Electronics > Repair

ToolkitRC M7 MultiCharger Fan Coilwhine Fix

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ceut:
Hello !
I have bought a new multi charger tool: a ToolkitRC M7.
I have already a iMaxB6Mini (genuine), and a ISDT Q6 Nano from a friend to compare.
 
First warning: it is completly not calibrated out of the box !  :o
I was having an error of about -0,18V ! So it will overcharge batteries  :palm:

So with the hidden menu and my Keysight: I have done the calibration and now it is good :-+

Second problem: big coilwhine but only when the Fan is active (starts spinning at >45°C ).
To check that: I have stopped it with a little toothpick and the noise is super audible  >:(
I have checked on the user manual: between 45-53°C the Fan is in slow mode (big coil whine), and >53°C Fan is in full speed mode and no coil whine.

So I have just teared it down and put my Siglent on the 2 pins of the 5V fan, here is what I have on picture 1:
An horrible PWM signal at 1kHz => that's why it is really annoying  |O

Then, I have tried many capacitor value, and the best I have found is 47µF: the fan is faster and the coil whine is a less annoying.


==> I don't know is some of you have this charger, and have tried to fix the fan coil whine with another way ? It will be great to post your mods  :)

Thank you  :-+


Edit: I have opened a ticket on ToolkitRC support, and have uploaded a video on Youtube here:

ceut:
Reply to myself  :-DD

The ToolkitRC support has replied me.
They thank me for my "wonderful explanation" ! 😃
Also my ticket has been transfered to their engineer for either increase PWM frequency, or set the Fan at full speed.

I'm really to see that , they seem to be as great as Ruideng support ! (I have made another video with my RD6006P they have fixed after I have sent them the overshoot problem) .

So now, have to wait for a new Firmware update...

fatsafen14:
Hi.  I'm torn between toolkitrc m7 and isdt q6 nano for a charger too.  I'm afraid of m7 because of problems such as calibration etc.  but my heart is with him.  What are your general thoughts on the two?

ceut:

--- Quote from: fatsafen14 on December 25, 2022, 10:32:04 am ---Hi.  I'm torn between toolkitrc m7 and isdt q6 nano for a charger too.  I'm afraid of m7 because of problems such as calibration etc.  but my heart is with him.  What are your general thoughts on the two?

--- End quote ---

Hello,
For the time being, I don't recommand the M7 because I have posted my ticket on september, they told me that they will fix the problem with fw update, but I have no news from them since...  :-\

The Q6 Nano is really good, a friend has lent one to me and I have used a lot without any problem, and no coilwhine noise from it. Only some missing feature and a smaller screen.

So my advice is: if you are not in hurry, wait for the fw fix from ToolkitRC and go for the M7, or buy a Q6 Nano if you are in hurry  ;) :-+

Both need calibration, but the M7 is really bad with factory value (dangerous too  >:( ), whereas the Q6 is ok.


For a comparison with a great brand Ruideng (RD Official Store) from Aliexpress, I have uploaded them a bug from a PSU I have bought from them (a RD6006P): they send me the fix after about 2 month (hardware+software fix).
So now they are on my top value manufacturer  :clap: :-+
I have posted all here:
https://www.eevblog.com/forum/testgear/ruideng-riden-rd6006-dc-power-supply/msg4354561/#msg4354561

fatsafen14:
Thank you so much for answer. Have a nice days:)

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