This is to reset the toner used in Samsung ML-1666 laser printer. Based on PIC-16F73. This chip is available in Bangladesh and cheap. I bought few at taka 90 each, probably last month. So it would cost you maximum tk 200 to 250 to build one. And also easy to make. Bellow you would find the DesignSpark schematic and firmware.
* The crystal used is 8 MHz.
* Connector PL1 having:
would go to the toner’s terminal. You will find label on the toner.
* Connector PL2 having
is optional and you may skip this. This was used to debug and it has no other use.
* Connector PL3 having:
is the 5 volt power source. You can use battery or DC adapter. I have built it on stripboard
and used an old mobile phone charger. Note that new mobile phone chargers having mobile detecting IC to auto turn off may not work. I found problem with mobile phone’s charger. Using a normal adapter now.
When you power the device Led1 will be on. When the switch ‘SW1’ is pressed, it will try to check if the toner eeprom is readbale. If it is readbale, Led2 will be on and it goes to the write process. Finally if it is successful to write, Led3 will be on for a moment, then it goes to that start state again. Which is Led1 is on. At this time you may disconnect the toner and put another to reset (if any).
That’s all for now. Take care.
Note: There was an error in the previous schematic. 3 Leds were connected to pins 22, 23, 24. These 3 leds should be connected to pins 24, 25, 26. Schematic has been corrected now. Sorry for the error.
Latest Update: Firmware & schematic bugfix “resetter3.zip”: