![]() These 3 leds should be connected to pins 24, 25, 26. 3 Leds were connected to pins 22, 23, 24. Note: There was an error in the previous schematic. At this time you may disconnect the toner and put another to reset (if any). Finally if it is successful to write, Led3 will be on for a moment, then it goes to that start state again. If it is readbale, Led2 will be on and it goes to the write process. When the switch ‘SW1’ is pressed, it will try to check if the toner eeprom is readbale. When you power the device Led1 will be on. I found problem with mobile phone’s charger. Note that new mobile phone chargers having mobile detecting IC to auto turn off may not work. I have built it on stripboard and used an old mobile phone charger. This was used to debug and it has no other use. Bellow you would find the DesignSpark schematic and firmware. So it would cost you maximum tk 200 to 250 to build one. I bought few at taka 90 each, probably last month. This chip is available in Bangladesh and cheap. This is to reset the toner used in Samsung ML-1666 laser printer.
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