Screws are tight.

To prevent stripping damage, you need Phillips screwdrivers of #1 and #2.

When Rapiro is turned on, the legs are not holizontal, the arms are up or waist is twisted.

You might not have done the initial adjustment of servo angles. You can see how to do it on #53 of the assembly manual. If you didn't do it, you need to disassemble Rapiro and start assemble from the process of #53.

When Rapiro is turned on, servo motor makes buzzing sounds.

You might not have done the adjustment of the angle of the servo motor's axis. You can see how to do it on #204 of the assembly manual.

The servo motor still makes small buzzing sounds.

Buzzing sounds could be small enough so that you are not to be annoyed by the sound. But it's not easy to remove the buzzing sound completely.

When Rapiro is turned on, Rapiro acts strangely.

Power supply might be not enough. Please refer to the information of power supply.

PC doesn't recognize Rapiro controller board.

Some micro USB cable is designed for recharging cellar phones. Those are made only for power supply. Please use USB cable which has ability of transferring data.

When some modules like camera, WiFi, bluetooth or so on is attached, Raspberry Pi is turned off.

If some modules were attached to Raspberry Pi and power was supplied by GPIO from Rapiro controller board, power supply might not be enough to run Raspberry Pi. In this case, you might want the Raspberry Pi to have different power supply other than the GPIO.

Rapiro is not working correctly with Raspberry Pi.

If Raspberry Pi is connected to Rapiro controller board via GPIO, you might want to disable the serial console of Raspberry Pi. There is script to disable serial console for instance.