http://www.soliforum.com/topic/12398/fu … -extruder/

I just repaired mine tonight.   Bridged the 0 ohm resistor and added a fuse holder with a 3 amp fuse.

Printing again!

dubbsd wrote:

carl_m1968
I think this should be made a sticky
it seams this happens fairly often.

That would be the job of a mod or admin. Ward?

Done.
Perhaps the OP would re title it to be more explanatory.

carl_m1968
I think this should be made a sticky
it seams this happens fairly often.

That would be the job of a mod or admin. Ward?

What model printer(s) is this on? Because not all are the same. It's my understanding the Bowden type extruder is new for the Pro so that right there makes it different. And where I been doing it...

carl_m1968 wrote:

This will hopefully be read by owners who have not yet made the mistake. For those of you that have, there are several threads on the topic and links in those to a thread discussing the issue and what to do to fix it.

The post is more of a warning to keep you from needing those threads.

As we know XYZ was considerate (or inconsiderate) enough to supply us with a brass brush for nozzle cleaning. Now for those who may not know this and I am sure there is someone out there, brass is a metal and that makes it conductive.

If you use this brush while power is applied to the heater you will cause a short that blow the protection resistors on the mainboards 12 volt input. These are surface mount components a very difficult to replace.

So to avoid this, heat the head up using the preheat options. Then turn off the power at the main switch then use the brush to clean while the nozzle is still hot.

Never attempt to clean the nozzle with the brush any time there is power to the machine. There is 12 volts on one side of the cartridge anytime the machine is on. The controller will switch ground off and on to allow current to flow and heat. The body of the heat block is brass and we already know about brass now. The heat block is attached to the frame ground through the various metal parts it is composed of
So by brusing even when cold but with power on you can short that 12 volts to frame ground and blow those resistors. Most of the Da Vinci heater cores have a small area of their conductors exposed very near the body and this is the point where brush contact makes the short.

If a mod or admin could sticky this in the XYZ section it would be very helpful.

Is that still a issue with the v6? I mean I cleaned it a lot of times with the brass brush while it was on (I've used 8kg PLA on it so far) and I never killed the smd protection resistors. I only printed 300g that come with the printer using the stock extruder.

This is in regards to the stock hot end. Although this could happen with any hot end if the powered side of the heater has an exposed conductor.

This will hopefully be read by owners who have not yet made the mistake. For those of you that have, there are several threads on the topic and links in those to a thread discussing the issue and what to do to fix it.

The post is more of a warning to keep you from needing those threads.

As we know XYZ was considerate (or inconsiderate) enough to supply us with a brass brush for nozzle cleaning. Now for those who may not know this and I am sure there is someone out there, brass is a metal and that makes it conductive.

If you use this brush while power is applied to the heater you will cause a short that blow the protection resistors on the mainboards 12 volt input. These are surface mount components a very difficult to replace.

So to avoid this, heat the head up using the preheat options. Then turn off the power at the main switch then use the brush to clean while the nozzle is still hot.

Never attempt to clean the nozzle with the brush any time there is power to the machine. There is 12 volts on one side of the cartridge anytime the machine is on. The controller will switch ground off and on to allow current to flow and heat. The body of the heat block is brass and we already know about brass now. The heat block is attached to the frame ground through the various metal parts it is composed of
So by brusing even when cold but with power on you can short that 12 volts to frame ground and blow those resistors. Most of the Da Vinci heater cores have a small area of their conductors exposed very near the body and this is the point where brush contact makes the short.

If a mod or admin could sticky this in the XYZ section it would be very helpful.

Is that still a issue with the v6? I mean I cleaned it a lot of times with the brass brush while it was on (I've used 8kg PLA on it so far) and I never killed the smd protection resistors. I only printed 300g that come with the printer using the stock extruder.

The post is more of a warning to keep you from needing those threads.

As we know XYZ was considerate (or inconsiderate) enough to supply us with a brass brush for nozzle cleaning. Now for those who may not know this and I am sure there is someone out there, brass is a metal and that makes it conductive.

If you use this brush while power is applied to the heater you will cause a short that blow the protection resistors on the mainboards 12 volt input. These are surface mount components a very difficult to replace.

So to avoid this, heat the head up using the preheat options. Then turn off the power at the main switch then use the brush to clean while the nozzle is still hot.

Never attempt to clean the nozzle with the brush any time there is power to the machine. There is 12 volts on one side of the cartridge anytime the machine is on. The controller will switch ground off and on to allow current to flow and heat. The body of the heat block is brass and we already know about brass now. The heat block is attached to the frame ground through the various metal parts it is composed of
So by brusing even when cold but with power on you can short that 12 volts to frame ground and blow those resistors. Most of the Da Vinci heater cores have a small area of their conductors exposed very near the body and this is the point where brush contact makes the short.

If a mod or admin could sticky this in the XYZ section it would be very helpful.