This comprehensive service manual provides detailed instructions and technical specifications for the Marantz PMD680 and PMD690 portable PC card recorders. It includes in-depth information on troubleshooting, repair, and maintenance procedures for these popular audio recording devices. The manual covers various aspects, including circuit diagrams, component identification, alignment procedures, and fault diagnosis. With its detailed illustrations, step-by-step instructions, and technical specifications, this service manual empowers technicians and audio professionals to effectively diagnose, repair, and maintain the PMD680 and PMD690 recorders. It covers every aspect of the device's functionality, from its internal circuitry to its external connections, making it an invaluable resource for anyone involved in servicing these recorders.

The Marantz PMD680 and PMD690 are compact, portable audio recorders designed for professional and semi-professional use. These recorders were introduced in the late 1990s as part of Marantz's line of high-quality recording equipment and were known for their reliability and advanced features. The PMD680 and PMD690 offered a combination of portability, ease of use, and professional recording capabilities, making them suitable for a wide range of applications, including journalism, broadcasting, music recording, and more. Both models shared a similar design, featuring a compact, robust metal casing with a built-in microphone and a variety of inputs for connecting external microphones and other audio sources. Internally, they utilized PCMCIA (PC Card) slots for storing recordings on removable PC Cards, offering flexibility and convenience for data management and transfer. The PMD680 and PMD690 also offered a range of features designed for professional audio recording, including built-in stereo microphones with adjustable sensitivity, a variety of recording modes to optimize audio quality for different applications, and a manual level control for precise audio adjustments. They also provided timecode functionality for synchronizing recordings with other equipment, making them ideal for multi-track recording and post-production workflows.