Check the leaf switches near the battery compartment and the AC transformer primary winding.
Before diving into repairs, it helps to understand what the D6920 Mk2 is capable of. This model was a significant upgrade over the original D6920, featuring improved head designs and more robust internal components. Standard 4.76 cm/s. Philips D6920 Mk2 Service Manual
According to the service manual, regular maintenance prevents most common failures. If your unit is struggling, focus on these three areas first. 1. Belt Replacement Check the leaf switches near the battery compartment