Samsung CLP-310 CLP-315 Reset

If you have a Samsung CLP-310 or CLP-315 you have probably already looked around how to reset the memory of the cartridges.

Refilling the cartridges and replacing the chips in one method, but a messier and more elaborate approach is to get right to the main board.

Look for U1 Amtel 24C64 a 32K EEPROM memory which is written to each time you print a page, and makes the default cartridges unusable after a number of prints regardless of what quantity of toner is left in them.

Before you start changing things you may want to take the measurements of components that may be removed if you have to remove the EEPROM.

For example
U1 24c64
Resistor Values
R1 2.0k Ohm
R2 2.0k Ohm

If you are still on the default cartridges and have no less than 300 pages left per color (CYMK), you can change the connections of U1 : Unsolder pin 7 and bind it to pin 8. This will write protect U1 preventing the printer from writing the number of prints, thus allowing you to refill your original cartridges.

If you are equipped with a PIC programer, you can get the original programming image from the 24c64 according to your firmware ie 1.29.11.52 or 1.29.01.17 then reprogram the chip. I believe there is a service port on the back of the printer, however you may have to be sure of the connections. Otherwise you can remove the chip, solder it to a board ( the pins are too fragile to solder wires to it) reprogram it then solder it back on.
I've read some posts where connections from the programmer were just soldered on to the pin's leads that may be safest : you reduce the risk of ripping out the traces on the circuit board.