| Problem | Reason | Solution |
|---|---|---|
| The RED power LED is not ON | The DC power cable is not connected | Connect the DC power cable to the DC jack (see "Quick Start"). |
| Wrong power supply is used | Check that the power supply is of DC type 10-15V, min 500mA. (see "Quick Start"). | |
| The power switch is OFF | Turn on the power switch | |
| The preprogrammed example code does not toggle the LEDS | There is no AVR device in the socket | Plug the AVR device into the right socket (see "ISP Programming" and "High Voltage Programming") |
| The LEDS are not connected to the I/O ports | Connect the LEDS header to the PORTD header, and SWITCHES header to PORTB header (see "Connection of LEDs and Switches") | |
| The flash memory is erased | Connect STK500 to a PC and reprogram the AVR device (see "Programming the Target AVR Device") | |
| The AVR device can not be programmed | The PC serial cable is not connected | Connect the serial cable to the PC COM port and the RS232PROG port |
| The AVR device is inserted in wrong socket | Check the correct socket is used (see "ISP Programming" and "High Voltage Programming") | |
| The AVR device is inserted with wrong orientation | Check that the notch on the AVR socket matches the notch on the AVR device. | |
| The target ISP header is not connected | Connect the 6-pin flexible cable from ISP6PIN header to the correct SPROG target ISP header (see "ISP Programming") | |
| The jumpers settings are wrong | Set jumper to default setup (see "Jumper Settings") | |
| The VTARGET voltage is too low | Check the AVR datasheet for minimum operating voltage | |
| The memory lock bits are programmed | Erase the memory before programming | |
| AVR studio does not detect STK500 | Serial cable is not connected, or power is off | Connect serial cable to RS232PROG and check power connections |
| PC COM port is in use | Disable other programs that are using PC COM port | |
| Change PC COM port | ||
| AVR studio does not detect COM port | Disable COM port auto detection in AVR studio file menu. Force COM port to correct COM port. |
See Also