I think the problem is with the electronics, as I tested the stepper motor with the second extruder’s driver and it works fine. Extruder 2 is working perfectly, but when I plugged the connector from extruder 1 into extruder 2, the same problem occurs: the motor keeps “jumping” in the same place. Has anyone else had this kind of problem? I appreciate any help, thank you.
Hello Carlos,
according to your problem description it seems like an electronic problem with your left extruder.
In order to locate the problem source:
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Have a deep look at the SV04 pinout, concentrate on the wiring of left extruder.
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Unplug the power cable of your SV04.
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Locate the left gantry breakout board & unplug the plug from connector “E”.
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Use a multimeter to ensure electrical connectivity of each of the four cables from the plug to the stepper motor plug.
=> In case of a missing connection you’ll need to repair/replace the cable between breakout board and stepper motor. -
In case the above connection is working: Unplug the breakout board completely & visually inspect it for mechanical cracks, broken wiring and cold solder joints at connector “E” & at pins 01, 02, 16, 17 of ribbon cable connector P1 & the connections between them. Use a multimeter to ensure electrical connectivity between pins 01, 02, 16, 17 and the pins of connector “E”.
=> In case of a missing connection you’ll need to re-solder/repair or replace the breakout board. -
In case the gantry breakout board is working: You’ll need to open the bottom housing of your SV04. Be careful not to crash both extruders when you turn your SV04 to the side.
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Re-plug the left ribbon cable into the left gantry breakout board. Unplug the left ribbon cable from motherboard connector “P3”.
Use a multimeter to ensure electrical connectivity between pins 01, 02, 16, 17 of the ribbon cable and the pins of connector “E” on the left gantry breakout board.
=> In case of a missing connection you’ll need to repair/replace the ribbon cable. Alternatively, you could change left and right ribbon cables & check for electrical connectivity again. -
In case the ribbon cable is working: Locate the trimmer resistor RP6 of the left extruder stepper motor driver on the motherboard. It is next to the imprint “E1”. This trimmer adjusts the motor current of the left extruder stepper motor. Compare its adjustment with trimmer resistor RP7 (right extruder stepper motor driver “E2”) and the other trimmer resistors in the same row. In case of a big difference: Use a small skrewdriver & adjust RP6 equally. In case of no difference: Use a small skrewdriver, adjust RP6 back & forth. Then adjust it to its previous position.
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Reconnect all plugs, put together all parts & test your SV04 again.
In case the problem is still present: Use a multimeter to measure voltage between the extruder motor connector pins. There should be two pairs of wire up to 24V DC when the extruder is powered up not moving and up 24V AC when turning.
In case of voltage present on both wire pairs: Raise the extruder motor current by carefully adjusting RP6 on the motherboard. Be sure to raise slowly iot avoid burning the motor driver.
=> In case of missing voltage: It seems that you’ll need to replace the TMC2209 motor driver and/or surrounding components on the motherboard. This will result in a motherboard replacement, if you’re not used to solder SMD-boards…
Good luck!
Björn
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Hi Björn,
Thank you so much for the detailed email. It was very helpful!
I discovered that one of the E-connector cables (which goes to the filament stepper motor) was broken.
I have no idea how it happened, but it was easy to fix. Thank you so much again. Carlos
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