[Drake] Re: RR3 Digital Control Board replacement

[Barry L. Ornitz]

Cornell, PA3BTS, asked:

> After an extensive fault search in my RR3 receiver (maritime 
> version of the R7) it seems that the Digital Control Board 
> is faulty, most probably the PROM IC type (N)82S123(N).
> Can anyone give me a source for a replacement board or a 
> replacement IC? Is it necessary to program the IC and if so, 
> with which information?

The 82S123 is an old Signetics 32 x 8 bit fuse PROM.  To 
program it, you blow out fusible links internal to the chip.  
Some web searching should provide details on how this is done.
You don't really need a special programmer, just a means to 
set the address bits and a power supply to blow the fuses.

I have no idea of the contents of the information in the 
82S123.  Perhaps someone else can provide this.  While getting 
rather scarce, these IC's can still be ordered from Jameco 
Electronics (www.Jameco.com).

        73,  Dr. Barry L. Ornitz     WA4VZQ     ornitz@tricon.net

My other hobby, besides old radios, is Keeshond rescue.  I 
have quite a large pack as well as many other Nordic breeds.