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Yes the lab 8340B does have the new CPU board ( same part#)
So I opened the lid and swapped CPU boards , my 8341B works ok with the CPU board from the 8340B except the top frequency is 26GHz , the 8340B however shows the same issue as the 8341 if I plug in the CPU board I bought so I think its safe to say the board has a problem

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________________________________
From: [email protected] <[email protected]> on behalf of Bruce via groups.io <bruce@...>
Sent: Saturday, March 5, 2022 10:05:13 AM
To: [email protected] <[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8341B Issues 1992 firmware

Does the "lab" 8340B have the same CPU board as your "new" CPU? If
not, how can putting the 92 FW on that board resolve anything?

Are the PALS on the new CPU the same as the PALS on the old CPU

Cheers!

Bruce

Quoting Lothar baier <Lothar@...>:

The board goes through the regular cycle when powered up the only
difference is that the frequencies the unit comes up with are
screwed up !
The problem is that I don’t have any evidence that the firmware on
the new board is functional , I bought the board on ebay from global
test as used and I don’t know if they checked it or how long ago it
was checked before going into stock .
I have a 8340B in the lab that has the correct serial number range
and a 88 FW so as last resort I could pop the lid and pop the 92 FW
chips in this unit to see if it works


Sent from Mail<> for Windows

From: Bruce via groups.io<mailto:bruce@...>
Sent: Saturday, March 5, 2022 9:40 AM
To:
[email protected]<mailto:[email protected]>
Subject: Re: [HP-Agilent-Keysight-equipment] 8341B Issues 1992 firmware

When you had the new board running the newer software were any of the
CPU LEDs lit ? What evidence do you have that the firmware on the new
CPU is functional (This is a long shot as I believe the CPU checks
the check sum of the FW)

Cheers!

Bruce
Quoting Lothar baier <Lothar@...>:

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

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 ?