Based on the part number format **1-855-XXX-XX**, this typically refers to components manufactured or sourced by **Sony Corporation**. These are proprietary part numbers used in the service manuals of consumer electronics like televisions, audio systems, and cameras. ### Common Categories for 1-855 Series Parts In the Sony parts ecosystem, the "1-855" prefix is frequently associated with **Transformers** and **Inductors**. Below is a breakdown of common types: | Part Number Example | Component Category | Typical Application | | :--- | :--- | :--- | | **1-855-034-11** | Switching Transformer | Power Supply Units (PSU) | | **1-855-121-11** | Ferrite Core / Choke | EMI/RFI filtering on signal lines | | **1-855-582-11** | Pulse Transformer | Data transmission or gate driving | | **1-855-9XX-XX** | Specialized Inductors | High-frequency tuning circuits | --- ### Technical Specifications & Roles 1. **Switching Transformers:** * Found in AC-DC converters. * They step down high-voltage AC to low-voltage DC required for logic boards. 2. **Noise Filters (Chokes):** * Used to prevent electromagnetic interference (EMI). * Essential for meeting regulatory standards (FCC/CE). 3. **Isolation:** * Many parts in this series provide galvanic isolation to protect the user from high-voltage shocks. ### How to Identify Your Specific Part To find the exact specifications for your specific "1-855-R" part (where R represents the remaining digits), you should: * **Check the Service Manual:** Look for the specific model number of the device (e.g., Sony KDL-XXXX). * **Inspect the Marking:** Often, the physical part has a manufacturer code (like *Delta* or *Murata*) in addition to the Sony internal part number. * **Measure Values:** If the part is an inductor, use an LCR meter to check the Henries (H) and internal resistance (Ω). --- ### Comparison: OEM vs. Generic | Feature | Sony 1-855 Series (OEM) | Generic Equivalent | | :--- | :--- | :--- | | **Tolerance** | High Precision | Standard | | **Form Factor** | Proprietary Footprint | Standardized (DIP/SMD) | | **Availability** | Sony Service Centers | Electronic Distributors (DigiKey/Mouser) | ---