[Kenwood] TS-940S Cooling Fan Problem

[Walt Breining]

What happens if you hook it to a good 12v DC supply, not a wall wart?  Walt
N9WB
----- Original Message ----- 
From: "Bill Stewart" <bstewart at ipass.net>
To: "Walt Breining" <n9wb at nltc.net>
Cc: "kenwood at mailman.qth.net" <Kenwood at mailman.qth.net>
Sent: Friday, October 28, 2005 12:57 PM
Subject: Re: [Kenwood] TS-940S Cooling Fan Problem


> Walt, its a 12vdc motor...Bill
> ----- Original Message ----- 
> From: "Walt Breining" <n9wb at nltc.net>
> To: "Bill Stewart" <bstewart at ipass.net>
> Sent: Friday, October 28, 2005 10:53 AM
> Subject: Re: [Kenwood] TS-940S Cooling Fan Problem
>
>
> > How many volts is the fan made for? I am wondering if it is driven by a
> > transistor that is badN9WB
> > ----- Original Message ----- 
> > From: "Bill Stewart" <bstewart at ipass.net>
> > To: "Walt Breining" <n9wb at nltc.net>
> > Cc: "kenwood at mailman.qth.net" <>
> > Sent: Friday, October 28, 2005 9:29 AM
> > Subject: Re: [Kenwood] TS-940S Cooling Fan Problem
> >
> >
> >> Thanks Walt for the reply...
> >> I would say for the fan to reliability start every time, it needs at
> >> least
> >> 1.5vdc, maybe a tad more. Sometimes it will try to start at a slightly
> > lower
> >> voltage. Once the voltage gets beyond 1.5 or so, it runs & starts fine.
> >> It
> >> draws around 80ma or so when its trying to start. That's probably why
the
> >> voltage drops from a no-load value of around 18vdc.
> >>
> >> Thanks to all for the other comments. I think the the prudent thing to
do
> > is
> >> can this fan. I got to thinking about replacing it with a small 120vac
> >> muffin fan mounted to the existing fan cage. On my power trans. there
> > seems
> >> to be two 120v primary windings. I was thinking about hooking the
muffin
> > fan
> >> to the 120v side and let it run all the time (with the unit turned on).
> > I'm
> >> not sure how much current the fan would pull or how much headroom there
> >> is
> >> on the fuse. A dropping resistor could be used to slow it down if
needed.
> > At
> >> least I could hear it running...and as Tim the Tool Man says....MORE
> >> POWER...uuuGGGGHHHHH......de Bill Stewart K4JYS
> >> ----- Original Message ----- 
> >> From: "Walt Breining" <n9wb at nltc.net>
> >> To: "Bill Stewart" <bstewart at ipass.net>; <kenwood at mailman.qth.net>
> >> Sent: Thursday, October 27, 2005 8:12 PM
> >> Subject: Re: [Kenwood] TS-940S Cooling Fan Problem
> >>
> >>
> >> > Bill:
> >> > You said that you tried it on another DC supply? Did it run ok or did
> >> > it
> >> > still start slow?
> >> > If it still started slow, it probably is the fan.
> >> > If it starts ok on a good DC supply, there could be a problem with
the
> >> > circuitry that powers the fan.
> >> >
> >> > Vy 73, Walt N9WB
> >> > Good audio is an Amateur Radio tradition, not a crime.
> >> >
> >> > ----- Original Message ----- 
> >> > From: "Bill Stewart" <bstewart at ipass.net>
> >> > To: "kenwood at mailman.qth.net" <Kenwood at mailman.qth.net>
> >> > Sent: Thursday, October 27, 2005 8:25 AM
> >> > Subject: [Kenwood] TS-940S Cooling Fan Problem
> >> >
> >> >
> >> >> I have a TS-940S, s/n 6040XXX, which has a sluggish cooling fan (on
> > left,
> >> > facing front, behind the power trans.). Sometimes it will not start.
I
> >> > have
> >> > shot WD-40 in it and tried to get oil to go down the shaft but
> >> > sometimes
> >> > it
> >> > still won't start and if it does start, it turns slowly &
erratically.
> >> > I
> >> > measured the voltage to be around 18VDC with the fan disconnected and
> >> > connected, a fluctuating .5 to 1.5VDC with the erratic rotation.
> >> >> Questions: 1. Is this no-load to load voltage drop normal?
> >> >>                  2. Does the voltage and fan speed increase with
temp.
> >> > rise?
> >> >>                  3. If the above is a problem, are there any mods.
to
> >> > replace this fan or maybe make the fan run all the time?
> >> >> The fan runs ok if it gets beyond the low start-up point (on a
> >> >> seperate
> >> >> DC
> >> > supply).
> >> >> Any comments will be appreciated, thanks...Bill K4JYS
> >> >> ______________________________________________________________
> >> >>
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> >
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