Motorola RF Controller Flexible PCB for Radio Frequency Management
This is a Motorola flexible printed circuit board (flex PCB) that serves as an RF controller assembly in various Motorola two-way radio models. The distinctive orange polyimide flex circuit features multiple fine-pitch conductor traces that provide electrical connections between circuit board sections within the radio. Visible markings on the flex PCB include "E208D78G03-B" and additional identification codes. This type of flexible interconnect is designed to fold and route through tight spaces inside the radio chassis while maintaining reliable electrical connections for RF control functions. The flex PCB features multiple solder pad arrays on both ends for connection to other circuit boards.
Key Features
- Motorola flexible PCB RF controller assembly
- Orange polyimide construction for flexibility and durability
- Multiple fine-pitch conductor traces for high-density interconnection
- Visible markings: E208D78G03-B and additional identification codes
- Solder pad arrays on both ends for board-to-board connections
- Designed to route through confined spaces within radio chassis
- Critical component for RF signal control and management
Important Replacement Information
- Original part number 8404078G03 has been superseded by 8404078G05
- While supplies of 8404078G03 last, this original version remains available
- Part number 8404078G05 is the current replacement when 8404078G03 stock is depleted
Compatible Models
- Various Motorola two-way radio models (consult service documentation or parts diagram for specific compatibility)
What's Included
- One (1) Flex PCB RF Controller Assembly
Application & Installation
This flexible PCB RF controller is a specialized component that requires professional installation by a qualified radio technician. Flex PCBs are delicate and can be easily damaged by improper handling, excessive bending beyond their designed flex radius, or contamination from oils and debris. Installation involves complete radio disassembly, desoldering of the failed flex PCB from multiple connection points, careful routing of the new flex circuit through the radio chassis following the original path, soldering to the appropriate circuit boards with proper heat control to avoid damaging the polyimide substrate, and verification of all electrical connections. Replacement is necessary when the flex circuit develops broken traces due to fatigue from repeated flexing, cracks from excessive bending, contamination damage, or solder joint failures. Because this component handles RF control functions, improper installation can result in transmit or receive problems, reduced performance, or complete radio failure. After installation, comprehensive testing is required to verify proper RF operation. This repair demands expertise in working with flexible circuits, precision soldering skills, proper handling techniques to prevent electrostatic discharge damage, and access to service documentation showing the correct routing path. Due to the complexity and delicate nature of flex PCB replacement, this work should only be performed by experienced technicians with appropriate tools and training.
Manufacturer Part Number: 8404078G03
Replaced By: 8404078G05 (when 8404078G03 stock is depleted)
PCB Marking: E208D78G03-B
Availability: While supplies last
