be my first Tear Down !!

john

engineer_in_shorts:
Bearings?

LA7SJA:
The 34410-68502 (replaced bye 34410-68503) Assembly-Fan should be replaced.

http://www.home.agilent.com/myagilent/faces/partDetail.jspx?partNumber=34410-68503&imageStatus=YES

JFG

HighVoltage:
I have installed low noise Papst fans in almost all my instruments that made too much noise.
Papst makes them with internal thermistors on a little cable and you can place this sensor on the most heated part of the
instrument (heatsink) and the airflow will increase when needed. I have been doing this for years and never had any heat
problems with any Agilent instruments


 

engineer_in_shorts:

--- Quote from: HighVoltage on July 26, 2014, 08:46:02 am ---I have installed low noise Papst fans in almost all my instruments that made too much noise.
Papst makes them with internal thermistors on a little cable and you can place this sensor on the most heated part of the
instrument (heatsink) and the airflow will increase when needed. I have been doing this for years and never had any heat
problems with any Agilent instruments

--- End quote ---

Hi,
I am interested in these.  Do you have some part numbers or links to these products?

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