EEVblog 1650 - Sequre HT-140 SMD Desoldering Tweezers REVIEW

[I.T. Manager]

Menu item OLED lets you select 0/180 degrees display direction.

Thank you kind sir, I will put my order in for one ASAP.   

[ceut]

I have received mine some minutes ago.

FW 1.03 too.

After making some adjustement on tweezer, and setup some items in the menu+voltage calibration (+0.2V offset for mine - checked with my Keysight U1232A DMM): I find this really a great tool after testing removal of some SMD caps and R
It is super fast for that task 

Menu items are not so hard after understanding the 5s timeout for waiting to go back.

But I have some T° overshoot showing on the Oled screen like we can see on the Dave review, but not as big as in the video, don't know if it is a bug with having 2 sensors, or real overshoot ? I will try to check that back home.

Also, I have not found support page on the Sequre website for downloading firmware of this HT-140.
So I don't know how the 1.02FW user could upgrade their tweezers 


Edit:
>About 2 to 5°C  off so it is good, will try to calibrate it later.
>All is grounded to USB-C and DC ground. About 100VAC between tips and mains ground. Will try also to put the mains ground on negative, but I have to check the leakage current before.
>Positive DC Jack is also the positive USB-C, so we can also power directly from USB-c at any voltage without having a PD or any other handshake protocol negociation.
  I already do this with my MHP30 hotplate

[ceut]

So I have checked the current leakage from DC GND to Earthground: very very low 0.27mA on U1272A which has a low burden voltage

I have also checked the USB-C cable which was in the package with the superb japanese USB tester: great quality with 147milliOhms

=>The simpliest way to ground the HT-140 is to take a spare used USB-A cable and put the Negative DC and Shield to the AC Earthground : it will put the USB-C to Earthground too directly from the Sequre PSU    (that(s what I have done for testing, and will made that more permanent)

Here are photos as always 

[W00fer]

Sequre is working on adjustable motion sensor support in firmware to come.

For me it's very sensitive now.

[ceut]

Sequre is working on adjustable motion sensor support in firmware to come.

For me it's very sensitive now.

Great to read that, same thing for me: the sensor setting is wayyy too sensitive 


Also, I have made my first video of my HT-140 in real use, and also with my new camera 

Here is the short video:

[W00fer]

Sequre is working on adjustable motion sensor support in firmware to come.

For me it's very sensitive now.

Great to read that, same thing for me: the sensor setting is wayyy too sensitive 


Also, I have made my first video of my HT-140 in real use, and also with my new camera 

Here is the short video:

Nice video. I hope you will work out the manual focus if possible.

Sequre can do a lot more with the firmware but it's upto us to ask them. Since there is a steep language barrier I might suggest bugs and features also in Chinese to them. Albeit with Google translate.

[ceut]

Nice video. I hope you will work out the manual focus if possible.

Sequre can do a lot more with the firmware but it's upto us to ask them. Since there is a steep language barrier I might suggest bugs and features also in Chinese to them. Albeit with Google translate.

Thank you 
For the focus, yes I saw it after reviewing the video on my computer.
In fact, the camera has tried to focus sometimes on my glove 
I have actived the tracking mode, and targetting the PCB (this one works as we can see in the video that the camera is moving its head alone  )
I think that when the camera lost the tracking of the PCB, it tries to focus on the closest item when the tracking object is lost 

Will try to do better next time (with manual focusing I think) 

For firmware improvement, I have to send a mail to Sequre to add the PowerON sensor mode, as I have (and always use) with IronOS on my TS-100.
=>This mode heats up when I take it up from the cradle, from room temperature, without doing any action on A/B buttons, and only after powering the unit.

Edit: Mail sent to Sequre contact support with this improvement firmware proposal
Hope they will reply me
(it is this setting on IronOS of my TS-100: https://ralim.github.io/IronOS/Settings/#setting-start-up-behavior , set to "R=standby, heat-off until moved" )

[ceut]

Attached is a picture of the mod i made to the Sequire S99 C245 iron. I marked it up where i cut fully through the PCB (and taped over with kapton tape), and then reconnected the 3 terminals in (what my research suggested) is the correct pinout. There is some confusion around the net about the pinout, so double check it. But yeah, my tip no longer jumps between 0V and 20V (referenced to USB GND) while the iron is running!

[edit] Looking at the mod again now, i've made a pretty big hot loop for the switching power through the tip in my haste to GND the tip properly. You might be better off tying the GND wire in as close to the SO-8 mosfet as possible as well. I might be overthinking it though, it seems to work.

The Sequire S60P C210 was connected correctly as far as i could tell, and the all metal L245 usb-c iron i ordered from aliexpress some other time also has the correct pinout (ie tip is connected to the USB-C shield). I've added a phote of all three below as well.

I like the idea of just using a power bank, although with the really big tips i have seen these USB-C irons go up to 120W during initial heatup! And i'm sure that whenever i really needed to solder something i'd realise that i'd forgotten to charge the power bank 😅

Hello,
Thank you for poiting this 

I have received my S99 this morning, and I have 5.5Ohms between the tip and the USB-C shield 
The rear screw is also connected to the tip, so 5.5Ohms too between this screw and USB-C shield.

So completely different from the HT-140, where (I think) they have fixed this.
I have the latest board 1.5 version into it (it is showing it in the menu)

HW version: 1.5
SW version: 1.08

So I have to fix that too 

Question: Is there any problem with the feedback of the thermocouple  (negative voltage value) after the mod ?    Thank you 

Edit: I have found a russian guy who has done a great job with all JBC pinout analysis cartridge here:
http://adgd.ru/2021/01/04/jbc-soldering-cartridges-pinouts/

Edit2: I found "my way" to fix this, and have opened a new topic S99 here: https://www.eevblog.com/forum/reviews/sequre-s99-topic-mod-infos/msg5741905/#msg5741905 

[W00fer]

Someone dumped the HT140 1.03 firmware on IronOS github, made rudimentary pinouts and took photo's of the PCB.
So I hope either the features he requested are forwarded to Sequre team or are made available in IronOS.
Firmware is 64kb and the rest is available space.

[Demon Xanth]

Something I've noticed with mine:
Though it says it can do PD140, I have yet to see it request more than PD60. Even with a PD240 cable and PD100 and PD140 supplies. My PD140 battery bank wouldn't negotiate with it at all. (but then it also had issues with my DHO804, so I blame Baesus on that one).

Removing some SMT electrolytic caps from some boards and SMC sized diodes, it worked very well though!

Edit:
I found the menu options. I'm a dingus.

[W00fer]

Sequre needs 2 things in this firmware

If you connect a 100w charger 20v 5A and then a 15v 3a (45w) charger it bootloops until you change the setting in the menu.

Also if you disconnect one of the tips it goes constantly into beeping error, until you plug it back in and turn it off in the menu.

It should fallback to one only if the other isn't connected.

[W00fer]

It seems that the 3 and 5 mm wide C210 addons are only manufactured by Sequre?

Anyone got another link for them?

[atroz]

YIHUA has some that look the same.  I ordered them yesterday because AliExpress offered free shipping on them but not the Segure ones.  Will take a week or more for them to arrive and see if I made a mistake or not.   https://www.aliexpress.com/item/1005008269476408.html

[W00fer]

YIHUA has some that look the same.  I ordered them yesterday because AliExpress offered free shipping on them but not the Segure ones.  Will take a week or more for them to arrive and see if I made a mistake or not.   https://www.aliexpress.com/item/1005008269476408.html

Thanks a lot. I tried to find these but only found C245 ones.

[IanJ]

I have these tweezers, but didn't like the lack of earth ground on the PSU which was generating 104Vrms / 335Vp-p on the tips!

......so did something about it:

https://youtu.be/se6-jGZsHS0

Ian.

[W00fer]

Do these tweezers require 20v exact or is 19.5 also okay?
I have a 180W Dell power supply for a laptop that does 19.5v 9.23A
Model HA180PM180

Are the amps limited to 5?

Manual indicates it should be 28v 5A for 140W but this could be firmware limited?

[W00fer]

I have these tweezers, but didn't like the lack of earth ground on the PSU which was generating 104Vrms / 335Vp-p on the tips!

......so did something about it:

https://youtu.be/se6-jGZsHS0

Ian.

Would this be a solution? Just connect a wire from the tweezers to this plug.

[edavid]

For those in the US, it looks like the current lowest price is from newegg @ $89.99 with free shipping (ends 1/11/25).

https://www.newegg.com/p/0J6-00Z1-00043

If you order from sequremall.com, there is a discount code SQ8 that gives 8% off, but there is a shipping charge.  I think it's still less than AliExpress though.

https://sequremall.com/products/sequre-ht140-2in1-hot-tweezers-soldering-iron-desoldering-repair-tool-for-smd

P.S. Where can I download the manual?

[W00fer]

For those in the US, it looks like the current lowest price is from newegg @ $89.99 with free shipping (ends 1/11/25).

https://www.newegg.com/p/0J6-00Z1-00043

If you order from sequremall.com, there is a discount code SQ8 that gives 8% off, but there is a shipping charge.  I think it's still less than AliExpress though.

https://sequremall.com/products/sequre-ht140-2in1-hot-tweezers-soldering-iron-desoldering-repair-tool-for-smd

P.S. Where can I download the manual?

Manual is on page 1 of this topic, in one of the first posts. Aliexpress pricing is mostly only interesting on sales like Halloween, Christmas, Black Friday and 11.11
They won't cover customs duties so the Sequre shop is cheaper (and Newegg).