HP-23C schematic??

[Garey Barrell]

Bob Burns wrote:
>  
>  
> In a message dated 30/04/2009 13:51:53 GMT Standard Time, ac1y at NC.RR.COM  
> writes:
>
>
> Basically, someone detached the Fil Common wire and left it  floating (taped
> off) inside the chassis. I'd rather presume that this  should be grounded,
> right??
>
>
>
>
> Hi Sandy
>  
>
> Wrong! None of the filament connections are grounded in the power supply,  
> only in the destination transceiver, in order to avoid hum loops in the  
> interconnecting cables.
>  
>
> On the assumption that all of the HP23x units have basically the same  
> connections, the HP23A has the filament centre tap connected to pin 8 of the 11  
> way socket and labelled 6v FIL. As far as I can see, if a function is 
> missing  then that pin is left disconnected.
>  
> I too have an incomplete HP23C manual, missing its circuit diagram.
>  
> 73
>
> Bob 
>
> G3OOU
> G-QRP  6907
> _www.g3oou.co.uk_ (http://www.g3oou.co.uk/) 
>   



The HP-23C filament wiring is 12.6 VAC only.  The Yellow wire goes to 
Pin 2 of the connector, and Green/Yellow goes to Pin 6.

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>

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