I bought a Creality Sparkx I7 a week ago; it was shipped from the factory to my home via DHL and arrived with the box in impeccable condition. I opened it, carefully removed the printer, installed the CFS Lite unit, and took off the protective packaging—all the standard steps for a brand-new, gleaming, flawless machine.
As soon as I started it up, it notified me of a new firmware version, which I updated without any issues. Then, it ran the usual tests—bed leveling, vibration checks, etc.—and everything was perfect. I also updated Creality Print (moving from version 7.1 to 7.2.2.5483). The next day, however, it displayed error TE2762. I checked the Creality wiki (at TE2762 | Creality Wiki ) and found that, although it explicitly lists the “K2 Series/Creality Hi” as the applicable models, the procedure is the same.
I THINK is not the sensor the problem !!! today I disasembly completly the print head, I removed the circuit board and inspected all the solder joints under a microscope. Then, I removed the strain gauge and used the microscope to check the wires for damage that might have occurred when passing them through the very small retaining clips. I tested the resistive bridge (Wheatstone bridge) with a multimeter and, by applying pressure, detected a slight change in resistance (0.9 Ohm); I therefore concluded that the strain gauge and the print head’s circuit board were in good condition. Here are the measurements I took on the strain gauge connector, which is of the Wheatstone bridge type. You can see an explanation of how it works at 9.7: Galgas extensométricas - LibreTexts Español (Spanish).
Multimeter measurements show either 1 kΩ or 0.751 kΩ, depending on the points being measured.
So what the hell did I say? Hahaha. Where the hell is the problem? In the assembly? Alright, so I set about reassembling everything. On the back of the gauge, there are two holes where the heating element—along with its temperature sensor (thermistor)—connects via a thermal insulator. I noticed marks on the screws from when they were originally installed, so I respected those marks (I even kept track of the screw order and the exact number of turns—yes, I’m extremely meticulous when dismantling a unit for the first time; I’ve been doing this for 40 years). And the result was… (drumroll)… the same… 
Did you find out what was wrong? I tried tightening and loosening the screws that hold the hotend… but nothing—I kept getting that same TE2762 error… until… I removed the nozzle, put it back in, and tried various positions… and—ta-da!—I found that in one position it was a bit loose, while in another it created pressure when installed. It turns out that when you apply pressure and force with the wrench to lock it into the print head, there’s no error; it detects the Z-axis endstop perfectly, and you can run the bed leveling test without issues.
But after two prints (simple ones—just a retraction test using two colors of PLA from the same manufacturer), the annoying TE2762 error returned… I checked that the gauge connector was in good condition—specifically, that it was properly seated—and measured the resistance values on the board with the machine powered off to see if they matched the previous readings, but I didn’t get a positive result.
I contacted Creality’s personalized chat to explain the situation; after providing all the details—including the serial number and relevant images—I was told that technical support would get in touch within three days.
Has anyone else experienced this issue? If so, what solution were you offered?
