[QuadList] ot Help with a Betamax Circuit Diagram

[David Dean]

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
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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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