AVR Fusebit Doctor Reads uC Signature but fails to verify Write/Reset Fuse.!!!
I built Atmega Fusebit Doctor from last update Firmwire v2.11 Board V2h on PCB. Atmega8A as Doc Chip
Whenever I put my bricked (Due to wrong external clock fuse setting) Atmega8A uC into fusebit doctor's socket the green led blinks for about 1 seconds and then red led flashes.
I got the following info in the terminal from Doctor;s RS232 output. I tested with another brand new Atmega8A chip but the same thing happens. I checked the PCB board. No shorts or bugs found on any lines. Measured both 12V and 5V on patient uCs Reset and VCC pin which applies accordingly during operation and found all transistors OK. Don't know whats wrong?
NB: I built Atmega Fusebit Doctor for the first time about 10 years ago but that time everything worked fine and I recovered couple of Atmega uCs but somehow I lost that PCB board with everything while migrating to another city and forgot exactly which firmware version I used.
========================================================
For the bricked Atmega8A uC I get following info
========================================================
Welcome
AVR Atmega fusebit doctor (HVPP+HVSP) version 2.11
http://diy.elektroda.eu/atmega-fusebit-doctor-hvpp
Usage in commercial/profit purposes not allowed
MANUAL HVPP MODE
Init programming... DONE
Read signature... 1E 93 07
Searching chip... no names in 8kB ver
Read fusebits... L:87 H:99 E:00
Should be... L:E1 H
9 E:00
Lockbits... DISABLED (BF)
What to do?...
1 - write fusebits
2 - modify fusebits
3 - set lockbits
4 - chip erase
5 - end
Writing E1 D9 00... DONE
Verifying... L:04 H:04 E:00- FAIL!
Please try again...
====================================================================
For new Atmega8A got the following info:
====================================================================
Welcome
AVR Atmega fusebit doctor (HVPP+HVSP) version 2.11
http://diy.elektroda.eu/atmega-fusebit-doctor-hvpp
Usage in commercial/profit purposes not allowed
MANUAL HVPP MODE
Init programming... DONE
Read signature... 1E 93 07
Searching chip... no names in 8kB ver
Read fusebits... L:A1 H:99 E:00
Should be... L:E1 H9 E:00
Lockbits... DISABLED (BF)
What to do?...
1 - write fusebits
2 - modify fusebits
3 - set lockbits
4 - chip erase
5 - end
==================================================
AI: Can you provide details about the exact components you used in your build (e.g., transistor types, oscillator/crystal, and whether you made any substitutions from the original BOM)?
No change, No substitution from the original BOM
AI: What kind of power supply are you using for the Fusebit Doctor (voltage, current rating, and whether it’s regulated or has any noticeable ripple)?
Transformer based 12V 1A DC regulated power supply through L7812 IC. Also used 12V DC 1A Travel Adapter.
I built Atmega Fusebit Doctor from last update Firmwire v2.11 Board V2h on PCB. Atmega8A as Doc Chip
Whenever I put my bricked (Due to wrong external clock fuse setting) Atmega8A uC into fusebit doctor's socket the green led blinks for about 1 seconds and then red led flashes.
I got the following info in the terminal from Doctor;s RS232 output. I tested with another brand new Atmega8A chip but the same thing happens. I checked the PCB board. No shorts or bugs found on any lines. Measured both 12V and 5V on patient uCs Reset and VCC pin which applies accordingly during operation and found all transistors OK. Don't know whats wrong?
NB: I built Atmega Fusebit Doctor for the first time about 10 years ago but that time everything worked fine and I recovered couple of Atmega uCs but somehow I lost that PCB board with everything while migrating to another city and forgot exactly which firmware version I used.
========================================================
For the bricked Atmega8A uC I get following info
========================================================
Welcome
AVR Atmega fusebit doctor (HVPP+HVSP) version 2.11
http://diy.elektroda.eu/atmega-fusebit-doctor-hvpp
Usage in commercial/profit purposes not allowed
MANUAL HVPP MODE
Init programming... DONE
Read signature... 1E 93 07
Searching chip... no names in 8kB ver
Read fusebits... L:87 H:99 E:00
Should be... L:E1 H
9 E:00
Lockbits... DISABLED (BF)
What to do?...
1 - write fusebits
2 - modify fusebits
3 - set lockbits
4 - chip erase
5 - end
Writing E1 D9 00... DONE
Verifying... L:04 H:04 E:00- FAIL!
Please try again...
====================================================================
For new Atmega8A got the following info:
====================================================================
Welcome
AVR Atmega fusebit doctor (HVPP+HVSP) version 2.11
http://diy.elektroda.eu/atmega-fusebit-doctor-hvpp
Usage in commercial/profit purposes not allowed
MANUAL HVPP MODE
Init programming... DONE
Read signature... 1E 93 07
Searching chip... no names in 8kB ver
Read fusebits... L:A1 H:99 E:00
Should be... L:E1 H
9 E:00
Lockbits... DISABLED (BF)
What to do?...
1 - write fusebits
2 - modify fusebits
3 - set lockbits
4 - chip erase
5 - end
==================================================
AI: Can you provide details about the exact components you used in your build (e.g., transistor types, oscillator/crystal, and whether you made any substitutions from the original BOM)?
No change, No substitution from the original BOM
AI: What kind of power supply are you using for the Fusebit Doctor (voltage, current rating, and whether it’s regulated or has any noticeable ripple)?
Transformer based 12V 1A DC regulated power supply through L7812 IC. Also used 12V DC 1A Travel Adapter.
