VCR powers off after 12-15 seconds

[Mike Shullaw]

Sounds like the tape end sensor LED. Very common problem. It sets under the
prism in the middle of the transport, right between the tape reels. The MCM
part number is 25-480.

<jay...@my-deja.com> wrote in message news:84har7$msg$1...@nnrp1.deja.com...
> Four vcrs in my shop exhibit essentially the same faults; i.e., all
> function normlly except that they shut off automatically about 12 to 15
> seconds after play begins. Same with dummy cassette. I spin supply reel
> by hand (the type with rotor spokes) but no effect. I don't have
> circuit diagrams nor much in the way of test equipment. The vcr's are:
> Philips VRX222AT02, VRX222AT22, VRX364AT01 and LX1 934.55157790.
> I sure would appreciate being pointed in the right direction.
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.

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

[Sam Goldwasser]

Reel sensor if the tape counter doesn't change when the reels are turning.
Dirty or bad.

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

You're right, the vcr's behave exactly as if they reached the end of the
tape. I was (mistakenly) thinking it was the reel sensor on the supply
side. I'll try the sensor and let you know. Again, thanks very much.
Jake
In article <s6ojq0...@corp.supernews.com>,

"Mike Shullaw" <mdsh...@cornhusker.net> wrote:
> Sounds like the tape end sensor LED. Very common problem. It sets
under the
> prism in the middle of the transport, right between the tape reels.
The MCM
> part number is 25-480.
>
> <jay...@my-deja.com> wrote in message
news:84har7$msg$1...@nnrp1.deja.com...

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

I'm pretty sure the tape counter indicates activity on all of them; when
I get to the shop I'll verify yeh or nay then proceed as you suggested.
I do remember an ingenious arrangement of light conductors/prisms
incorporated in an acrylic casting. Lots of smarts in the vcr's today.
Too bad they are so fragile. Again, thanks for your advice.
Jake

In article <SAM.99De...@colossus.stdavids.marconimed.com>,

s...@stdavids.marconimed.com (Sam Goldwasser) wrote:
> Reel sensor if the tape counter doesn't change when the reels are
turning.
> Dirty or bad.
>
> --- sam | Sci.Electronics.Repair FAQ Home Page:
http://www.repairfaq.org/
> Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
> +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
> | Mirror Site Info:
http://www.repairfaq.org/REPAIR/F_mirror.html
>
> Note: The Plop server may be down during the holiday break. Please
use one
> of the other mirror sites or link through repairfaq.org. Thanks.
>
> In article <84har7$msg$1...@nnrp1.deja.com> jay...@my-deja.com writes:
>

[FarberBear]

>Subject: Re: VCR powers off after 12-15 seconds
>From: jay...@my-deja.com
>Date: Fri, 31 December 1999 01:52 PM EST
>Message-id: <84it91$o02$1...@nnrp1.deja.com>

I had a Philips machine with the same problem. The tape would play about 10
seconds. The counter would count the time correctly. Then, it would go to stop
mode. I noticed a lot of previous posts in deja.com about the fault. However
changing the tape end sensor LED didn't correct the fault. Resoldering the
connections to the receiving photo transistors did fix it.

Good luck.
David Farber
David Farber's Service Center
L.A., CA

[gi...@texas.net]

On Fri, 31 Dec 1999 04:31:04 GMT, jay...@my-deja.com wrote:
also ck the alignment of the two prisms and clean them
if the alignment is off simply break the index tits off the large
prism, align it with the small one, and tighten the screw down