[Kenwood] Kenwood TS930 Power Supply Fan not turning on

Thu May 23 12:34:12 EDT 2013

There are many different flavors to this problem.
Terry and I have been on a back and forth "0ff-list".
We've gotten into more specifics such as access to power supply board, 
the plug for the thermistor/thermal switch, and how to deal with specifics.
His particular problem is that the thermistor/thermal switch has FAILED.
Same problem I had. I caught it BEFORE it began to cook the innards.
Really doesn't require a voltage regulator to be added. One CAN if that 
is their desire. The CPU fan I found to be more important, as it IS 
ball bearing design with 24/7/365 in mind.
It also draws less than half the full rating, current wise, than what is 
built-in.
Cheers!
Bob - N0DGN
On 5/23/2013 12:17 PM, Fortra wrote:
> Hi Gale,
>> this is what i have done on all of my Kenwoods..
> Put an small additional fan ( i guess CPU fan) on back of TS-850S, 
> TS-870S.
> On my TS-930S i have used an three terminal regulator for constantly 
> feeding
> 8,0 V dc to the original fan . Ir runs really "cool" ever since :)
>> Nermin S58DX
>>> ----- Original Message ----- From: "GALE STEWARD" <k3nd at yahoo.com>
> To: "Terry Clinard" <tclinard at hotmail.com>; <kenwood at mailman.qth.net>
> Sent: Thursday, May 23, 2013 5:38 PM
> Subject: Re: [Kenwood] Kenwood TS930 Power Supply Fan not turning on
>>> I had the same issue with one of my TS-850S radios. I modified both of 
> mine to have the fan run continuously. I installed an 8.0V, three 
> terminal regulator to run the fan on 8V. Nice and quiet and the radio 
> stays cool, even over an entire DX contest weekend.
>> 73, Stew K3ND
>>>>>> ________________________________
> From: Terry Clinard <tclinard at hotmail.com>
> To: "kenwood at mailman.qth.net" <kenwood at mailman.qth.net>
> Sent: Thursday, May 23, 2013 10:22 AM
> Subject: [Kenwood] Kenwood TS930 Power Supply Fan not turning on
>>> My TS930 power supply motor does not turn on. After about 45 minutes 
> operating SSB at 100 watts, I cannot touch the rear corner of the 
> cabinet at the power supply area, because it is to hot.
>> Is there a mod out there to fix the drive circuit or thermistor? OR 
> The schematic says the TS930 fan motor supply voltage is 10.3VDC. Was 
> thinking to disconnect the motor from the TS930 circuit and running a 
> 9VDC "wall wart" to the motor that would allow me to turn the fan on 
> separately when needed. Any thought form all you good folks?
>> Terry Clinard WA8OPR