pulsating fan noise in flex-6500

  • 1
  • Problem
  • Updated 2 years ago
  • Solved
I have a pulsating fan noise in my 6500.  It is constant from the time I turn the radio on.
I removed the cover and disconnected the large side fans.  It made no difference so the problem is clearly coming from the small internal fans.
The pulsating noise is the only problem other than driving me nuts listening to it all the time :).  It is the same sort of noise that you get from a twin engine aircraft with the props out of sync.  
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Gene - K3GC

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Posted 2 years ago

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Photo of Dan -- KC4GO

Dan -- KC4GO

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Suggest you contact the Help Desk... 
helpdesk.flexradio.com/hc/en-us/
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James Del Principe

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or sync the props......  
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Cal Spreitzer

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Gene I would contact the help desk.  I had the same problem with fan noise on my 6500.   After a trip back to Flex all is well.   I know how it can drive you nuts! 

Cal/N3CAL
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Brian Morgan VK7RR

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I have had the same problem with my 6500 since day 1. Sending the radio back to its birthplace is not so easy from VK  land. My "solution" was to put the radio on a foam mat. This reduces acoustic coupling and makes the noise much easier to put up with.
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Tim - W4TME, Customer Experience Manager

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Brian - the "pulsing" fan noise is indicative of one of the two CPU fans starting to malfunction.  It is either running at a lower speed that the other one or the speed is oscillating.  If the fan speed drops too low to cool the CPU properly, the radio will throw a thermal error and shut down the radio as a protection mechanism.  If you get these errors, even if they go away on a subsequent restart, you should have the radio serviced.
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Norm - W7CK

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If it is just one of the fans, can't he just get another and throw it in himself?
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Tim - W4TME, Customer Experience Manager

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No.  The CPU fans are not user serviceable.  Attempting to do so will void the radio's hardware warranty.
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Brian Morgan VK7RR

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Thanks Tim. As I said in my original post, it has been like that since day 1. It was about day 1.2 when I put the foam underneath it. I appreciate your warning. Knock on wood I have not had y warning.
Brian
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Tim - W4TME, Customer Experience Manager

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RRR. 

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