FastFranz Posted March 18, 2020 Share Posted March 18, 2020 Ciao, I opened today (got it time ago) a packages containing a brand-new BM-01 frame/engine. As I said it's new/never used all I did has been putting in place the requested battery (2xLR44) and pushing the micro-switch: to my utter desappointment, NOTHING HAS HAPPENED! It refused to start, period! I pulled out/pulled in batteries two/three times, cleaned the contact but ... 🥺😵 🥺😵 😵. Any idea on where I should look for the bug? Greetings - sadly I left Africa about two years ago - from Ha noi (VN) Francesco Link to comment
brill27mcb Posted March 18, 2020 Share Posted March 18, 2020 Make sure you are putting the batteries in right side up, which always seems upside-down to me. I am used to the flat end of a battery being the bottom, from larger (AA, A, C, etc.) batteries, but these small batteries usually get oriented the other way. Also try varying how long you hold down the on/off button. Too long doesn't work, and just poking it seems to be too short. There then seems to be a slight delay before the wheels start turning. So just experiment a bit, patiently, before giving up all hope. Rich K. Link to comment
Sascha Posted March 18, 2020 Share Posted March 18, 2020 I also had this problem. Make sure you buy brand name batteries. The cheap ones didn't work. I got Duracel. Link to comment
FastFranz Posted March 19, 2020 Author Share Posted March 19, 2020 Ciao (stays, in italian, for Hi), @Sascha: I gave a try to Duracell/Energizer and another brand (chinese, found here in Ha noi): no way. @brill27mcb: I will try a different timing when switching (well, trying to ...) to run! Thx for your suggestions I'll keep you tuned. Francesco Link to comment
FastFranz Posted March 22, 2020 Author Share Posted March 22, 2020 (edited) Ciao, NO WAY!!! ... Many attempts with different "push-time" (on the micro-switch). Many attempt swithcing battery faces (same face up at same time) led me to no result: stubbornly refuses to go! 🤐 🤐 🤐. Any other hint? Francesco Edited March 22, 2020 by FastFranz Link to comment
Madsing Posted March 22, 2020 Share Posted March 22, 2020 Make sure there is a good contact between the motor and the PCB. Two places (highlighted in red in the photo below): 1. (most important) at the back of the bus, there is something that looks like a spring, it must make contact with the back of the motor, i.e. the metal/green cylinder next to it 2. in the middle of the PCB, there is a contact that is pressed against the side of the motor just below Gently try pushing/moving these two parts a bit with a toothpick or a small piece of plastic. 1 Link to comment
FastFranz Posted March 24, 2020 Author Share Posted March 24, 2020 (edited) Ciao, @Madsing: OK, i'll give it a try. THX Francesco Edited March 24, 2020 by FastFranz Link to comment
FastFranz Posted March 24, 2020 Author Share Posted March 24, 2020 Ciao, Madsing, you are right! ... 👍. All the same, regrettably i haven't reached my goal: I attached two small piece of electric wire to shown contacts and that to an AAA battery. Doing so the engine revs the way it has to. Then the bug is in contacts (already had this problem with, at least, another frame/engine) but the toothpick was not the solution: using due contacts it doesn't work at all! ... I'm stuck, now. Francesco Link to comment
Madsing Posted March 25, 2020 Share Posted March 25, 2020 Do you have a multimeter to check that you have 3V power supply on the PCB? You can check at the two solder points left and right of the top screw that holds the battery container with the motor and PCB. 1 Link to comment
cteno4 Posted March 25, 2020 Share Posted March 25, 2020 A cheap little multimeter is always your friend and oh so handy! jeff Link to comment
FastFranz Posted April 22, 2020 Author Share Posted April 22, 2020 Ciao, Sorry no multimeter. All I can add i that giving contact (an AAA battery directly to two different poles) the engine runs as it's supposed to do. But, this being said, I have no idea on how to go any further. Last but not least deepest apologises for delayed answer (the going here is bit hectic). THX everybody. Francesco Link to comment
chadbag Posted April 22, 2020 Share Posted April 22, 2020 A cheap Chinese multimeter should easily be available where you are at (or a short aliexpress.com away). You really need a multi meter in this hobby Link to comment
cteno4 Posted April 22, 2020 Share Posted April 22, 2020 Yep aliexpress or ebay are probably good sources to get something to Vietnam. Probably cheap ones in any electronics shops there. Really is with the $5 or so, very very handy to have, especially in this situation to trace a problem. jeff Link to comment
inobu Posted April 23, 2020 Share Posted April 23, 2020 Try running a magnet under the bottom. That controls the bus motor. See it that will let it boot up. Inobu Link to comment
FastFranz Posted June 12, 2020 Author Share Posted June 12, 2020 Ciao, Again my apologies for the long silence but here - Hanoi - only recently the situation is more relaxed and I had to "take back" many things left behind. That's the life ... 😉 Then, Inobu: REALLY SORRY, but I don't understand what you want to tell me. But the time has come to tackle the "Bus" topic again so, pls, explain it other way. THX! Francesco Link to comment
inobu Posted June 15, 2020 Share Posted June 15, 2020 Placing a magnet under the bus will switch the speed or stop the motor. The thought was to use the magnet to change toggle a flag on the microchip. Just a thought. Inobu Link to comment
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