I received the E1 error and noticed that a wire had broken off of my Heater Cartridge and needed to be replaced. I replaced the heater cartridge successfully and checked the connections through the wiring harness by using my multimeter. All connections gave me a “connection tone” through the entire wiring harness to the carriage. I connected the tool head to carriage. I ensured that I had the proper firmware flashed on the TAZ Pro S and properly selected the M175v2 toolhead on the screen. The cartridge is not heating when I do a temperature check. I tested the thermistor by using my torch to lightly heat the heater block and it is functioning properly as the heat goes up quickly and back down slowly.
I decided to attach my M285 Dual Extruder to check the carriage and the remaining connections. I flashed the firmware with the correct settings for the Dual Extruder, selected the proper tool head on screen and did a temperature check on both extruders. All is working properly.
I removed the Dual Extruder, flashed the firmware and selected the M175v2 toolhead on the screen. Same E1 error. I checked the heater cartridge wires for tone and all was properly connected.
What are my next troubleshooting steps?
Thank you!
Buckstop1
Check your harness for the M175v2. If both heaters in the the dual are working, wiring all the way to the back of the carriage is fine.
You may have put the heater’s power connection in the wrong pin in the harness, or the pin is not fully inserted into the harness. These molex connectors can be tricky to get right.
I checked both wiring harnesses on the M175v2 toolhead and received a connection tone through all of them. I checked the fuses on the motherboard and all are good.
Plugin the Dual Extruder, flash the firmware for the M175v2, and then change the toolhead. If you change the toolhead first then the firmware is upset because the second extruder thermistor is missing and this causes the firmware update to fail.
A 100K ohm resistor across the pins for the second extruder thermistor also works (https://forum.lulzbot.com/t/dual-extruder-dummy-plug-for-second-connector/5946)
If it’s shorted somewhere in there, you’ll still get a connection tone.
The older firmwares would fail to start up if it was dual firmware without a signal from a thermistor. I don’t think this is the problem here.
But you do bring up a good check - plug in the dual toolhead, with the M175v2 firmware, and test that it heats up fine.
Everything here is pointing to the M175v2 being damaged when the wire broke off, or a bad install of the new heater cartridge wiring. If that wire broke off while it was running and touched the body of the nozzle, and it sent 50w of power through the body of the toolhead, who knows what could have been damaged before the thermal runaway protection shut the machine down.
My dual extruder is 2.85mm. Will that matter?
Nope. All you’re doing is plugging it in and telling it to heat up, you don’t need to extrude anything.
Dual extruder heated up just fine. What are my next steps?
I’d start checking for a short in the wiring.
I decided to try and do some printing with my Dual Extruder while I was troublshooting the M175v2 toolhead. I flashed the firmware and had it properly set for the dual extruder. I started the bed leveling sequence and it failed to register contact on the first leveling washer. I immediately turned off the printer.
I checked my fuses are all three are good.
could I have a problem with my toolhead carriage?
If it shorted out, the small board on the carriage could have been toasted.
Schematics for testing connections are here: Index of /TAZ/TAZ_Pro/v1.0.7/production_parts/electronics/extruder_interface_board/KiCad_Files
Ok. I took off the card from the carriage and disconnected the wiring harness going to the motherboard. I connected my m175v2 to the card and checked all of the connections for the heater block, heater cartridge, thermistor and ground and got connection tone on all the appropriate connections. Now what?
Thank you for the schematics, by the way! Tremendously helpful!
This morning I decided to take a chance and attempt to heat the tool head. IT HEATED UP!. I then fully attached the M175v2 to the carriage. I then tried to do a bed leveling and it failed by not recognizing the tool head touching the leveling washer. What should I be checking?
Edit: Got things backward, removing so bad information is gone.
Thank you for the detailed instructions and illustrations. I have continuity between washer and ZMIN at the board and also between the nozzle and pin#3 at the harness.
When I check between pin#3 and +5v source on the board, I detach the wiring harness at the board. I get continuity tone from pin#3 to the wiring harness which connects to the board on the black and the blue wires only. I get nothing from Red or White. Am I using the proper method to check these wires?
Edit: Got things backward, ignore this one.
Sorry, I got everything flipped backward in my head for some reason.
Ok, so the Z min pin on the board sends its own 3.3v signal. When that signal is grounded, it triggers Z min. It sends +3.3v from the Z min connection on the board, through the washers, and the nozzle is connected to ground through pin #3.
