Troubleshooting How do I use the trimmer of my Philips shaver Using the trimmer of your Philips shaver is easy. Just follow the steps below. Using your trimmer For maximum visibility, pull the shaving unit straight off the shaver. Press the trimmer slide forwards to slide out the trimmer. Press the ON/OFF button to start trimming. When you are finished, switch off the shaver. Clean the trimmer under the tap. Press the trimmer slide backwards to retract the trimmer.