The RG5-6960 is a high voltage power supply board assembly for HP Color LaserJet 1500/2500 printers. It has contacts for the eight high voltage springs in the printer. These springs are used to charge the toner cartridges and transfer the toner to the paper. The RG5-6960 - HP High Voltage Power Supply Board Assembly Has Contacts for is an important component of HP Color LaserJet 1500/2500 printers. If the board fails, it can cause a variety of problems with the printer. If you are experiencing any problems with your printer, it is important to have the RG5-6960 board tested and replaced if necessary.