[Kenwood] TS-850 Audible Whine

[rbethman]

Yes, however, as has been stated by the OWNER - sometimes his Kenwood 
Power Supply Built-in Fan DOES come on.

It doesn't hurt to READ all the messages.

N0DGN

On 3/10/2013 7:32 PM, GALE STEWARD wrote:
>
> It indeed could be the fan, however the TS-850S has only one fan (for the final amplifier section). There is no power supply fan as the radio uses an outboard 12VDC supply. The 930/940 had two fans and a built in power supply.
>
> 73, Stew K3ND
>
>
>
>   
>
>
> ________________________________
>   From: rbethman <rbethman at comcast.net>
> To: kenwood at mailman.qth.net
> Sent: Sunday, March 10, 2013 5:21 PM
> Subject: Re: [Kenwood] TS-850 Audible Whine
>   
> This would most likely be the power supply fan.
>
> They were either made by Panasonic or Matshusta.  These are bushing
> motors.  Toss them!
>
> Do yourself a favor.  Open the back up, and wire in a 12VDC Computer
> Ball Bearing CPU fan.
>
> Not only will the whine stop, but you can easily drop the running
> current by half or more.
>
> Did this to my TS-930SAT.  Cools well, and quiet as a mouse. Takes less
> to run, thereby drops the 12VDC power bus load.
>
> Bob - N0DGN
>
> On 3/10/2013 4:56 PM, Mark Nace wrote:
>> Hello,
>> I have a 15+ year old TS-850 that still works well, but about 3 months ago, when
>> I key the rig, whether or not it is transmitting any power whatsoever, and even
>> when the ant. tuner is in action, I get an audible whirring sound from the back
>> of the unit.  Happens on all band positions and modes.  I have asked about my
>> signal quality and get good reports, and full output.
>>
>>
>> Could this be the fan inside the unit making that noise, or something more
>> sinister going on?
>>
>> Many thanks!
>> 73
>> Mark
>> N5KAE
>>