[Kenwood] TS-940SAT fan help

[Avi - Modi'im Orchards]

Why not just lube the bearings on the original fan? every PS or computer fan 
I've ever had a problem with could be fixed by pulling the sticker off the 
housing and putting a drop of light oil or turbine oil in there, or if that 
doesn't give you access to the bearing, pull the blade assembly off the 
motor shaft and lube it that way.  I think you probably have the same fan in 
your 940 that I have in my PS-50 that goes with my TS440, and that's how I 
(periodically) fix it.

-avi 4X6UA

----- Original Message ----- 
From: "Garey Barrell" <k4oah at mindspring.com>
To: "joe barkley" <jbarkley at vnet.net>
Cc: <Kenwood at mailman.qth.net>
Sent: Tuesday, November 07, 2006 00:00
Subject: Re: [Kenwood] TS-940SAT fan help


> Joe -
>
> What's probably happening to your fan is that the voltage is supplied from 
> the 30V supply through a 820 ohm resistor, and your fan draws too much 
> current, dropping the voltage too low to start.  If you give it a spin by 
> hand it will probably run.   This is a fairly common failure mode of the 
> Kenwood fan, the bearings get gummed up and the  _start_ current drops the 
> voltage too low to start it.
> So....  You can either change the resistor on the PS board to a lower 
> value, or you can do what I did to a 940 when I couldn't find a 
> replacement fan for less than $30+ from Kenwood.  If you put a 22V zener 
> diode across the resistor, at least 8 volts is supplied to the fan at 
> startup.  Once the fan starts, the current drops enough that the voltage 
> across the resistor drops below 20V and the zener no longer conducts.
> Whatever you do, you DON'T want the fan to NOT come on.  The internal 
> temperature, especially on the PS board, rises enough to damage several 
> components and cause catastrophic damage.
>
> The Kenwood fans show up on E* from time to time as the "ship breakers" 
> are tearing up working units to sell for parts, since like cars, they 
> bring more money as parts.!
>
> 73, Garey - K4OAH
> Atlanta
>
> Drake 2-B, 4-B & C-Line Service CDs
> <www.k4oah.com>
>
>
>
> joe barkley wrote:
>> I have a very noisey fan on the power supply heat sink.
>> I have looked for it and put a couple ads out and no luck finding one.
>> I thought I could ad a 2.5 inch 12v dc fan on the back. I founf one and 
>> got it hooked up to find
>> when the thermal switch kicks in the is 18.3 Vdc. The 12V I have does not 
>> like that and will not operate.
>> It does fine on 12V. First, does anybody have a fan froma parted out 940 
>> and second
>> how can I get that 18 V down to when this fan will go for it.
>> Thanks
>> Joe
>> KI4TZ
>>
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