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Section 3
Troubleshooting Guide
Figure 3-1 . Troubleshooting Guide
Problem
The Green “Power-ON”
LED is not on
Reason
No power supply
Solution
Verify the power supply source level
Verify the power supply source selector
STK526 does not work
STK500
Configuration not
respected.
The AVR ISP probe is
not connected
Connect the DC power supply source, or
USB interface or STK500.
Connect ISP cable between STK500 and
STK526. Check Parallel Programming
hardware configuration on both STK500
and STK526.
Connect the AVR ISP 6-PIN header to
the correct STK526 ISP header (page
19). Take care of polarity.
The AT90USB82/162
cannot be programmed
AVR Studio does not
detect the AVR tool used
The AVR JTAG ICE
probe is not
connected
The memory lock bits
are programmed
The fuse bits are
wrongly programmed
Programming too fast
with ISP SPI
RS232/USB cable is
not connected, or
power is off
PC COM port is in
Connect the JTAG ICE 10-PIN header to
the correct STK526 JTAG header (page
19). Take care of polarity.
Erase the memory before programming
Check the fuse bits (SPIEN, DWEN if
previous operation was debugging).
Check oscillator settings and make sure
it is not set higher than SPI clock
Connect the RS232 cable (STK500 -
AVR ISP) and check power connections
Connect the USB (JTAG ICE MKII, AVR
ISPmkIIl) and check power connections
Disable other programs that are using
PC COM port.
use
Change PC COM port
STK526 rev. B Hardware User Guide
AVR Studio does not
detect COM port.
Disable COM port auto-detection in AVR
Studio file menu. Force COM port to the
correct COM port
3-26
7709B–AVR–07/08
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