R2014D/0900HS muddled display
Posted: Mon Apr 08, 2019 12:22 pm
Dear all,
New member here - I mostly use an IFR 500A and an IFR 1200S for Ham repair and repeater work, but I just acquired an R2014D which on the exterior appears to have lived a rough life but looks pretty clean on the interior. It has one major issue which I need to clear up before I can move on to its testing, repair and alignment.
The display shows nearly all question marks where blanks are expected and many of the other characters which are supposed to be present are clearly swapped for another letter/number. I have read every post on this board about the R2001D machines and found one (R2001D keypad jibberish #p496109 by W8TMT) which at first seemed like it was the solution. In Terry's case, the special function code 70 reset yielded a clear and intelligible display. In my case however, neither codes 70 nor 79 did anything to change the problem.
I then thought that perhaps the keypresses were being misinterpreted by the machine. So I set about to blindly set the frequency, generate output, and measure with a counter. This worked perfectly. The keypresses (using virtually every key in some combination) were interpreted and the frequency was set correctly.
I switched over to SA mode (not many question marks and a good trace) and was able to set the center frequency. The peak as measured by transmissions on 40m and 2m matched the center position well. FM modulation was observed as well.
Browsing through the service manual, I see that character generation is handled by A14 and A7 (as described in sections 14.2.4.1-3). I fathom that that is where I'm headed next (along with buying a small mountain of electrolytic caps and perhaps some tantalums for recapping).
Here is a link to a pdf containing a small deck of pics for the initial testing:
https://drive.google.com/open?id=1FKCoO ... Bq0fb4DQCo_
In the pictures you may note that the digits for 0 1 2 and 3 display correctly (as do 8 and 9) while 4 5 6 and 7 are displayed as 0 1 2 3 (??).
Any advice would be gratefully appreciated. Thanks for such a helpful board!
73 de ac2pl
New member here - I mostly use an IFR 500A and an IFR 1200S for Ham repair and repeater work, but I just acquired an R2014D which on the exterior appears to have lived a rough life but looks pretty clean on the interior. It has one major issue which I need to clear up before I can move on to its testing, repair and alignment.
The display shows nearly all question marks where blanks are expected and many of the other characters which are supposed to be present are clearly swapped for another letter/number. I have read every post on this board about the R2001D machines and found one (R2001D keypad jibberish #p496109 by W8TMT) which at first seemed like it was the solution. In Terry's case, the special function code 70 reset yielded a clear and intelligible display. In my case however, neither codes 70 nor 79 did anything to change the problem.
I then thought that perhaps the keypresses were being misinterpreted by the machine. So I set about to blindly set the frequency, generate output, and measure with a counter. This worked perfectly. The keypresses (using virtually every key in some combination) were interpreted and the frequency was set correctly.
I switched over to SA mode (not many question marks and a good trace) and was able to set the center frequency. The peak as measured by transmissions on 40m and 2m matched the center position well. FM modulation was observed as well.
Browsing through the service manual, I see that character generation is handled by A14 and A7 (as described in sections 14.2.4.1-3). I fathom that that is where I'm headed next (along with buying a small mountain of electrolytic caps and perhaps some tantalums for recapping).
Here is a link to a pdf containing a small deck of pics for the initial testing:
https://drive.google.com/open?id=1FKCoO ... Bq0fb4DQCo_
In the pictures you may note that the digits for 0 1 2 and 3 display correctly (as do 8 and 9) while 4 5 6 and 7 are displayed as 0 1 2 3 (??).
Any advice would be gratefully appreciated. Thanks for such a helpful board!
73 de ac2pl