This service manual provides comprehensive technical information and repair procedures for the Kenwood KDC-138, KDC-138CR, KDC-139, and KDC-139S car stereos. It includes detailed diagrams, schematics, component descriptions, troubleshooting guides, and step-by-step instructions for dismantling, repairing, and reassembling these models. Whether you are a professional technician or a DIY enthusiast, this service manual will equip you with the necessary knowledge and tools to effectively diagnose and resolve any issues you may encounter with these car stereos.

The Kenwood KDC-138/138CR and KDC-139/139S are car stereos that were manufactured by Kenwood, a renowned Japanese electronics company known for its high-quality audio equipment. These stereos were designed to provide a reliable and enjoyable listening experience for drivers and passengers. Though precise specifications are unavailable without the actual service manual, the model names suggest that they were part of Kenwood's entry-level or mid-range offerings, catering to a wide range of car audio needs. While the exact features and functionalities may vary slightly between the KDC-138/138CR and KDC-139/139S models, they likely shared common characteristics. These could include a standard CD player for playing music discs, an AM/FM radio tuner for accessing terrestrial broadcasts, and auxiliary inputs for connecting external audio sources like smartphones or portable music players. The stereos may also have included basic features like adjustable volume and tone controls, bass and treble adjustments, and possibly a display for showing the current track, time, or station information. The service manual for these models would provide detailed technical information, including wiring diagrams, repair procedures, and component specifications, which are crucial for technicians to diagnose and troubleshoot any issues that may arise with the stereos.