Technical FAQ
Q1. SC06. Do you have driver of Windows 10 IOT for 3.5 inch touch screen?
A: No, we do not have.

Q2: SC06. My 3.5 inch touch screen display the default brightness and can not turn off? When I connect with the HDMI cable and run, only the command prompt appear.
A: The LCD and HDMI can not work at the same time, it needs system command to switch, please install the driver and operate according to the file: "the method of add driver for touch LDC (Raspberry pi).doc" in the below link.
https://mega.nz/#F!HUFQFDwL!fhM7RPrhbMJLsZ7ISLEr0A!aQ9w0BQb   

Q3. SC06 and SC11. It is installed necessary softwares but still not working, white screen. Is something missing? I am running OSMC (raspbmc) media center, I think it bases on raspbian.
A: This screen supports official Raspbian OS only, some OS with modified core can not be supported well. We recommend to use official OS.

Q4: SC06 and SC11. When I use your system, the screen workds perfectly, but after updateing the latest system, the white screen.
A: You need to use the command: sudo apt-mark hold the raspberrypi-kernel ( lock the core to be unchanged)
Then use the command below.
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade (do not recommend this one, the update is the latest, but not safe)
If you do not do that above, the reboot will be failed.
When it occurs the situation that the screen touch is reverse, please go the official Raspberry Pi site to download the latest Raspbian OS, then use the DRIVER 0315 in our files.

Q5: SC06 and SC11. In order to save the power, I want to turn off the backlight or make it into sleeping or screen protection, is it possible?
A: The backlight can not be turned off. The screen will enter the screen protection without touching, but lights up by touching.

Q6: SC3A. UNO R3 3.5" TFT LCD. I can not use touch function.
A: It has no touch function.

Q7: SC7J. The menu display is up side down on the screen, I checked all the OSD options and tried, but still can not solve the problem. How can I do?

A: Please turn on the screen without connecting anything, then you can see "no signal", see whether the words (no signal) reverse, if yes, press the button in the blue box, to make it normal, then when you are using OSD that would be OK.  The button is designed for the situation.


Q8: KY63. The obstacle avoidance sensor seems not working, I use the code and instruction on the CD, but it has no reaction. When put a object in front of it which always input 1 but no 0, how to make it work?
A: Please adjust the potentiometer (red arrow points to) and keep the static, then you can find sensing.



Q9: How to install Android APP for SM3 robot car, I can not find it in the APP store? I can connect it by WiFi, if I need upload a SKETCH to Arduino board or is preloaded?
A: You can find the Android App in the CD, if you can not run the CD.  The sketch was pre-loaded on the arduino board.
You can also find it in the link: https://https://mega.nz/#F!2V0mURYZ!NkSXXepdlk2C3POKj3InUQ


Q10: I assembled the SM5-1 robot car according to the manual and download the APP to iPhone, I turn on the wifi board, the phone identify the connection but the APP can not connect to it and the camera is shaking.
A: The APP need to be authorized for first time. When you use APP at frist time, you need to connect the wifi (external Wifi, such your home wifi) or the data connection of phone, then quit the APP. Reconnect the car's wifi, open the APP, that'll be ready.

Q11: K60. I bought the product and going to connect some sensors, but all the ports are used, is it possible for SPI, or DIY some ports for UNO?

A: Please refer to the pictuer to find the pins used by the screen, some free pins might be available for you, moving the jump cap to next position will be ok. The link for K47 (https://mega.nz/#F!zEVVDaRL!B3ter7RRFDJlqynquKX8Uw) is also for this product, you may find the instruction and source code there.


Q12: Does H301 hunting camera have the function "timestamp"?
A: It has, the videos and pictures will be named by time after you setting up.

Q13: SC15. One infrared LED does not work?
A: Exchange the position of them to test in the dark. The four screws must be fastened tight to keep good connection.

Q14: How is the difference between SC7J and SC7B?
A: SC7J is a small monitor with various video interface, such as VGA, AV, HDMI.
SC7B has touch function, the interface is HDMI, which can be compatible with most OS.


Q15: I am a user of K4 kit, I'd like to know how to use PROTOTYPE extension and Remote control?
A: 1. Insert the Prototype extention board to the UNO board, then link sensors with Dupont cable, which is for linking more sensors.
2. About how to use the transmitter, please refer to instructions for IR receiver in the turorials.

Q16: How to avoid to damage the box of 3.5" touch screen (SC11)?
A: Instructions for assembling: http://kumantech.com/info/assembly-instruction-of-sc11-35quot-touch-screen-with-box_i0038.html


Q17: K60. It is white screen after connecting with UNO board, same situation after rebooting.
A: Please operate according to the instruction seriously: http://kumantech.com/info/how-to-do-for-k60-white-screen_i0040.html

Q18: I installed IMAGE“5inch-RPI3-RPI2-ubuntu-mate-16.04-beta2”on my Raspberry Pi, I'd like to know the password.
A: Here it is.


Q19: My Kuman 100B 3D pen, every time I put it down, the filament keep running out. Even if I do not press any button, it occurs once the temperature is enough. It is waste of filament.
A: 1. It caused by the high temperature of the pen, set the temperature according to your environment temperature. If it is 20 degree, then set the pen at 180 degree, if 0, set as 200, the suitable temperature is between 185-210 degree.
2. Because the motor is working. Press the back glue (up side), will avoid the problem.

Q20: How to adjust the brightness and contrast of SC7B?
A: It does not support.