Why won the RF-ON and Interlock LEDs light ?
If the unit powers up; cooling fan runs and LED meters operate (PB3-MD models only) you should verify that the interlock shorting plug is installed. The pre-wired plug provides the proper wiring to enable local RF ON/OFF operation in addition to no external interlock capability. If this plug has been re-wired; please check that the wiring scheme follows the schematic in the PB3 owner’s manual. • How long can I make the RF output cable (PB3 matching network output to sputtering source). (Models PB3-M & PB3-MD only) We suggest that a cable no longer than 5 feet in length be used. This recommendation is based on the power loss and RF matching problems that may exist with longer cable lengths. You should also plan to use a high quality Teflon coaxial cable (type RG-400 or RG-393) as it will enable high temperature operation and resist shorting better than polyethylene insulated cables. With the above said; we do believe that some customers do use long cable lengths (up to 15 feet in length
