描述Membrane button error.Membrane buttons are checked during startup. If any button is detected as pressed, this technical error is activated.处理1. Restart the system. Do not touch the User interface during system startup. Interfering with the knobs, keys, touch screen, loudspeaker grid, etc, may affect the internal technical tests.2. Check the User interface membrane buttons (FSS).3. Replace the Touch screen.4. Replace PC 1777 Panel