I'm porting Marlin to my Qidi Tech 1 and I'm trying to figure out what part this is. The markings on it read "AAJU". I'm pretty sure its the digital pot to adjust the stepper drivers as there isn't a small adjustable pot on them.
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The picture shows, that the marked chip is next to the letters
U12. U is commonly used for Ineparable Assembies, but there are several meanings possible according to the ANSI/IEEE Std 315 (1975). So, let's assume for the moment that this is
Assembly 8 to 12.
Note that the X-pot is marked to be down on the right side of each section, right under the sockets, and next to
The Marking AAJU might belong, according to this reference, to two chips. Both are Voltage uP Supervisory Circuit
AAJU MAX6339AUT MAX6339 SOT23-6 Quad Voltage uP Supervisory Circuit AAJU MAX6726KASYD3 MAX6726 SOT23-8 Triple Ultra-Low-Voltage uP Supervisory Circuit
The pinout and look of the first chip is very much in line with what I see from the photo:
Sadly, neither a user manual for the board nor the pinout of it seems to be available at the time. My best guess based on these facts is, that it is the Quad Voltage supervisory chip, as the MAX6726 has 8 legs, as the
-8 in the entry