Electronics > Repair
E3631A firmware version 1.6
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z01z:
According to the service manual, pin 31 is connected, to the /WR pin of the uC.
This is probably OK though. There is no reason to do write operation to the EPROM address range. Moreover, a simple write instruction won't overwrite the flash, a specific sequence of write instructions are needed for a write or erase operation.
matches:
Ahh, OK. As a part of software write protection.

So I'm just waiting for the programmer to arrive...
z01z:
Apparently the flash works fine in the place of the OTP EPROM, I've just tested it.
matches:
Yes it worked for me as well. Thanks for the effort and the advise  :-+

After the update I got the following three errors:
1.   +741,"Cal checksum failed, string data"
2.   +745,"Cal checksum failed, DAC cal constants"
3.   +746,"Cal checksum failed, Readback cal constants"

So I did a calibration with software adjustment. Also I checked before and after the performance.
Before was way off. An output of 25 V gave a reading of 21 V, 1 A programmed supplied only 600 mA etc.
After adjustment the worst point uses about 20 % of the read back spec and 13 % of programm accuracy spec.

So thanks again. Before I found this thread I was under the impression the firmware could not be upgraded.
NickyDoes:

--- Quote from: Micke on February 23, 2017, 02:40:34 pm ---I have upgraded two E3631A with FW v2.1 without problems.
I have read about the incompatibility between old HW and new FW, so I was mentally prepared it could be problem  8) 
I think the old FW was something like v1.4 (or even older like v1.2).
I put the old EPROM in a small plastic bag and strapped it with a cable tie inside unit, in case of downgrading in the future...
Yepp, the output bug disappeared according to this service note: http://literature.cdn.keysight.com/litweb/pdf/E3631A-04C.pdf
I can E-mail FW v2.1 to you, send PM!

--- End quote ---

Keysight's CDN doesn't deliver URLs for the long term. Here's one that might be a bit more static:
https://hpwiki.mcguirescientificservices.com/_media/service_notes:e3631a-04c.pdf
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