Jerry wrote: Working on K2 (sn4011). Finished the control board tonight. Did final resistance checks and one is not right. U4 out (8V) should be 3 - 7K ohms. The meter cycles like a capacitor is charging and discharging back and forth. Any thoughts? Jerry, I know that device has built in current limiting, so I would check real good for any solder bridges. Jim W4ATK