Help! Anyone with a Sovol Zero toolhead

Sovol Zero
1

I need someone to probe continuity on their zero toolhead mcu between the thermistor connector/solder pad labeled “TH” and the toolheads MCU small SMD resistor on the back side of the toolheads MCU labeled “R26” and tell me if one side of the R26 resistor does in fact read continuity. This is so I can fix a broken trace/lifted solder pad. It got torn up so bad I can’t confirm continuity using the trace anymore (it’s not reachable). Trying to fix my thermistor connector on the mcu.

PLEASE NOTE: If you do help me. MAKE SURE THE TOOLHEAD MCU IS NOT POWERED BY ANYTHING WHEN PROBING CONTINUITY AS IT COULD POTENTIALLY SHORT YOUR MCU OUT

2

A couple users have replaced toolhead boards under warrantee. A request for a close up photo would be very much more likely to get a result.

Post a picture of your board as a guide to which side of which board you need.

FWIW MKS designs and builds Sovol’s boards. Their generic THx schematic looks like this:

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In this schematic R56 is the pull up resistor which we know is 11,500 Ohms

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If your R26 is any other value (I bet it is 1k) then it connects directly to the MCU. Also verify resistance from the plug to Vref is 11.5k

The filter cap is nice to have but not mission critical.

3

Hey man, thanks a lot. So I can’t measure the resistance confidently because the trace is ripped out but I did manage to get a reading using some very thin needle like probes to find R26. The value was 11.5k resistance on the opposite solder pad from the pad and trace that goes back to the STM32. I managed to solder a jumper and actually got it back up and working. Basically swapped my sv08 toolhead for a zero toolhead but my zero thermistor broke so I modified it some more and successfully have an sv08 flowtech hot end running on the zero toolhead with repaired TH trace on my sv08