This manual is a service manual for MDS-JA20ES. It provides detailed information on the machine's features and usage
This service manual covers safety precautions, self‑diagnosis functions, error‑code handling, and step‑by‑step servicing notes for the Sony MDS‑JA20ES MiniDisc player. It includes instructions for resetting the microprocessor, erasing error history, and performing hardware adjustments.
The document also contains extensive mechanical information such as disassembly instructions, exploded views, block and schematic diagrams for all sections (MD Servo, Main, Audio, Digital, Power, etc.), and a complete electrical parts list with part numbers and specifications.
| Laser output | Less than 44.6 µW |
|---|---|
| Laser wavelength | 780 nm |
| Sampling frequency | 44.1 kHz |
| Number of channels | 2 (stereo) |
| Frequency response | 5 Hz – 20 kHz |
| Signal‑to‑noise ratio | Over 102 dB |
| Power consumption | 18 W |
| Mass | 7.8 kg |
| US/Canadian power input | 120 V AC, 60 Hz |
| AEP/UK power input | 220‑230 V AC, 50/60 Hz |
Disconnect the power plug, then short‑circuit the two pins of CN703 on the BT board to discharge the backup battery.
The unit is a Class 1 laser product and exposure to the beam must be avoided when the interlocks are defeated.