Philips 77921-40540 Function Membrane for Sonos Ultrasound

The Philips function membrane is a service part designed for Philips ultrasound systems. The verified product information available in our catalog is summarized on this page to support part identification, fitment checks, and procurement.

• Designed and catalogued as a function membrane for Philips ultrasound systems.
• Listed for use on Philips Sonos 2500, Sonos 4500, Sonos 5500 consoles.
• Manufacturer part reference on file: 77921-40540.
• Catalogued as a Philips service / replacement part suitable for preventive maintenance.
• Catalog category: Ultrasound u00bb Parts.

Listed compatible platforms include: Philips — Sonos 2500, Sonos 4500, Sonos 5500. Each candidate console should be verified against the part reference before ordering.

Ultrasound-console key mats are typically molded silicone or rubber overlays with printed legends, mounted over a snap-dome or membrane-switch PCB. Common failure modes include lost tactile response, cracked silicone around high-use keys (freeze, store, print), and fading of the printed legend. Replacement membranes are matched by console / control-panel part reference; OEM-style parts preserve the original key layout and legend set.

• 1× Philips 77921-40540 Function Membrane for Sonos Ultrasound
• Product identification / part reference label

• Verify the part number and model fitment against your unit's documentation prior to purchase.
• Product images and descriptions are for reference; the appearance of the actual item may vary by production batch or revision.
• If you are unsure about compatibility, contact our support team with your system model and serial number.
• Cross-check the on-unit part marking against the catalog part reference before installation.
• Installation should be performed by qualified service personnel following the original manufacturer's guidance.
• Where the part interacts with patient-contact or measurement-critical subsystems, validate the system against the manufacturer's service procedure before returning it to clinical use.

SKU/Link Reference: Philips77921-40540FunctionMembrane