Author Topic: Siglent SPD4306X Quality  (Read 1330 times)

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Offline aaronsTopic starter

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Siglent SPD4306X Quality
« on: December 03, 2024, 08:46:40 pm »
I recently got a siglent SPD4306x to replace a SPD3303 which started randomly turning it's outputs off. I also needed the higher current outputs.

I've been quite happy with it, and it definitely seemed higher quality than the 3303. Earlier today I noticed a bothersome tone in my lab which I traced to the fan on the supply. I figured I'd replace the fan with a noctua fan to solve that problem (fan is ordered, should be an easy job.)

However the first thing I noticed upon opening this supply I thought would be interest to the eevblog community.
2452457-0

Everything else looks pretty good. There isn't even any Siglent Rust, but the fact that someone screwed this down and thought this looked fine to ship does make me worry. I slid 2 small washers in there to reduce that bend. I think that standoff might just be a tiny bit shorter than the others, but I haven't completely disassembled the unit to verify that.
 

Online tautech

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Re: Siglent SPD4306X Quality
« Reply #1 on: December 03, 2024, 08:53:41 pm »
 :o
Will report incorrect standoff has been used.

Welcome to the forum.

You can hear the fan at full load in a very recent Defpom vid in the SPD4000X thread:
https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/msg5734885/#msg5734885

Expecting a Defpom teardown soon....
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Online Martin72

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Re: Siglent SPD4306X Quality
« Reply #2 on: December 03, 2024, 09:07:32 pm »
Ouch,
Especially with SMD assemblies, such mechanical tension is very unwelcome.
Hopefully just a “Monday device”.

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #3 on: December 03, 2024, 09:14:50 pm »
The noise I was noticing wasn't normal fan noise. It was more like some sort of resonance that ended up sounding like a slight tone in the 1000-1200Hz range, and it was happening at the idle/no-load fan speed. Not a big deal, and overall this 4306X is a huge upgrade over the 3303 in every way.
 
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Online tautech

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Re: Siglent SPD4306X Quality
« Reply #4 on: December 03, 2024, 09:23:02 pm »
I recently got a siglent SPD4306x to replace a SPD3303 which started randomly turning it's outputs off.
Which exact model ?
C, X-E or X ?

The restart issue is a known failure of a 2A bridge on the Control PCB and a fairly simple fix.
You can find several posts about various solutions.
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Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #5 on: December 03, 2024, 10:19:35 pm »

Which exact model ?
C, X-E or X ?

It is a SPD3303X-E. I'll take a look through the posts for the fix. If I can make it reliable again, I can use it in my office. Thanks!
 

Offline J-R

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Re: Siglent SPD4306X Quality
« Reply #6 on: December 03, 2024, 10:39:28 pm »
Surely the solution is to get a warranty replacement?
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #7 on: December 03, 2024, 10:50:43 pm »
Surely the solution is to get a warranty replacement?

I got it in 2020, so it was out of warranty and they wanted something like $300 to repair it. They also offered a discount toward a replacement, but only if I replaced it with the same model, which I didn't want.
 

Online tautech

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Re: Siglent SPD4306X Quality
« Reply #8 on: December 03, 2024, 10:56:00 pm »

Which exact model ?
C, X-E or X ?

It is a SPD3303X-E. I'll take a look through the posts for the fix. If I can make it reliable again, I can use it in my office. Thanks!
Early units were very reliable but later we ran into the tiny circular 2A bridges failing.
Latest units have had a redesign and an uprated inline bridge is now used.

All you need to know is in this thread:
https://www.eevblog.com/forum/repair/siglent-spd3303x-e-reboot-problem/
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Offline J-R

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Re: Siglent SPD4306X Quality
« Reply #9 on: December 03, 2024, 11:01:53 pm »
Oh?  I thought the SPD4000 series just came out last year.
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #10 on: December 03, 2024, 11:12:11 pm »
Oh?  I thought the SPD4000 series just came out last year.

I got the SPD3303X-E, which had developed the random output shutting off problem, in 2020. After Siglent support told me it was out of warranty and would cost $300 or something like that to repair, I bought the SPD4306X to replace it. That was in 2024. The 4306 is the one with the fan noise and bent PCB, but since it's working fine, I'm not looking to try to replace it at this point.
« Last Edit: December 04, 2024, 12:12:11 am by aarons »
 

Online tautech

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Re: Siglent SPD4306X Quality
« Reply #11 on: December 03, 2024, 11:51:58 pm »
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Offline J-R

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Re: Siglent SPD4306X Quality
« Reply #12 on: December 03, 2024, 11:56:15 pm »
Well, I'm going to call it a 2023 product:
 

Online tautech

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Re: Siglent SPD4306X Quality
« Reply #13 on: December 03, 2024, 11:58:25 pm »
Well, I'm going to call it a 2023 product:
Sure but not for the western markets.
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Online TheDefpom

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Re: Siglent SPD4306X Quality
« Reply #14 on: December 04, 2024, 04:44:09 am »
I edited the 2nd part of the review this afternoon which has the teardown in it, mine is fine the standoff is the correct size.

Makes me wonder if yours is a very early unit, mine had a fan above the transformer too which yours appears to not have installed ?
« Last Edit: December 04, 2024, 04:46:19 am by TheDefpom »
Cheers Scott

Check out my Electronics Repair, Mailbag, or Review Videos at https://www.youtube.com/TheDefpom
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #15 on: December 04, 2024, 05:00:14 am »
Yeah, mine just has a single fan at the back. I ordered mine from Siglent in September, so not that long ago. I assume there was just a random shorter standoff in the bin of standoffs or something like that.
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #16 on: December 05, 2024, 06:24:21 pm »
Upon further examination of the fan in this supply, it appears it is a non-standard 4-wire fan. The additional 2 wires are hooked up to two thermistors in parallel, one on each side of the heatsink. The fan speed control apparently is happening inside the fan itself, so replacing this fan won't work unless I want one that is constantly running at full speed.

It's an odd design. The fan power comes from the front panel as a 4 wire connector that ls the same JST XH as the fan itself, but those 4 wires are +14, +14, GND, GND, which is then regulated to 12 on the rear board for the fan.

Anyway, now I'm trying to see if I can source a replacement fan from Siglent or D-Fan (the manufacturer of the fan) since I think it's a customized part.
 

Offline BILLPOD

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Re: Siglent SPD4306X Quality
« Reply #17 on: December 06, 2024, 06:44:19 pm »
Good Morning Aarons,

... I figured I'd replace the fan with a noctua fan to solve that problem (fan is ordered, should be an easy job.)

So didn't the Noctua fan work, since you now want a Siglent OEM fan :-//


 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #18 on: December 06, 2024, 08:14:46 pm »
Good Morning Aarons,

So didn't the Noctua fan work, since you now want a Siglent OEM fan :-//


That's right. I saw a 4-wire fan and assumed it was standard, but it is not.
 

Offline KungFuJosh

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Re: Siglent SPD4306X Quality
« Reply #19 on: December 06, 2024, 08:37:06 pm »
That's right. I saw a 4-wire fan and assumed it was standard, but it is not.

Can you share some photos of the stock fan and the PCB connector?

Thanks,
Josh
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #20 on: December 07, 2024, 02:13:50 am »
Well I removed the connector housing from the stock fan, but it was a JST XHP-4. Here is a picture of the fan, and also a bit of the fan PCB, where you can see the 3rd and 4th wire are connected to pads labelled TR- and TR+. Those signals are the two sides of two thermistors in parallel.
 

Offline KungFuJosh

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Re: Siglent SPD4306X Quality
« Reply #21 on: December 07, 2024, 02:41:37 am »
Well I removed the connector housing from the stock fan, but it was a JST XHP-4. Here is a picture of the fan, and also a bit of the fan PCB, where you can see the 3rd and 4th wire are connected to pads labelled TR- and TR+. Those signals are the two sides of two thermistors in parallel.

That sounds like pretty common 4-wire fan setup? I don't know those circuits well, but I would guess that if anything isn't standard, it would be the order of the wire connections. I wouldn't expect a manufacturer to reinvent a basic PWM fan.
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #22 on: December 07, 2024, 04:00:29 am »
The standard 4-wire fans has a tachometer signal output and a PWM signal input.
 

Offline KungFuJosh

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Re: Siglent SPD4306X Quality
« Reply #23 on: December 07, 2024, 04:34:00 am »
There's no PWM signal coming from the PSU PCB? Is it really just 2 positive and 2 ground wires? That's really odd.

Have you tested the fan separately from the 4306X?
"Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before." - Steven Wright
 

Offline aaronsTopic starter

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Re: Siglent SPD4306X Quality
« Reply #24 on: December 07, 2024, 05:05:46 am »
I did hook up the original fan to a 12V supply and tried giving it PWM on those extra pins but it didn't do anything. Thats when I peeled back the sticker and saw the silkscreen. I suspect I damaged the speed control logic in it because now it only runs full speed, even with a 250k pot across those two terminals.
 


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