Toolboard 1LC v1.3 Phase A error.

nico.rast

Good evening guys, sorry, I think I’ve broken the toolboard :(. Is there anyone who does repairs? I’d rather not buy a new one.

A pin came loose while the printer was on, and it hasn’t worked since then. I tried with two different motors, a Sibor 14st20-1004A following the motor’s color code, and another stepper. Both give me the same error.

Thanks

nico.rast

Some news, .

This resistor (L7) doesn’t seem to be soldered properly. When it makes contact, everything works perfectly, but when it moves due to vibrations, the extruder motor reports that Phase A is interrupted.

droftarts

@nico-rast I think L7 is an inductor, so it smooths the current flow in the circuit to the motor. See page 4 of the schematic: https://github.com/Duet3D/Duet3-Toolboard-1LC/blob/master/Toolboard_1LC_v1.3/Duet3_TB_1LC_Schematic_v1.3.pdf

It's on phase A, so it seems likely to be the problem, though I would have thought the error message would be disconnection rather than a short to Vin if it was not making good contact. Though it may only show up when the driver is powered up, and then causes the reset as the driver tries to set the current level.

I'm not sure what has caused this. It's possible that when the pin came loose, it generated enough heat to melt the solder.

If you have a soldering iron and are comfortable making the repair, I think repositioning and resoldering L7 would restore functionality.

Ian

nico.rast

@droftarts Hi Ian, after searching online for the replacement part, it turns out to be a filter—my mistake for not checking earlier! I haven't tried soldering it because I'm worried about touching nearby components and potentially causing more damage. Is there any way to get the exact part number for this component? I found something online, but you know, if it's not an exact match, I might make things worse.

nico.rast

@droftarts i found this: TDK MLK0603L3N0ST000.
Can be suitable? I know a man that repair smd elettronics but he needs the pieces...

droftarts

@nico-rast I think that TDK component isn't suitable as it's an inductor.

Our specification is a Ferrite bead 0603 300R 300mA 250mOhm, ie at the target frequency range (100MHz) they offer at least 300R of resistance, no more than 250mOhm (lower is better) and current of at least 300mA. Lots of ferrites will meet those specs and many will exceed them in some way

The part we use is Wurth 742792641. Alternatives are TDK MMZ1608B301CTAH0 and Pulse PBY160808T-601Y-N.
From Mouser:
Wurth 742792641: 300R 2A 150mOhm
TDK MMZ1608B301CTAH0: 300R 500mA 250mOhm
Pulse PBY160808T-601Y-N: 600R 1A 200mOhms

Ian

nico.rast

@droftarts Thanks!