[QuadList] ot Help with a Betamax Circuit Diagram

[Chill315 at aol.com]

T;here may be one on the transport that tells the tape is loaded.   Check 
to see if there are other sensors.
 
 
In a message dated 1/13/2012 8:43:47 A.M. Eastern Standard Time,  
dixie at westpoint.tv writes:

Hi  Dennis et All

I thought the same but I have checked the cassette  compartment and when I 
nsert the cassette it changes a voltage on the  relevant connector

David Dean
Westpoint Television
Archiving  Services
2" Quad , 1" B, 1"C, D1, D2, D3, D5, HDCam and HDV
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----- Original Message ----- 
From:  "Dennis Degan" <DennyD1 at verizon.net>
To: "Quad List"  <quadlist at quadvideotapegroup.com>
Sent: Friday, January 13, 2012  12:11 PM
Subject: Re: [QuadList] ot Help with a Betamax Circuit  Diagram


>
> On Jan 13, 2012, at 4:54 AM, David Dean  wrote:
>
> >Whilst everybody is talking about Circuit diagrams  I would be
> grateful for any help with a Sony Betamax SLO 420, The  machine will  not 
> load a cssette, if you wind the cassette  compartment by hand it  will 
then 
> load and play. I have checked  the compartment  and that is  seeing the 
> cassette but it is  not loading it. The fault appears to be  on the SS10 
> board, but  all I can see it do is go into a big square  chip and a 
little 
>  sub board !
> > Funilly enough it will eject the tape !
> >  Thanks for the bandwith
>
> I offer:
>
> David, before  you get too deep into circuitry, I'd suggest you check  
all 
>  mechanical trouble spots first.  Most of these problems are caused   by 
bad 
> microswitches, little actuators, or sensors that tell  the  electronics 
> what state the mechanical parts are in.   Often, these  sensing devices 
> fail or get out of alignment,  preventing the cassette  tray from 
loading, 
> for example.   I'll bet that there is a microswitch  inside that should 
be 
>  actuated when a cassette is loaded.  My guess is  that this  microswitch 
is 
> not working properly.  A tipoff is that you   indicated that the machine 
> will correctly eject the cassette.
>  Though electronics can fail, it is not first on the troubleshooting   
list.
>
> Dennis Degan, Video Editor-Consultant-Knowledge  Bank
>      NBC Today Show, New  York
>
>
>
>
>
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