ToolkitRC M7 MultiCharger Fan Coilwhine Fix - Page 1
Forum section: electronics / repair

author: ceut
author_rank: Regular Contributor
timestamp: September 24, 2022, 03:26:31 pm
content: 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 !I was having an error of about -0,18V ! So it will overcharge batteriesSo with the hidden menu and my Keysight: I have done the calibration and now it is goodSecond 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 audibleI 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 annoyingThen, 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 modsThank youEdit: I have opened a ticket on ToolkitRC support, and have uploaded a video on Youtube here:

author: ceut
author_rank: Regular Contributor
timestamp: September 30, 2022, 03:36:26 pm
content: Reply to myselfThe 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...

author: fatsafen14
author_rank: Newbie
timestamp: December 25, 2022, 10:32:04 am
content: 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?

author: ceut
author_rank: Regular Contributor
timestamp: December 25, 2022, 06:42:35 pm
content: Quote from: fatsafen14 on December 25, 2022, 10:32:04 amHello,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 hurryBoth 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 manufacturerI have posted all here:https://www.eevblog.com/forum/testgear/ruideng-riden-rd6006-dc-power-supply/msg4354561/#msg4354561

author: fatsafen14
author_rank: Newbie
timestamp: December 27, 2022, 09:46:56 am
content: Thank you so much for answer. Have a nice days:)