Well i looked at the manual backdating and the only 2 boards that change between 2804 and 2812 Are the CPU board and the sweep board no mention of changes to the motherboard or other boards .
I updated the cal constants
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On Mar 4, 2022, at 23:43, Bruce via groups.io <bruce@...> wrote:
?Couple of things to think about:
1) Is the motherboard the same between the 2804 and 2812 ?
2) What about the PALs on the CPU board
3) Also check that the CAL constand definitions are the same between the versions.
Cheers!
Bruce
Quoting Lothar baier <Lothar@...>:
i am banging my head right now which doesnt happen all too often so maybe somebody here has experienced a similar issue :
i have a 8341B Sweeper , the serial# is 2804A and the FW Date is 1982 , i am trying to use this sweeper with a 8516A which requires a higher FW revision (May 88) and also a SN 2812A or higher .
i looked up the changes between 2804 and 2812 and only the CPU board and the sweep board changed so i went on ebay and found a CPU board that already had 1992 firmware installed from a dealer i consider reputable .
The board came in and i installed it in my 8341B tonight , after hitting preset the unit comes up with a start frequency of 100MHz and stop of 200GHz , overmod indicator and unleveled blinking , unit accepts frequency entries but nothing lower than 100MHz .
So i accessed the calibration contants and updated them using the ones from the old board , overmod goes away but unleveled is still blinking and still no lower than 100MHz .
Next i took out the FW EPROMS and put them in the old CPU Board just to experience the same issues , now i took the old FW Eproms and plugged them in the new CPU board and things work fine so the CPU board seems to be fine so the problem seems to be with the FW Eproms , unfortunatly i no longer have a EPROM programmer so i cant download the image and burn new EPROMS .
Question here is now has somebody here installed or tried to install 1992 firmware on a 8340 or 41 and run into the same problems and if so what was the resolution ?
