[Premium-Rx] WJ-8711A Help Sought

Thu Apr 23 20:45:01 EDT 2020

I'm using the Rev Q manual from Terry's site.  See page 4-25 on that manual, although that same table should be in your manual somewhere.

Images below didn't come thru so I can't see what you're referencing.

-----Original Message-----
From: W2HX <w2hx at w2hx.com>
To: w3jn at verizon.net <w3jn at verizon.net>; premium-rx at mailman.qth.net <premium-rx at mailman.qth.net>
Sent: Thu, Apr 23, 2020 8:30 pm
Subject: RE: [Premium-Rx] WJ-8711A Help Sought

#yiv8497375076 #yiv8497375076 -- _filtered {} _filtered {}#yiv8497375076 #yiv8497375076 p.yiv8497375076MsoNormal, #yiv8497375076 li.yiv8497375076MsoNormal, #yiv8497375076 div.yiv8497375076MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv8497375076 a:link, #yiv8497375076 span.yiv8497375076MsoHyperlink {color:blue;text-decoration:underline;}#yiv8497375076 a:visited, #yiv8497375076 span.yiv8497375076MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv8497375076 p.yiv8497375076msonormal0, #yiv8497375076 li.yiv8497375076msonormal0, #yiv8497375076 div.yiv8497375076msonormal0 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv8497375076 span.yiv8497375076EmailStyle19 {font-family:sans-serif;color:windowtext;}#yiv8497375076 .yiv8497375076MsoChpDefault {font-family:sans-serif;} _filtered {}#yiv8497375076 div.yiv8497375076WordSection1 {}#yiv8497375076 Thanks, John. The manual I am looking at may not be right, but I found it on Terry O’s website. According to it, the errors are different than what you report… https://watkins-johnson.terryo.org/documents/manuals/WJ-8711A-receiver-manual-Rev-Z.pdf    Which manual are you using?           Although, frankly, the ones you reported look easier to fix hihi!       From: w3jn at verizon.net <w3jn at verizon.net> 
Sent: Thursday, April 23, 2020 8:23 PM
To: W2HX <w2hx at w2hx.com>; premium-rx at mailman.qth.net
Subject: Re: [Premium-Rx] WJ-8711A Help Sought    Eugene you have multiple errors going on with this radio.    Table 4-6 in the manual lists the errors.  The number that it's displaying is the sum of the errors so you have    8192: PRESEL OVERLOAD 2048: RAM FAIL 1024: REF ERROR 256:  BAT ERROR ------- 11520    My 8711A seems to always report a ref error on power-on but the reference is definitely good.  Batt error is already being reported.  Does your display report the ref error?    It doesn't appear you have the preselector so not sure why that's indicating an overload, unless there's a pulldown or pullup resistor that's bad.    One thing about 8711s, the yellow tantalum caps tend to short.  Between my 8712 and my 8711A I can't count how many of those damn things I've replaced.    You could try the COLD START procedure detailed in the manual to see if that clears things, but I'd replace the RAM battery first.    Let us know how you progress.    73 John             -----Original Message-----
From: W2HX <w2hx at w2hx.com>
To: premium-rx at mailman.qth.net <premium-rx at mailman.qth.net>
Sent: Thu, Apr 23, 2020 7:29 pm
Subject: [Premium-Rx] WJ-8711A Help Sought Hi friends,    A few years ago, I picked up two WJ-8711A receivers. One looked nice in a desktop cabinet and the other was clearly a parts mule.    Nice one: https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201757.jpg    Both units with the parts mule atop the nice one that is out of its nice cabinet https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201903a.jpg    The nice one has some problems. BATT ERROR (no big deal, probably the coin cell needs replacing) and ERROR=11520 Any idea what ERROR=11520 is?  But probably worse, or maybe related, is an awful squeal coming out of the speaker.. https://youtu.be/aVI5blTALZM    Here are some internal pictures of the nice one. https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201848.jpg https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201850.jpg https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201850a.jpg    Along with the parts mule, I also have tons of other parts including a spare board. https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201850b.jpg https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201852.jpg https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201853a.jpg    interesting that the spare board uses a dallas cheerleader memory chip, whereas the nice one has some other chip in there (maybe EEPROM?).    some heavy encoder knobs and little panel switches (the current knob is garbage, so light) https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201855a.jpg    Then here is the inside of the parts mule: https://w2hx.com/x/Watkins%20Johnson/WJ-8711A/0423201907.jpg    This project may be more than I care to take on, but I figure with a parts mule, extra digital board, other various bits and bytes, I might be able to make one working radio. So my question to the group is, anyone have a suggestion on the audio howl/squeal? And what should I know about that error?    Thanks all! 73 Eugene W2HX                ______________________________________________________________ Premium-Rx mailing list Home:http://mailman.qth.net/mailman/listinfo/premium-rx Help Page:http://mailman.qth.net/mmfaq.htm Post: mailto:Premium-Rx at mailman.qth.net Help Contact eMail: radio at 8zo.com Home Page: http://www.premium-rx.org/ 