[Premium-Rx] WJ-8888 Questions.

[Francesco Ledda]

I know nothing about the WJ-8888, but once I worked on a WJ-8618B that had a processor board issue. After a long investigation and out of ideas, I checked the EPROMs; it turned out that the 4 EPROMs were blank. After loading the SW, everything worked perfectly. Note, that the EPROMs had a WJ SW load number and the erase windows were covered by dark stickers.

Francesco
KF5RXV

Sent from my iPhone

> On Mar 31, 2014, at 6:31, Heinz Breuer <hbreuer at debitel.net> wrote:
> 
> Hello Dave,
> I have a manual copy WJ-8888B dated May 1978 and it has the 701609-1 schematic.
> I will scan it later today.
> vy 73 Heinz DH2FA, KM5VT
> 
> Von meinem iPhone gesendet
> 
>> Am 31.03.2014 um 10:12 schrieb David Schofield <davesc50 at tiscali.co.uk>:
>> 
>> Hi All,
>> 
>> I've just dug out my troublesome WJ-8888 and after struggling with it for nearly 4 years decided to get a 2nd opinion....
>> The answer I received is interesting, to say the least.
>> Although some may ask (myself included) why I didn't pick up on this in the first place....
>> 
>> Basically the fault lies on or around the A17 "receiver register" PCB, something which I had already figured out, what I hadn't realised is that the PCB fitted to the receiver is possibly incorrect....
>> This is mostly because it never occurred to me to check, as I just assumed it to be faulty.
>> 
>> The required board is a 791140 and I have a 791609 installed.
>> 
>> So my question is three fold;
>> 
>> 1. Does anyone know if the 791140 and the 791609 are compatible, I.E. is one a direct replacement for the other.
>> 
>> 2. Does anyone have a schematic for the 791609 PCB, as it's not in either WJ-8888 manual that I posses. It may not even be for a WJ-8888.
>> 
>> 3. Does anyone have a "correct" 791140 A17 board that I can buy, or borrow, to prove my suspicion about the PCB being incorrect.
>> 
>> Cheers,
>> Dave.S.
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