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Printrbot Talk Forum • View topic - Connectors on Printrboard

Connectors on Printrboard

Talk about assembling your printer

Connectors on Printrboard

Postby RetireeJay » 2013-Jun-Thu-11-Jun

As the Printrbot web site seems to be missing a fully-labeled diagram for the connections on the Printrboard, I have provided one here:

PrintrboardConnections1600X1200.jpg
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Connectors on Printrboard

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Re: Connectors on Printrboard

Postby plexus » 2013-Jun-Thu-12-Jun

Just a little detail: the "unused" is actually the E-stop or E-switch header. you may need to use it for your Y if you get the firmware lock-up issue that happens sometimes on rev B-D boards. for example, me. I started getting "commands waiting" from the host (Repetier) and this indicates the firmware didn't boot. there is a bug on the board that causes this if the Y switch is not open when the board is powered up. to solve this you move the Y switch to the E-stop header and change the pins.h in the firmware and recompile. there are threads about this elsewhere.

The point is "unused" is a little misleading because you may need to use it. I would label it "E-stop (typically unused)" so people don't get confused if they read posts that talk about using it.
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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Jun-Thu-12-Jun

OK, done.

But don't you have to be a Jedi knight and uber-geek guru to find all the software tools, special cables, and procedures to re-flash your software? I know when I read the threads about it I just get a headache... so many steps!!! (And I've been programming computers in Assembly, BASIC, Turbo Pascal, and Visual Basic since 1966; the problem is I kinda dropped out of that field in the last 10 years.)

(And if you can do re-flashing, why not fix the bug instead of implement a work-around?)
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Re: Connectors on Printrboard

Postby plexus » 2013-Jun-Thu-17-Jun

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Re: Connectors on Printrboard

Postby PxT » 2013-Jun-Thu-19-Jun

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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Jun-Sat-12-Jun

Help!
Can anyone teach me how to format the above picture (in the original post) so that you don't have to scroll to see all of it? (I'd prefer to keep it larger than a postage stamp so that it's easy for people to read. I've seen lots of pictures elsewhere in the forums that are just as big and don't need scrolling.)

Jay
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PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
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Re: Connectors on Printrboard

Postby Mochaboy » 2013-Jun-Thu-08-Jun

Not sure what's showing on your screen RJ - I see an image that's about 800px wide which is small enough to fit on the screen without scrolling, but large enough to make out the important details.. It also links to the larger image in case I need to zoom in.

Speaking as someone who just bought a printrbot JR - here's a big THANK YOU for contributing that diagram. Rest assured - you'll have a captive audience of at least 1 (and I'm sure more) for the next few weeks :)

For the motor pots - increase = clockwise/decrease = counterclockwise turn? Or is it vice versa?

Thanks!
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Re: Connectors on Printrboard

Postby Mochaboy » 2013-Jun-Thu-08-Jun

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Re: Connectors on Printrboard

Postby arin » 2013-Sep-Tue-09-Sep

Hi, @RetireeJay, thank you for the much needed labelled diagram of Printrboard. However, I have a few questions, the male connectors beside the processor and the ones beside the E-stop are for what purpose exactly? From what I can guess, the ones in the center of the board are probably for JTAG. In that case, I have one more question, can we actually connect the processor with the JTAG to the programming environment for some mods. I appreciate you taking out the time to label the diagram for us and a thank you in advance for giving time to my questions.
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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Sep-Tue-10-Sep

I had never heard of JTAG before, but I looked it up on Wikipedia, and it seems that you are correct. Expansion Header 1 has pins labeled with the JTAG names.
Printrboard Headers.JPG

Besides that, the headers are also used to connect daughter boards for an LCD display/controller and for expansion to two or more print heads.

You can find the schematic in PDF form in Reprap.org (wiki - Printrboard) and also in Eagle format in Github.
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GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
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Re: Connectors on Printrboard

Postby Mooselake » 2013-Sep-Tue-18-Sep

JTAG appears to be the modern equivalent of an in-circuit emulator, breakpoints, single step, and all that fun software developing stuff you can't do with an oscilloscope. Something else on my to-do list.

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Re: Connectors on Printrboard

Postby donstauffer » 2013-Nov-Sat-10-Nov

I have a problem with the Extruder connector. There are two cables that have to be plugged in here. The connector on the board is a four pin. The two cables from the extruder are both two pin, so I believe electrically everything would fit. This is, BTW, on the "simple" kit. However, the connectors on the cables have little collars that help physically grasp the connector they are plugged into. These prevent the connectors being plugged into the connector on the board. I guess I could cut them off, but the instructions say nothing about modifying the connectors, so I am reluctant to cut them off!
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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Nov-Sat-11-Nov

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Printrbot Plus operational January 2013
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GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
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Re: Connectors on Printrboard

Postby REPRAP SQUAD » 2013-Nov-Sat-12-Nov

Here's the basic layout of connections. I hope it helps to clarify a bit. I would recommend that you take pics as RetireeJay stated because that will give him exact knowledge of the situation and RetireeJay will definitely do all he can to get you setup.
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Re: Connectors on Printrboard

Postby donstauffer » 2013-Nov-Sat-17-Nov

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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Nov-Sat-17-Nov

You can post photos on this board directly. Just below the text area where you are typing your message you see a tab called "Upload attachment." Click on that tab, then click on "Browse" and select the file from a location on your computer. Click "Add the file" and then you can "Display Inline" :)
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
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Re: Connectors on Printrboard

Postby donstauffer » 2013-Nov-Sun-13-Nov

DSC_0542.JPGOkay, here are the pics I took for my problem with connecting up the extruder. The first one shows the extruder with the two bundles of wire with seperate connectors. I have resolved everything now for the heavy red wires, I found the cable with the four-pin connector. However, below is a picture of the extension for the smaller wires (the thermistor?)

Okay this is a two pin connector. The only connector left along that edge of the electronics board is labeled "hotbed" and it is a four pin connector. That two pin connector will not fit without chopping those ears off, and I am reluctant to connect it to a connector labeled hotbed.
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Re: Connectors on Printrboard

Postby REPRAP SQUAD » 2013-Nov-Sun-13-Nov

In the 1st pic: the larger red wire bundle is for your heater cartridge and the smaller clear wrapped ones is your thermistor . The white and black wire extension in the 2nd plugs into your thermistor plug on your board which is a two pin plug.
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Re: Connectors on Printrboard

Postby REPRAP SQUAD » 2013-Nov-Sun-13-Nov

If the only plug you have available is the hotbed plug them you plugged something else into your thermistor plug. It is located at the opposite end of the power plug right next to the fan plug. See diagram for proper wiring.
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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Nov-Sun-14-Nov

Don, you are on the right track. But that "4-pin" connector on the right side of the board is really two 2-pin connectors butted up against each other. One is labeled "T-EXT" and the other is labeled "T-BED." (You could interpret the "T" as being either "Thermistor" or "Temperature"; it doesn't matter. ;) )

Here is a picture with just the extruder thermistor plugged in. You can see both of the labels on the board in this picture.
ExtruderThermistorPluggedIn.jpg

And just in case you ever have a heated bed, here's what it looks like with both plugged in.
BedAndExtruderThermistorsPluggedIn.jpg

By the way, a "Thermistor" is a device for measuring temperature. The kind we use has two leads. Electrically it is a resistor whose resistance changes with temperature - "THERMal resISTOR." The Printrboard has to send a small current through the resistor in order to "sense" its resistance; the board has a built-in table of values to translate sensed resistance into equivalent temperature. It's very important for your Extruder because the temperature there needs to be controlled rather precisely. So it's in what's called a "feedback loop" where the board sends just the right amount of power to the heater to make the actual temperature match your desired temperature (the setpoint).

Another By the Way... the connectors at the Extruder end are set up with their "genders" opposite, so you can't plug power into the thermistor plug there and you can't plug the thermistor cable into the heater there. Just a little safety factor for you. :)
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
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Re: Connectors on Printrboard

Postby donstauffer » 2013-Nov-Mon-10-Nov

Thanks, Jay. The thing that was throwing me is that the photos in the instructions show to plug the thermistor into the connector right next to the one the extruder power is plugged into. By "right side" I meant right side of the edge that the first connector is on. That one along the same edge, but to the right of the extruder one is the four-pin one labeled hotbed. Your pix make it clear now, the thermistor is plugged into a connector on another edge of the board, not near the extruder connector.

BTW, this highlights a question I have on the operation of the printbots. I understand the carriage movements and the stepper motors fine. But I do not understand operation of extruder. I assume the thermistor is to maintain a given temperature of the extruder, in a feedback control loop. But what starts and stops deposition of the molten plastic? I assume there is some way the system starts and stops flow, so that it does not deposit in areas that create holes or openings.
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Re: Connectors on Printrboard

Postby RetireeJay » 2013-Nov-Mon-11-Nov

I looked at the latest Simple instructions, and I think I see the problem: besides the heater and the thermistor, there is a third device on the extruder, which is a fan. The fan cabling is the two-conductor red & black wiring that ends in a 2-pin plug. This is the "power" connection that is adjacent to the Thermistor plug - both fan and thermistor connections are on the right hand edge of the board (looked at in the orientation where the majority of text labels on the board are upright). If you go back and review steps 75 - 78 carefully I think you will see how it's intended; they did not make a mistake in the instructions but maybe there is an opportunity there for better clarity. (The heater was plugged in much earlier).

The Extrusion is controlled by the Extruder motor. If it's pushing plastic down into the Hot End, then plastic is coming out of the nozzle. When the motor stops pushing, the flow of plastic from the nozzle slows down and then stops. In fact, the Extruder motor can even "retract" to pull some plastic filament back out of the Hot End in order to reduce or stop the ooze of residual plastic from coming out.
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
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Re: Connectors on Printrboard

Postby donstauffer » 2013-Nov-Tue-10-Nov

Thanks, everyone, for the great help! I have the problem resolved and back to work on assembly.
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Re: Connectors on Printrboard

Postby gillmcil » 2015-Oct-Thu-10-Oct

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Re: Connectors on Printrboard

Postby RetireeJay » 2015-Oct-Thu-10-Oct

Yeah, some of that discussion way back when has become out of date. In fact, I have mastered re-flashing the firmware on my Printrbot, and even written up more than one guide on how to do it. (My hangup back in 2013 was not so much the physical process of doing the flashing, but rather the fact that the Marlin software is written in C++ and has dozens and dozens of files. Now I understand that almost everything that I might want to tweak is in Configuration.h and similar files.)

There are two ways of doing it (for Windows users) - either use the Arduino IDE and then FLIP, as I documented in the Wiki (the red-beige-and white button next to the "Search..." box at the top right of the Printrbottalk screen), OR use Notepad Plus Plus as your editor and as your compiler - then using FLIP to do the actual flashing. I actually prefer the latter because Notepad++ is so much better than the Arduino IDE. And you can easily link PlatformIO to a "Run" command within Notepad++, so the compilation process is only one or two clicks, just like in the Arduino IDE.

(But really, this discussion has drifted away from the OP topic: the hardware of the Printrboard. ;) )
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3, upgraded to MK3S
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Re: Connectors on Printrboard

Postby Mooselake » 2015-Oct-Thu-20-Oct

I'm not trying to sound too harsh, but posting to 2 year old topics is called necroposting. It's a lot better to start a new topic rather than posting to an old one that's sort of related.

If you can start a new topic describing how to flash with Linux it would be useful; while the vast majority of our users use Windows (please skip the Linux is better at everything argument, been there, 30+ year *nix sysadm) we do have a select few that are Linux fans and would appreciate the information.

Thanks!

Kirk
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Re: Connectors on Printrboard

Postby plexus » 2015-Oct-Tue-16-Oct

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Re: Connectors on Printrboard

Postby Mooselake » 2015-Oct-Tue-19-Oct

Linux firmware flashing techniques are not related to printrboard connectors or hardware assembly. It is, however, a useful subject that is, IMHO, worthy of being a separate new topic or a useful addition to a pertinent discussion.

This is, of course, only the humble opinion of a moose. The spamming hordes have given reviving several year old topics, even when the content is related, a bad name. They're probably the reason for the term necroposting, which I wasn't quick enough to invent. Some forums go as far as to lock topics after a while, although that's a bit extreme.

Kirk
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Re: Connectors on Printrboard

Postby RetireeJay » 2015-Oct-Tue-21-Oct

I agree with both of you. If someone was searching for content by the name of the OP, then they would never discover the software discussion in this thread. Hence, it's valid to suggest a new thread for Unix users. OTOH, I doubt anyone searches through the thousands of thread titles in this forum anymore. If it's not a "sticky" at the top of a topic area, it's probably not going to be found based on the OP title. We all use some kind of search engine. That's probably how gillmcill found this thread.

And I have seen spam "necroposting." But OTOH, sometimes a new user does discover an old thread that's very useful. For example, I sometimes refer people to the ancient thread "printing small." And if someone has something new to add to that, I'd say they are very welcome.

So basically, I wouldn't be too hard on reviving old threads, but I personally would encourage starting new topics if they are truly new. And there is a bit of a gray area when it comes to deciding "is this idea part of an existing thread, or is it a new idea"?
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3, upgraded to MK3S
User avatar
RetireeJay
My next printer is...
 
Posts: 5014
Joined: 2013-Jan-Wed-13-Jan
Location: Greenville, SC
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