| Electronics > Repair |
| ES120 Electronic Screwdriver repair |
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| lambdaknight:
--- Quote from: phenix on November 24, 2021, 07:27:31 pm --- --- Quote from: 0xde4dbeef on November 24, 2021, 05:38:57 pm ---You say the behavior changed with different firmware versions? ??? --- End quote --- Yes, previous firmware results a few minites of operation and sudden shut down. After that the device did not start. The usb cable was plugged and only after that I've be able to boot the device again. Now the engine is not working at all. When I did photos I unplug the engine. The pcb works fine... So, I have to test the engine. (Unfortunately, I cannot test it in my current location) --- End quote --- I have this exact same problem and have been thinking of how to fix it, but I'm a electronics noob. It seems to most frequently shutdown when it finishes screwing a screw in and it hits resistance. And then it won't work until I plug it into USB and reboot it. |
| phenix:
Today, I am not sure, but I bet that I'd got a problem with the motor. I am still not able to perform expository testing to be 100% sure. I do not have a spare engine here... but I tried to launch current es121 engine... it seems that it is in short circuit now. Too sad, because it is not big chances to find a replacement engine. Consolation news... miniware launched es15 |
| 0xde4dbeef:
ah yeah I just checked the ES15. Even more expensive, and their customer service has become worse every year. I've had a bunch of their products, most of them went bad and last time I contacted them, a "customer support agent" contacted me via a hotmail.com address and asked me to transfer money to his paypal account. After contacting miniware directly asking them what the deal was, they said the hotmail and paypal address are indeed legit ... I don't think I'll by any new products from them again. been trying to find a replacement motor without success so far, I have also contacted miniware to see if they'd sell me a replacement motor, but i've been waiting for "only" one week. I'll keep you updated. |
| MrDob:
hello guys, I will have used the screwdriver 2-3 times, encountering the problem. I thought it was the battery, I changed it with a 350mA one, nothing the problem persisted. Gogglando, I came across your thread. He enlightened me by finding the problem. In practice it is sufficient to remove the 50mΩ resistor, which acts as a probe. Removed and bridged the screwdriver will no longer have the problem. I recommend with this modification it will not be able to break in case of strong mechanical resistance. |
| nem0:
Thanks for this thread. My ES121 gave up after about a year. It was the motor. Contacted miniware and they did say they dont have any of the old model motors and it was especially made. After some hunting and ordering a few options of Aliexpress I found one that works. I did see a Minware ad for this screwdriver that said it was 20,000RPM so I tried to find a motor as close it this as possible. FYI for anyone trying to fix motor problems with an ES121 I found that the following motor works well: https://www.aliexpress.com/item/1005001921128013.html you'll need to cut the shaft down a few mm. Heat the brass gear attached to the old motor with a jet lighter/torch to remove from the shaft, heat again to attach to the new motor. |
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