My analysis of the fan control functionality was a bit off. The unit failed again with the same part dying after a further year. I decided to trace circuit out (see link below) but the basic functionality is that the TL431 (Q2) is driven by a reference from the CPU (pin14) via voltage divider R5/R4. R3 couples this back in to Q2 reference. The cathode of Q2 connects to the base of the TIP122 (Q1). R2 provides some feedback. As can be seen in the schematic snippet below, the TIP122 (Q1) is used as a linear regulator, and thus runs very hot! I have added extra heatsinking! See www.george-smart.co.uk/files/youtube/fiuYjMqZiDg/clone_quick_861dw_fan_controller_schematic.png
@@m1geo I'm thinking about changing some resistor value so that the minimum fan speed would be lower, I think that even at the minimum value it is still high
@@m1geo I will fix transistor at back side of the box and connect via cable to the PCB. I think they do not use pwm probably it was cheaper. I don’t know if this microcontroller generate pwm
Sir i have same smd but its having issue of improper heating. example if we set heating to 350'c its heating at 150'c.. i have changed its heating element but problem not solved...please give a solution to the problem please
Definitely a fake. The real one has a EMI noise filter in metal can in rear and a separate motor controller mosfet board on the left and wires have the white cloth sheild over it.
You can get the real version. It is completely different and not a copy of a brandname like most Chinese products. Quick actually designed it themselves and better then most the brandname hot airstations I used over the years even $800 dollars Hakko POS stations. The real one actually has a brushless motor with a completely separate motor controller and wires are thicker and unit properly grounded with even a resistor in ground ESD port. The real one are actually good. I has one for over 4 years and used it daily at shop and had to only replace heater once on it. The second one just bought a couple days ago as found one cheap used but barely as metal on heater still shiny with extra angle and BGA tips. It is definitely legit to my older one as looked inside of course to make sure not a clone. I use a more expensive Weller as couldn't find another Quick 861dw a few months ago as all on eBay and Amazons were fake but actually prefer the Quick as easier to adjust without having to look while looking in microscope. The Weller you have to set profiles and no auto shutoff as you have to push button in handle. The Weller does have ramp up and down profiles you can set and good performance but the quick I like better as buttons placement and auto cutoff when in stand. When you look for the real one they are going to be about $330 new and will have the Quick logo on front no other branding. Plus, the rear will have mounting spots you notice for the EMI filter. Then, likely it is real.
@m1geo No I have the real one. It completely different inside. The real one uses a brushless motor with a separate motor mosfet controller board on left side and has a rear EMI noise filter in metal can on right rear and white heat resistant cloth covering over wiring. The real ones have a much better fan and controller that has much better consistent airflow. Plus heater easily changeable with removing three screws on handle and pulling it out and you just insert new one. No wires as push in connection. That copy is one of the worst I seen of these. I hope you didn't pay to much for it. The real one cost about $330. It is definitely much better built. Put a bigger heatsink on that transistor so it won't overheat and short again. I had to do it with Triac based Chinese desoldering stations as heatsink was to small and they kept going short. Put a larger heatsink resolved that issue completely.
My analysis of the fan control functionality was a bit off. The unit failed again with the same part dying after a further year. I decided to trace circuit out (see link below) but the basic functionality is that the TL431 (Q2) is driven by a reference from the CPU (pin14) via voltage divider R5/R4. R3 couples this back in to Q2 reference. The cathode of Q2 connects to the base of the TIP122 (Q1). R2 provides some feedback.
As can be seen in the schematic snippet below, the TIP122 (Q1) is used as a linear regulator, and thus runs very hot! I have added extra heatsinking!
See www.george-smart.co.uk/files/youtube/fiuYjMqZiDg/clone_quick_861dw_fan_controller_schematic.png
mine uses tip127 pnp
@@mendesant I modified it so that the transistor is bolted down and it's survived so far.
Why they didn't just use the PWM signal is beyond me? 😂
@@m1geo I'm thinking about changing some resistor value so that the minimum fan speed would be lower, I think that even at the minimum value it is still high
@@m1geo I will fix transistor at back side of the box and connect via cable to the PCB. I think they do not use pwm probably it was cheaper. I don’t know if this microcontroller generate pwm
No heat sink gunk? Probably why it failed in the first place. Good video.
Nice work! Is it possible to post a image of the upgraded heatsink? Have a most awesome afternoon!
obrigado a minha aconteceu a mesma coisa troquei o componente que você mostrou no video e voltou a funcionar normal.
Excellent! I'm glad you got it fixed!
Sir i have same smd but its having issue of improper heating. example if we set heating to 350'c its heating at 150'c.. i have changed its heating element but problem not solved...please give a solution to the problem please
Definitely a fake. The real one has a EMI noise filter in metal can in rear and a separate motor controller mosfet board on the left and wires have the white cloth sheild over it.
Simple units...
Absolutely copy 😀
This is not original one bro you gor 💯 % copy 861dw
Lol! They're all copies!
Yes, this is not an original product
You can get the real version. It is completely different and not a copy of a brandname like most Chinese products. Quick actually designed it themselves and better then most the brandname hot airstations I used over the years even $800 dollars Hakko POS stations. The real one actually has a brushless motor with a completely separate motor controller and wires are thicker and unit properly grounded with even a resistor in ground ESD port. The real one are actually good. I has one for over 4 years and used it daily at shop and had to only replace heater once on it.
The second one just bought a couple days ago as found one cheap used but barely as metal on heater still shiny with extra angle and BGA tips. It is definitely legit to my older one as looked inside of course to make sure not a clone. I use a more expensive Weller as couldn't find another Quick 861dw a few months ago as all on eBay and Amazons were fake but actually prefer the Quick as easier to adjust without having to look while looking in microscope. The Weller you have to set profiles and no auto shutoff as you have to push button in handle. The Weller does have ramp up and down profiles you can set and good performance but the quick I like better as buttons placement and auto cutoff when in stand.
When you look for the real one they are going to be about $330 new and will have the Quick logo on front no other branding. Plus, the rear will have mounting spots you notice for the EMI filter. Then, likely it is real.
One of the bad quick copy absolutely very bad
This is what they all look like inside?
@@m1geo most of good or expensive hot air while you put handle on the cradle the fan should automatic full spinning for cooling heater element
@@idr3aming_inc yes, this one does, but it had broken after 3 years of use. I fixed it in the video.
@m1geo No I have the real one. It completely different inside. The real one uses a brushless motor with a separate motor mosfet controller board on left side and has a rear EMI noise filter in metal can on right rear and white heat resistant cloth covering over wiring. The real ones have a much better fan and controller that has much better consistent airflow. Plus heater easily changeable with removing three screws on handle and pulling it out and you just insert new one. No wires as push in connection.
That copy is one of the worst I seen of these. I hope you didn't pay to much for it. The real one cost about $330. It is definitely much better built.
Put a bigger heatsink on that transistor so it won't overheat and short again. I had to do it with Triac based Chinese desoldering stations as heatsink was to small and they kept going short. Put a larger heatsink resolved that issue completely.
This is a copy 861DW
Agreed.
Just watch any genuine Quick vs Fake comparison video. First the motor is not brushless and no power filter block in the back of your unit. @@m1geo
@@krisiluttinen ah well it was cheap and it works (now I fixed it). 😂 I use it a lot, a I've had it for a long while.
@@m1geocopy Quick 861DW
fake
@@m1geohow do you like it so far. I got a fake also for half the price. Debating If I should keep or return. Did any upgrade that's worth it?