| Electronics > Repair |
| E3631A firmware version 1.6 |
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| vtp:
Has anyone got the firmware in subject line to upload/attach/email/etc? I have a couple of these supplies, one with inguard MCU that is silent and other working but with a little noisy readback. Both are with FW1.4 in the inguard MCU. However, in the (almost) working one the 300 mV offset when a channel is turned off is getting on nerves. That is what the FW1.6 is supposed to fix. The (now almost) working one was quite a fix. Bought it as "does not turn on" - well of course it would not as there was no fuse. |
| vtp:
To update this, I got the faulty supply working for now. There were two faults: U15 SRAM on top board was faulty and resulted in MCU reseting itself continuosly. This is why the main MCU was not running and there was no display and no beep when powering up. After the MCU was back in business the 6V output was railed. Root cause was U21B with the following voltages in its pins: pin 5 (+) = -0.288V, pin 6 (-) = -0.022V, pin 7 (output) = 13.91V. LM339 and the rest connected to this looked ok so pretty obvious, eh? Replacement of U21 with LM358 as was the original IC there cured the 6V section. There are at least two different HW versions of this supply. Both I have open at the moment seem to be pre-year 2000 or so and have some differences to the newer version schematics. For example, net "A" on top board is connected to GND(A) whereas in the newer supply it is provided from DAC. U21 on the bottoms board is given as TL072 in new schematics, old supply had LM358. +-25V bias supply bulk capacitors (C44, C45) seem to run quite hot. I have not removed and measured these yet as but I suspect they have been cooked by the adjacent heatsink and being on top of the casing. Finger test puts the temperature to around >= 40 degC with lid open and in normal ambient room temperature. As for capacitor replacements, I made this list (Mouser order codes): --- Code: ---647-UVR1V471MPD 470u 25V (->35V due I_ripple) 647-UPJ1H471MHD 470u 50V 661-EKMGG500ELL102MK 1000u 50V 647-UPS1J102MHD1AA 1000u 63V 598-SLPX333M025E9P3 33000u 16V 30x50x10 snap-in 80-PME271M610MR30 100nF 275V X2 P=20.3mm --- End code --- The list has been compiled by checking original capacitor data for ripple current rating and subsituting currently available capacitor with equivalent or slightly better Iripple in equivalent package size. The last one on the list is replacement for X2 cap on bottom board. It is already cracking open so I am not waiting for the fireworks to begin. I also got FW 2.1 from a friendly forum member but it will result in error codes 741, 745 and 746 meaning that the supply would need be re-adjusted. |
| openloop:
In similar situation and got some questions: Did 2.1 firmware worked in units which previously had 1.4 installed (i.e. older version units)? Did it help with negative biasing of switched off output rails? How can I too get my hands on that firmware file? Thanks! |
| Micke:
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! |
| z01z:
If someone needs the 1.5 firmware, send me a PM! The output bug seems not to be present on this version either. |
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