[Premium-Rx] WJ-8718-9 Preselector.

[lrlayton at cox.net]

I think I have the secret ... took the bottom cover off of my WJ-8716 and 
discovered a ribbon cable type jumper between A6J1 and the PRE XA2 jacks. This 
would be needed for the 796002 card to work.  Can send a photo to others interested

Regards, 
Les 

---- lrlayton at cox.net wrote: 
> David, 
>  
> On my WJ- 8716 with the PRE option,  the preselector decode card (796002) is 
> located in the front center jack on the I/O motherboard at 1A6X4. This is the 
> 2nd section from the right with the 9 jacks for various options. The preselector 
> cable goes to the bulkhead behind the front panel to a jack labeled A1P1. The 
> back of this jack is connected to a long cable (labeled PRE-P5) that runs behind 
> the bulkhead over to the preselect decode card. Attached is a photo with some 
> notes in red. You might have to expand the photo to read the notes. If I can be 
> of any other help, let me know. 
>  
> Les Layton 
>  
> ---- David Schofield <davesc50 at tiscali.co.uk> wrote: 
> > Hi All, 
> > 
> > I've just dropped on the digital preselector option for my 8718-9, but can't 
> for the life of me figure out how it's supposed to connect to the receiver. 
> > The preselector filter unit is self explanitory, it sits between the antenna 
> socket and the input converter, with a short SMC patch cable connecting it's 
> output back to the converter. 
> > The filter assembly then has a 9 way D-type lead connected to it that mates 
> with the output of the preselector decoder PCB, that apparently sits in the 
> PRE-XA2 slot in the control cage. 
> > My problem is, that try as I might, I can not locate the PRE-XA2 slot.... 
> > All the unused slots in my receiver seem to have nothing but power and ground 
> connections, looking at the schematic diagram the decoder PCB connects to the 
> top 9 bits of the address bus, plus, possibly a line marked as B, and a clock as 
> well 
> > 
> > To confuse matters further the schematic diagram in the PRE option manual 
> seems to show the decoder PCB being plugged into socket XA3 rather than PRE-XA2. 
> > The PRE option manual is available on Terry O's site, but seems to make little 
> sense. The 8718 manual I have makes no mention of the PRE option, or the PRE-XA2 
> socket. 
> > 
> > Can anyone out there enlightem me as to how to install this option? 
> > A couple of decent pics of a receiver with this option fitted will probably do 
> fine, The only ones I can find on the net are not detailed enough. It should not 
> matter if the receiver is an 8716 or an 8718. 
> > 
> > I am pretty sure that my receiver should take this option, as it has all the 
> mounting points for the filter assembly, and the PRE option is there ready to be 
> "struck off" on the rear option plate, their just does not seem to be an 
> obviously suitable socket to plug the decoder PCB in to... 
> > 
> > The only thing I can think of is that the 8718-9 receiver has the ISB option 
> fitted, and that the PRE and ISB options may be mutually exclusive, and that the 
> ISB option is already taking up the socket, but it does not seem to be so. 
> > 
> > Cheers, 
> > Dave.S. 
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