JYE Tech Forum

Well done!
This kind of kit is intended to be a learning experience, maybe you got more than you bargained for.
Now you can think about upgrading the firmware, there is discussion of why and how in earlier posts.

Yes, you have the right position for pin 10. The pin 1 side of U2 is marked by a bevel running the whole length of the IC package. It's not hard to see when you know what you are looking for. I am having trouble understanding how all the resistors measure correctly and R6+R7+R8 is correct yet the re...

Open means no connection. Most likely there is a bad solder joint on one end of R8. If you measure resistance from ground to R7 you should get either 120 ohms or 300 ohms, depending on which end you chose. You can check the operation of the switch by measuring from U2 pin 10 to ground. It should be ...

I see in your 2nd and 3rd photos the 3.3 volt test signal appears to be 16 volts. 5 volts/division times 3.1 divisions = 16 volts. R6, R7 and R8 divide the signal by 5 when the switches are set for 5 volts per division. If R8 is open the signal would not be divided and would appear be 5 times higher...

Yes V2 and TP3 are the same point. I assume you have checked the power supply voltages and found them to be correct. Pin 10 of U2 (+ input) will measure 0 volts when the coupling switch is set to GND. If that section of U2 is functioning Pin 9 (- input) will also measure 0 volt. That's how op amps w...

These steps should get you a trace. Verify the voltage at TP3 is about 1.6V Set the trigger mode to AUTO Do the VPos Alignment procedure found in the instructions. Vpos Alignment This is to fix the mismatch between 0V trace and VPos indicator. To do this set couple switch [CPL] to GND position. Pres...

I assume you have removed the LCD screen so you know it's not at fault. If you are very lucky the problem is just a solder short some where on the board. Look at the schematic and carefully check all the places the V3.3 goes. Reheat the pins on the header connectors (J3, J6) and through hole compone...

It is important that those capacitors are installed as shown in the picture in the assembly manual with the beveled end of the part matching the bevel in the silkscreen. When properly installed the rotor of the capacitor will be connected to ground. Your screwdriver touches the rotor when you are ad...

I have the feeling you are going to need this for U5, maybe others.
https://www.youtube.com/watch?v=FTQqjggeklo
It really works.

Hello NatNieuw, It would take a lot of modification to properly correct the scope's poor input circuit. Just adding the relay wouldn't result in the right input capacitance. Also it would add to the current consumption which would reduce battery life. Here is a link to a DIY 100:1 probe. http://how-...