bob d

HI, My bike goes just fine as I've fitted a new front wheel drive kit to it. The problem is stopping. Its got a rear wheel Shimano Nexave BR-IM50-R roller brake fitted to it. I would buy a new unit or the necessary spares but cant find a supplier apart from second hand units. Any suggestions would be appreciated Many Thanks Bob D

Hello out there, I’m more or less new to all this and am looking for a kit to convert my bike to electric assistance. I’m currently only interested in pedal assistance but will perhaps occasionally want the bike to self propel without any pedalling. Also I think with a minimum of 3 levels of assist. I’m retired now and have spent half of my life fixing old motorcycles and being an engineer in the first place gives me some confidence regarding the fitting of a kit hopefully wont be a problem, and to keep things simple I’m sure a front hub motor type will be adequate for what I want. It wont be used for anything other than 5 mile ish trips to the shops and visiting friends and wont be used to climb mountains and riding in the rough stuff and the wet will be avoided. The kits I’m currently looking at is a Voilamart 26” front wheel 36V 350 Watt arrangement and a BMS Tech 26” front wheel 250 Watt. Both are supplied without batteries. I’m wondering if anyone has any experience with these kits. Any comments/help would be most appreciated. Many Thanks Bob D

Ah well, the original resistor wasnt positioned as I have positioned the new one. It was set at about 45 degrees sloping up from the PCB. The end of the original resistor was almost if not touching the PCB where the crater/burned area is. I've added another picture. Many thanks bobd

Ah, I can see the reason for your comments. The 3 spiders legs are actually very fine scratches in the surface of the PC. And what might look like a solder blob is actually more like a shallow crater burned into the surface of the PCB. I'll take some more photos tomorrow and forward them on. Thanks again bobd

Hello again, and I'm back with the latest saga of the poorly EZEE. So, the 5 volt regulators turned up this morning and I've spent a few hours in the workshop practicing my soldering skills and soldering a regulator back into its position on the PCB. That's where the first bit of iffy news comes from as it was clear that all was not as it should be be. Close inspection (very close) as in best reading glasses and a magnifying glass revealed that the copper track on the back of the circuit board had lifted and broken away. I've fixed this, I think, by soldering some fine copper wires into the correct places on the back of the board. Whilst doing this I noticed that on the component side of the board directly beneath were the original resistor was fitted there is a rather scorched looking item which I think is a component, see photo. Its the component, if that's what it is, that is close to the "T2" and one of the legs on the new resistor. However, I carried on with the job and went back to the tests you have guided me through. The first thing I noticed after connecting to the battery was the red LED wasn't on, then it was, then it wasn't, and that's how its been all evening during the tests without any pattern, and there doesn't seem to to be any dodgy connections. I checked the supply and that was 37V. Then I checked as follows: The new resistor which shows 37V at one end and 29V at the other end. Then small regulator shows 14.5V at the IN end and 5V at the OUT end. The large regulator shows 15V at both sides. The motor halls were showing 5V. The throttle signal was up to 4V but seemed intermittent. The PAS was giving the 5V pulses. The Mosfet test when connected to the red battery wire on control box and the readings showed 50k at the blue wire, 15k at the green and yellow wires. When connected to the black battery wire at the control box the readings showed 29k at the blue wire and 13k at the green and yellow wires. I checked to see if there is any sign of life from the motor but unfortunately there is nothing. Clearly all is not well and I wonder what comes next ??? Many thanks again bobd

Hopefully all will go to plan and then the leftover resistors and regulators will be sent to gather dust in a far flung corner of a cupboard never to be seen again, and so I'll be quite happy to donate them to wherever free of charge. Many Thanks bobd'

AaaHaa. The new resistors turned up today and so I've fitted one. Still no 5V regulator fitted though but suddenly there are some readings as follows. The resistor readings are 37V at one end and 31V at the other and its resistance is 197 Ohm. The reading from the vacant holes for the 5V regulator, ie from the middle ground hole to the IN volt hole is now 14V, and the small red LED light is now working. Does this sound correct ? Clearly I have to wait for the regulators in eager anticipation but in the meantime, does anyone want 49 resistors. Many Thanks bobd

Hi again and thanks for the encouraging reply. I've been having a ponder over what comes next with this little conundrum and guess its just a matter of waiting until the parts arrive and then installing the new regulator and resistor and working back through the previous notes and going through the tests you have previously provided. I've been doing a little research and I'm now under the impression that it doesn't matter which way around the resistor goes but from what you have previously said it does matter which way the regulator goes. So, the question is, can I assume the new regulator goes with its flat face in the same orientation as the old one. If what I'm saying here is correct then I guess we don't need to talk anymore until the parts come and I've done the surgery. Many thanks again for all your help for which I am most grateful. bobd

Right, here we go with my findings. THE REGULATORS As you said regarding price it seems that from ebay + the P&P which is about as much as the components the price gets bumped up. On amazon (with prime) they are double the price to those on ebay, but there is no postage, plus I can easily send them back if not suitable, unfortunately they will take about a week to get here. So, what I've found on 4 different regulators of the 5V TO-92 type, is that the ground is always the middle terminal and the output is to the left, that's when your looking at the flat face of the regulator and it is stood on its three legs. However I don't know which way around the legs on the regulator from my PCB are. All of the 5V output regulators I have looked at have a maximum input voltage of 30V. The title of the regulator I have ordered from Amazon is Chanzon 50pcs 78L05 TO-92 Three-Terminal Voltage Regulator Stabilizer Transistor There is a data sheet on amazon when your looking at the component of which I've attached a copy (I think). THE RESISTORS The resistors are also from amazon and have the title: sourcing map 50Pcs 200 Ohm Resistor, 2W 5% Tolerance Carbon Film Resistors, 4 Bands for DIY Electronic Projects and Experiments I have ordered the above and hope I have it correct, but if not please re educate me and I will re-order accordingly. In both cases it seems as though I will get a small sack full and so if you know anyone who wants the left overs they're welcome to have them. Many Thanks again bobd REGULATOR-1.pdf

Ah, right, yes, in other words I aren't exactly full of confidence with the old multimeter, but after a chat with a mate who is I've done the recommended stuff and checked the resistor (the one next to the 12V rgulator) and the reading just stays at 0.0. I've had the multimeter dial set at its lowest position and at 2k and also used a different multimeter and still nothing. Also said mate suggested removing one end of the resistor from the PCB and re checking and still there is no reading. So, as I haven't got any odd resistors laying around I cant think of anything to make a comparison test on and confirm what I'm doing is correct. If I knew what spec a replacement resistor was I'd order some from Amazon as they seem to have various types. So, I'll await your advice and proceed accordingly. My grateful thanks again bobd

Well I'm back and no burnt fingers etc and the little black 3 legged thingy is out. The holes are clear and any solder splatter which got on the PCB has been delicately removed. Unfortunately the readings are still the same. I get 37V at one end of the resistor and at the other end 0.3V and one reading of 0.6V, and just to check to make sure I'm using the multimeter correctly I'm connecting the black probe from the meter to where the black battery wire is soldered into the PCB and the red probe from the meter to either end of the resistor. So I'm now wondering what is next to investigate ? Many Thanks again bobd

Arghhhh, remove that little 3 legged black thing indeed. Well that certainly will test me, but best foot forward etc etc. That'll be a job for tomorrow, and a steady hand and perhaps a third hand form a friend. Oh yes I forgot to mention, the outer painted type of layer on the resistor has all crumbled away in bits, perhaps due to overheating. Watch this space as they say and I'll report back to you accordingly. Many Thanks again bobd

Hi again and the readings from the resistor are 37V at one end and 0.3 at the other end. I've taken this measurement between the main black wire going into the PCB (which I believe is called ground) and each end of the resistor. However I don't know what the readings should be. Thanks Again bobd

Oh yes, I forgot to mention that I don't recollect trying to get any readings between the white and black wires.

Hi again. Just back from another session with the mustimeter and there is definitely 36v at the red wire at KSI. For the next checks I have assumed that I'm going between a black wire and the legs on the regulators to establish some readings. So the readings from the large regulator read 0.6V on one outer leg and 0.3v on the other outer leg and 0.6 on the middle leg. The smaller regulator reads 0.3v on each outer leg and 0.0 on the middle leg. Many Thanks bobd