Dew sensor on VCR

[Sofie]

The problem may not be the dew sensor but the support circuitry instead. In
most circuit designs with dew sensors, it is ON (moisture detected) at about
450 ohms or higher............and it is OFF (dry) at about 450 ohms or less.
Try bridging a 100 ohm resistor across the terminals to see if the light
goes out......if not, the problem is not the dew sensor, but the circuitry
it interfaces with.
Best Regards,
Dan Sofie
Electronics Supply & Repair
==============================================

craig osborn <ee...@worldnet.att.net> wrote in message
news:tlkZ4.2588$pk3.1...@bgtnsc04-news.ops.worldnet.att.net...
> usually found around area of video head be carefull some types dont like
to
> be cleaned and usually require replacement.
>
> <ld...@my-deja.com> wrote in message news:8h4flq$482$1...@nnrp1.deja.com...
> > Make: Montgomery Wards
> > Model JSJ 10551
> > This is a very old VCR, (has a varactor tuner) The dew light is
> > constantly on. I am trying to fix this for a friend who cannot afford
> > a new VCR. Can anyone tell me where to find this sensor so I can clean
> > it. Perhaps a dirty sensor is not the problem. Aby ideas?
> >
> > Thanks
> >
> >
> > Sent via Deja.com http://www.deja.com/
> > Before you buy.
>
>

[ld...@my-deja.com]

[craig osborn]

usually found around area of video head be carefull some types dont like to
be cleaned and usually require replacement.

<ld...@my-deja.com> wrote in message news:8h4flq$482$1...@nnrp1.deja.com...

[Mark D. Zacharias]

The dew sensor is about 1/2 the size a postage stamp, grey or light-brown in
color, and has 2 wires attached. It's usually on the drum or just attached
to the chassis somewhere. Often just disconnecting it works - how often do
these things really get damp inside anyway? New models have deleted this
part anyway.

Mark Z.

[Da Man]

Well if they are brought in from the cold, the moisture will condense on the
head. It does not take much moisture to allow a tape, especially the super
thin ones to make a awful mess of the tape. That's why the head heaters are
their along with moisture sensors. New models may have just put a warning on
them, like "Do not use until the unit warms up", or a bigger heater, or a
thirmister connected to the microprocessor, that allows a warm up period
before the unit fully turns on.

Jeff

"Mark D. Zacharias" <mzach...@kscable.com> wrote in message
news:qesZ4.13196$t63....@typhoon.kc.rr.com...