The power supply filter in a 196/296 496/596 controller's power supply unit needs replacement.
Other, Satchwell Sigma
The power supply filter has gone bad.
The power Supply Filter used is a Tyco-Corcom type 2VK1. RS Components order code 2509234656.
Note: This must only be replaced with that exact part number. No "near equivalent" is allowed for safety and performance reasons.
Click here to view the Data Sheet for the Tyco-Corcom type 2VK1.pdf.