FAQ-Geeetech A20M

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FAQ-Geeetech A20M

Post by Admin » Tue Nov 13, 2018 4:45 pm

Print problems
1.If you find the nozzle no filament out
1)Check your PTFE tube plug is deep enough/Smooth
viewtopic.php?p=88482#p88482

2)Refer to this video clean your hotend
https://www.youtube.com/watch?v=evslMa5Jpc8&t=56s

3)Check the extruder motor direction is correct
If the direction of it is not correct, refer to the part of"Motor"
4)Check the spring of the feeder have enough strength/Too strength of the spring will make the filament broken
Feeder screw.png
Feeder screw.png (1.07 MiB) Viewed 13819 times
5)Clean then gear of the feeder

2.Y axis layer shift
1)Tightness the Y axis belt

2)Check the vref of the Y axis motor driver board
For A4988:0.8~1.0V is ok.
If you think A4988 is too noisy, you can replace it to TMC2208
For TMC2208:0.7~0.8V is ok.
If it allows,you'd better add the heat sink for TMC2208(It will overheat if you don't add it)
Refer to this post adjust the vref of the motor driver
http://www.geeetech.com/forum/viewtopic ... 17&t=17038

3.The extruder is very noisy A20M
1)You can add the oil to this area
Add Oil.png
Add Oil.png (1.41 MiB) Viewed 15692 times
2)You can loose a little for the screws
Loose the screws.png
Loose the screws.png (1.49 MiB) Viewed 15692 times
4.Add the purge bucket for your A10M/A20M
Refer to the link(By cmhnav Feb 2, 2019):
https://www.thingiverse.com/thing:3395883
Purge Bucket.jpg
Purge Bucket.jpg (45.49 KiB) Viewed 14027 times
Profile for Cura
http://www.geeetech.com/forum/viewtopic ... 08&t=62065


Mixer software
The mixer software is for the dual-multi mixer hotend printer.
You can edit it to single color/Gradient.

viewtopic.php?f=92&t=61760

Motor
1.Direction of motor:
How to change the motor direction in firmware?


2.Motor works abnomral
Motor’s non-action
http://www.geeetech.com/forum/viewtopic ... 17&t=17038
Check the endstop of the printer
viewtopic.php?f=17&t=60927

Drivers
Check the USB serial chip at first then :
http://www.geeetech.com/forum/viewtopic ... 974#p81974

Extruder
1.Extruder
Extruder does not work normally.

2.Nozzle type

The nozzle type of A20M is m7 thread;
(It is not the standard MK10 4mm inner diameter nozzle.You need to check it at first.The default inner diameter should be 2mm)

3.Hotend clean and nozzle replce
https://www.youtube.com/watch?v=evslMa5Jpc8&t=56s

Heatbed
1.Note:
If the heat bed won't heat,you can remove the clamps from the four corners of the heat bed


2.The heatbed thermistor datesheet
http://www.geeetech.com/forum/viewtopic ... 51&t=62055

PID tuning
Tuning refers to the parameters adjustment of a proportional-integral-derivative control algorithm used in most repraps for hot ends and heated beds.

PID needs to have a P, I and D value defined to control the nozzle temperature. If the temperature ramps up quickly and slows as it approaches the target temperature, or if it swings by a few degrees either side of the target temperature, then the values are incorrect.


https://reprap.org/wiki/PID_Tuning

Source
Schematics

Schematic for the new version Mainboard: GT2560 V3.0

The wires of GT2560 V3.0
GT2560V3 wires.png
GT2560V3 wires.png (2.69 MiB) Viewed 16332 times
Level
1.Video for 3Dtouch/Bltouch on Geeetech A20/A20M
You need to refer to this video(It is for A10/A10M but it is suit for A20/A20M) upload the firmware to it and adjust it
https://www.youtube.com/watch?v=_RtsZDbR2po&t=59s




Where to find the firmware and how to install it?
You need to upload the firmware via Arduino IDE 1.8.5(Use the 1.8.7 or higher version may cause the motor work abnormal)
http://www.geeetech.com/forum/viewtopic ... 20&t=17046
http://www.geeetech.com/forum/viewtopic ... 20&t=17181

2.For the Marlin2.x firmware(unofficial) Author:vert
http://www.geeetech.com/forum/viewtopic ... 98&t=68228

Cooling fan:
How to fixed the PWM fan problem?

Updating.....

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