Fisher FVH-830 VCR problem
N3EVG
When the VCR is first turned on, the stop button LED flashes and no
functions work. After about 5 minutes, the light goes out and you can
play & rewind tapes fine--but when the stop button is pressed, the stop
light doesn't come on even though the tape will stop. Is this an
indication of a problem in the dew sensor circuit or a possible mpu
problem? Let me know what you think. Thanks, Bill
Frank Fendley
N> When the VCR is first turned on, the stop button LED flashes and no
N> functions work. After about 5 minutes, the light goes out and you can
N> play & rewind tapes fine--but when the stop button is pressed, the stop
N> light doesn't come on even though the tape will stop. Is this an
N> indication of a problem in the dew sensor circuit or a possible mpu
N> problem? Let me know what you think. Thanks, Bill
Probably neither. Have you changed the idler tire and the belts? With an
older Fisher, that is always first and foremost. Then see how it behaves.
Frank
Sam Goldwasser
> When the VCR is first turned on, the stop button LED flashes and no
> functions work. After about 5 minutes, the light goes out and you can
> play & rewind tapes fine--but when the stop button is pressed, the stop
> light doesn't come on even though the tape will stop. Is this an
> indication of a problem in the dew sensor circuit or a possible mpu
> problem? Let me know what you think. Thanks, Bill
Other possibilities: bad filter caps in power supply, bad connections,
other heat sensitive parts.
You should be able to confirm that the behavior is the same as a DEW sensor
indication by jumpering across the DEW sensor with a high value resistor
and/or disconnecting it - you should get the same indication with at least
one of these experiments.
--- sam
Stan Cramer
n3...@aol.com (N3EVG) wrote:
>When the VCR is first turned on, the stop button LED flashes and no
>functions work. After about 5 minutes, the light goes out and you can
>play & rewind tapes fine--but when the stop button is pressed, the stop
>light doesn't come on even though the tape will stop. Is this an
>indication of a problem in the dew sensor circuit or a possible mpu
>problem? Let me know what you think. Thanks, Bill
Greetings!
I am straining my memory on this problem and I can't locate my notes from
the last time I saw this problem. However, I think that I am on the right
track - so to speak. Check the large value capacitor located near the
the adjusting pots for setting the individual channels. This cap, maybe 1
whole farad, is the memory backup in case of short-term power outages.
When this cap goes flooey, I'm reasonably sure that the symptoms are as
you describe in your post.
I hope this helps. I wish that I could be more positive, but, at least,
my heart is in the right place.
Stan Cramer
Tomasz Urbaniec
In article <4p0s6u$k...@newsbf02.news.aol.com>, n3...@aol.com (N3EVG) wrote:
> When the VCR is first turned on, the stop button LED flashes and no
> functions work.
VCRs. They used a miniature bulb as the tape sensor's light source.
Flashing STOP LED and no other operation indicated an open circuit of
the bulb (most probably burnt bulb).
Hope this helps.
_______________________________________________________________________
Tomasz Urbaniec, M. Eng ## e-mail: <u...@polbox.com.pl>
Technological Skills of Poland ## Head Designer of the unique
Universal Multi-Purpose Semi-Automatic Wideband Party Noise Level Meter
Paul R Gendreau Jr
WRONG! In the Fisher VCR this is an indication that the DEW SENSOR is activated. Your dew sensor is
defective.
--== Paul ==--
--
Paul R Gendreau Jr TEL: 207-324-1634
The TV Man Inc FAX: 207-324-4752
Sanford, Maine email: tv...@biddeford.com
OUR WEB SITE IS AT http://www.biddeford.com/~tvman/home.html
Sam Goldwasser
> In article <4p0s6u$k...@newsbf02.news.aol.com>, n3...@aol.com (N3EVG) wrote:
> > When the VCR is first turned on, the stop button LED flashes and no
> > functions work.
> I can remember that symptom in some older types of Fisher FVH series
> VCRs. They used a miniature bulb as the tape sensor's light source.
> Flashing STOP LED and no other operation indicated an open circuit of
> the bulb (most probably burnt bulb).
> Hope this helps.
But he said in the remainder of the posting that after a few minutes,
it would play and record normally until stop was pressed, I think.
--- sam
.
Stan Cramer
Greetings!
I think that we are all forgetting that one of the symptoms when the
incandescent sensor bulb burns out is that the DEW light comes on forever
until replaced. The other symptom, of course is that the machine won't do
a damn thing!
I have a fair degree of confidence that the continual glow from the STOP
led means that the 1F display memory cap is shot. If this particular
machine will eventually turn on probably indicates that the cap does
finally fill up with e's and operate normally. I would replace the memory
cap first and see what happens.
Stan Cramer