Author Topic: Help me! My power supply Gwintek gpd-3303S does not increase when turn knob up (Read 4013 times)

uoemx · « **on:** May 13, 2019, 01:26:18 am »

I recently bought a old GPD-3303S power supply. When i turn on and turn knob up it not increased but only at 4.5V.
Link here:
https://youtu.be/CturhOBos7U.
Everyone help me please!

bitseeker · « **Reply #1 on:** May 13, 2019, 01:42:17 am »

Welcome to the forum, uoemx!

That's an interesting problem. Does it do the same thing with nothing connected to the outputs? What about when there's nothing connected and both outputs are turned on?

If you recall 30V from the memory, then turn the outputs on, do you actually get 30V on both outputs?

uoemx · « **Reply #2 on:** May 13, 2019, 03:21:32 am »

Thanks bitseeker
all are normal except the problem above
Here:
https://youtu.be/cFaa71qfRLE

innkeeper · « **Reply #3 on:** May 13, 2019, 04:14:26 am »

What happens when you try setting the voltage via the usb port?

plurn · « **Reply #4 on:** May 13, 2019, 04:22:49 am »

To put this in a simple way to start with, I would suspect that there are faulty components, or damaged soldering, or loose cables, or blown fuses (there are many fuses), inside the unit that need to be repaired.

Since you have not opened it up to check to see if there is any obvious damage, I kind of expect that you are not familiar with repairing damaged electronics. Perhaps you should tell us about your level of experience with electronics so we can see if we should try and help you troubleshoot, or just advise that you should get an electronics repair technician to fix it. It can be dangerous for beginners to mess with high voltages inside electronics if they do not know how to be safe.

Anyway, to start with something you can try without opening it up. Make sure you have set the input voltage correctly on the back of the unit to match the mains voltage in your area.

Found this service manual linked in another thread. May be of help to you or others here trying to help you: http://www.eltest.hu/pdf/GPD3303SM.pdf

innkeeper · « **Reply #5 on:** May 13, 2019, 04:45:51 am »

looking over the manual seems you can get updated firmware from gwinstek, maybe the firmware got corrupted.
seems like an easy thing to try.

plurn · « **Reply #6 on:** May 13, 2019, 04:57:18 am »

user manual:

https://www.gwinstek.com/en-global/products/downloadSeriesDownNew/7837/1474

There is a remote control section starting on page 43.

There is an interesting command:

ERR?

"Returns the instrument error messages."

Don't know if it would tell you what is wrong but maybe it will? They might just be command errors rather than real errors.

Links to software/drivers if needed https://www.gwinstek.com/en-global/products/detail/GPD-Series

uoemx · « **Reply #7 on:** May 13, 2019, 05:28:24 am »

Thanks everyone. I tried installing on the computer with the command line but below 4.5v it was ok on 4.5v, nothing happened. I can't find the firmware link to load it

innkeeper · « **Reply #8 on:** May 13, 2019, 05:37:23 am »

in the manual it says you have to contact them to get it. they don't post it on their site.

for what it is worth, I had to request the firmware form them via email for my GWInstek meter and they sent it to me, no problems.
it did take them a few days to reply though

uoemx · « **Reply #9 on:** May 13, 2019, 06:59:07 am »

Thanks innkeeper. I will contact gwintek, but now you have the firmware of this power supply? Can you send it to me?
Thank you very much

innkeeper · « **Reply #10 on:** May 13, 2019, 03:43:05 pm »

no, I don't have it for the power supply.

i had contacted them once for firmware for a meter.

TopLoser · « **Reply #11 on:** May 13, 2019, 04:12:13 pm »

Is it possible you have set an upper voltage adjustment limit on that channel?

I think it's possible to do that on these units, to stop you accidentally exceeding a set point by spinning the knob too fast.

bitseeker · « **Reply #12 on:** May 13, 2019, 05:54:56 pm »

Quote from: uoemx on May 13, 2019, 03:21:32 am

Thanks bitseeker
all are normal except the problem above

Thanks for the video. It does look like the analog parts of the power supply are functioning properly. Since the output does go above 4.5V, all the transformer taps and relays seem OK. The short circuit behavior looks fine, too, so it's regulating the output as expected.

The manual doesn't indicate that there is an over voltage protection (OVP) setting, but it acts like there's one set to 4.5V. So, it may be a software/firmware problem.

Nevertheless, take a look inside for any loose wires or bad solder joints.

Quote from: innkeeper on May 13, 2019, 04:14:26 am

What happens when you try setting the voltage via the usb port?

That's what I was going to ask next. Can you try setting different voltages via USB? Does that work as expected and provide proper output?

rfdes · « **Reply #13 on:** May 13, 2019, 06:45:31 pm »

I've attached the firmware that GW sent me some time back. I have no idea if it is the latest. I also have a service manual if you need that.
Good luck -
Jim

innkeeper · « **Reply #14 on:** May 13, 2019, 07:22:38 pm »

Quote from: TopLoser on May 13, 2019, 04:12:13 pm

Is it possible you have set an upper voltage adjustment limit on that channel?

I think it's possible to do that on these units, to stop you accidentally exceeding a set point by spinning the knob too fast.

that was my first thought too.. but after scouring the manuals, i didn't find such a documented feature.

uoemx · « **Reply #15 on:** May 14, 2019, 01:11:36 am »

I controlled it via computer
https://youtu.be/Blr1HWVNJI4

uoemx · « **Reply #16 on:** May 14, 2019, 01:40:17 am »

And then I upgraded the firmware of rfdes
https://youtu.be/SxdNumUvGKI
Thank you everyone for your enthusiastic support. Thanks rfdes

bitseeker · « **Reply #17 on:** May 14, 2019, 01:50:39 am »

Yay!

That was the first time I've seen one act this way. Glad it was an easy fix.

uoemx · « **Reply #18 on:** May 14, 2019, 02:38:44 am »

There is a new problem on channel 1 after firmware update. Previously this channel used normally as the video above. I calibrated but failed
https://youtu.be/5HeAoviWumg

uoemx · « **Reply #19 on:** May 14, 2019, 02:49:57 am »

Channel 1 runs wildly

https://youtu.be/dDZmxmR7m60

bitseeker · « **Reply #20 on:** May 14, 2019, 03:19:30 am »

Did this happen only after calibrating?

Try reflashing the firmware. Maybe the microcontroller (or external) flash/EEPROM is bad.

uoemx · « **Reply #21 on:** May 14, 2019, 04:25:05 am »

Hello bitseeker. I have reflashed the firmware twice. I also calibrated before and after the same results on channel 1

bitseeker · « **Reply #22 on:** May 14, 2019, 04:55:22 pm »

The only other things that come to mind at the moment are to (1) see if USB programming is also behaving badly and (2) check if you can get a copy of some older firmware or ask GW Instek if there is any compatibility issue between your serial number and that firmware version.

Otherwise, any other debugging will probably be inside the power supply, although so far all the problems seem to be software.

uoemx · « **Reply #23 on:** May 15, 2019, 01:22:20 am »

Thanks bitseeker for supporting. I contacted and sent identification to Gwintek. When will you come to Ho Chi Minh Vietnam, I will invite you to coffee!

bitseeker · « **Reply #24 on:** May 15, 2019, 04:34:20 am »

Thanks, uoemx. Hopefully, they have an answer. I haven't seen one behave like this before.

uoemx · « **Reply #25 on:** May 16, 2019, 02:16:06 am »

Thanks for everyone's help. After I contacted gwintek, I received the support that is a version 2.11 firmware for Gwintek gpd-3303s power supply. After firmware upgrade, channel 1 is still wrong, after calibration and this is the result
https://youtu.be/lPnQrTPfFgo
Thank you once again for your support. Wish everyone health and success

bitseeker · « **Reply #26 on:** May 16, 2019, 02:40:19 am »

Looks good.

innkeeper · « **Reply #27 on:** May 16, 2019, 03:28:42 am »

Congradulations

evgen2910 · « **Reply #28 on:** January 22, 2020, 02:43:37 pm »

Hi, are you Gwintek working properly? Can you send me a firmware what GW sent to you? I have same problem

uoemx · « **Reply #29 on:** January 29, 2020, 07:22:18 am »

Check inbox

Zlodey · « **Reply #30 on:** March 21, 2020, 08:33:03 pm »

Please, send me firmware v2.11 for Gw Instek gpd-3303s. Thanks!

uoemx · « **Reply #31 on:** April 12, 2020, 01:07:45 am »

Here you are: Power supply Gw Instek gpd-3303S firmware
http://www.mediafire.com/file/oc6itjq83u4s992/V2.11.7z/file


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