AVR STK500 User Guide 7-1
Rev. 1925C–AVR–3/03
Section 7
Troubleshooting Guide
Table 7-1. Troubleshooting Guide
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 (page 2-3).
Wrong power supply is used. Check that the power supply
is of DC type 10 - 15V, min.
500 mA (page 2-3).
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 (page 2-3).
The LEDs are not connected
to the I/O ports.
Connect the LEDS header to
the PORTD header, and the
SWITCHES header to the
PORTB header (page 3-3).
The Flash memory is erased. Connect STK500 to a PC
and reprogram the AVR
device (page 2-3).
The AVR device cannot be
programmed.
The PC serial cable is not
connected.
Connect the serial cable to
the PC COM port and the
RS232 PROG port.
The AVR device is inserted in
wrong socket.
Check that the correct socket
is used (page 3-10).
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 (page 3-10).
The jumpers settings are
wrong.
Set jumper to default setup
(page 3-15).
The memory lock bits are
programmed.
Erase the memory before
programming.
