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Technical parameters for FM tuner performance, including sensitivity and frequency response.
Technical parameters for AM tuner performance, including sensitivity and signal-to-noise ratio.
Detailed schematic of the NAD C427 main circuit board, showing component interconnections.
Component placement and routing for the main board's top and bottom layers.
Comprehensive list of electrical components for the main circuit board, including part numbers and descriptions.
Bill of materials for the C427 unit, detailing parts, part numbers, and quantities.
Technical parameters for FM tuner performance, including sensitivity and frequency response.
Technical parameters for AM tuner performance, including sensitivity and signal-to-noise ratio.
Detailed schematic of the NAD C427 main circuit board, showing component interconnections.
Component placement and routing for the main board's top and bottom layers.
Comprehensive list of electrical components for the main circuit board, including part numbers and descriptions.
Bill of materials for the C427 unit, detailing parts, part numbers, and quantities.
The NAD C427 is a Digital Media Tuner, designed for receiving both FM and AM radio broadcasts. This service manual provides comprehensive details for its maintenance, repair, and understanding of its internal workings.
The NAD C427 primarily functions as a high-quality radio tuner, capable of receiving both FM and AM signals. It incorporates RDS Decode Sensitivity for FM, which allows it to display additional information broadcast by FM stations, such as station name, program type, and song title. The device is built around a main MCU (M30281FAHP) which handles overall control, and a VFD Driver MCU (PIC18F26K20) for managing the Vacuum Fluorescent Display (VFD). The tuner module itself is a KUANGXIN FM/AM/RDS MODULE (kst-mb114ma1-23), indicating a dedicated, integrated component for radio reception. Power is supplied by a main PSU providing +/-12V and +8V, and a standby PSU for low power consumption. The device features an encoder board for user input, a front panel with key and IR input, and an RS232 port for potential external control or diagnostics.
FM Section:
AM Section:
The device operates with a crystal frequency of 18.432 MHz. Its power supply unit (PSU) is designed for low standby power consumption (<0.2W dissipation).
The NAD C427 is designed for straightforward operation, featuring a front panel with key and IR input for user interaction. An encoder board likely provides rotary control for tuning or menu navigation. The Vacuum Fluorescent Display (VFD) offers clear visual feedback of station information, settings, and RDS data. Connectivity includes FM and AM antenna inputs, as well as stereo RCA outputs (LO and RO) for connecting to an amplifier or receiver. An RS232 socket (D Connector 9) suggests the possibility of integration into a larger control system or for firmware updates/diagnostics. The presence of a USB connector (CON208) on the FPP board indicates potential for media playback from USB devices or for service-related functions. The device also includes a "Power ON" button and LED indicators (Red, Amber, Blue) for status.
The service manual provides detailed information crucial for maintenance and repair:
The inclusion of specific part numbers and detailed descriptions for each component, along with clear diagrams, makes the NAD C427 highly serviceable. The standby PSU's low power dissipation is also a maintenance-friendly feature, indicating efficient design and potentially longer component lifespan due to reduced heat.
General| Brand | NAD |
|---|---|
| Model | C427 |
| Category | Car Receiver |
| Language | English |
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