Electronics > Repair
Datron 1271 repair
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rigrunner:

--- Quote from: ManateeMafia on September 21, 2017, 05:49:08 pm ---Great job on the repair!  :-+

More Datron/Wavetek meters saved from the hands of would-be butchers. I think you have added a great tool to your lab if you plan on keeping it. I couldn't find a download from my FRAM boards so I will have to get a copy from both of my 1281 and post them.
It will be added to my to-do list once I clear the bench.

--- End quote ---

Thanks :)  It is a keeper.

The SECN data is 4KB and not 96B as i first thought and that fits nicely into the 8KB space.

First time i've written anything in python and i can't say that i like the indenting, but attached is a piece of code that should dump the 1271/1281 nvram regions into 3 separate files along with a combined nvram image. (It requires linux-gpib)

It takes about 5 minutes for everything to come down via GPIB and shows progress for each region as it goes along.

Reading nvram from Datron Instruments 1271 to 23900-7.X.nvram
Dumping PRIM to "23900-7.PRIM.nvram"
PRIM done.           
Dumping IPZ to "23900-7.IPZ.nvram"
IPZ done.           
Dumping SECN to "23900-7.SECN.nvram"
SECN done.           
Creating 23900-7.nvram.bin
Finished.



Mickle T.:
1271 DC Assembly PCB have some hardware incompatibilities between an older (1989) and newer (1992) versions. Firmware is incompatible too.
rigrunner:
Interesting - I haven't come across any firmware earlier than my V2 rom in my searches. The 1281 seems to have made it to V3 rom.

The diagrams i have mention DC400866 V1.1 and 1.3 with the old line locking.

doktor pyta:
Great job! Thanks for posting.

Note: Something like year ago I added a switch to disconnect filament of both VFDs in my 1271.
It is connected in series with F504 or F505 fuse (one of them).
The switch was placed on the rear panel.

I can confirm that this modification does no harm to the meter/ display.
rigrunner:

--- Quote from: doktor pyta on November 08, 2017, 12:12:22 am ---Great job! Thanks for posting.

Note: Something like year ago I added a switch to disconnect filament of both VFDs in my 1271.
It is connected in series with F504 or F505 fuse (one of them).
The switch was placed on the rear panel.

I can confirm that this modification does no harm to the meter/ display.

--- End quote ---

Switching off the display is on my list of things to do. My fall back plan was a toggle switch on the supply lines  :-+
Glad to hear it's not detrimental to the display. I wasn't sure how they'd react to that.
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