Do you have a question about the Sony Discman D-121 and is the answer not in the manual?
Record model and serial numbers for future reference and dealer inquiries.
Critical warnings regarding fire, electric shock, eye hazard, and qualified servicing.
Details on Class B digital device compliance and potential radio interference.
Notices for UK (Class 1 Laser Product) and Canada (Radio Noise Regulations).
Instructions for inserting, using, and replacing AA batteries correctly.
How to connect the unit to mains power using the supplied AC adaptor.
Key points on battery polarity, mixing types, leakage, and long-term storage.
Understanding the low battery indication and estimated play time.
Guide to using car accessories for listening to CDs in a vehicle.
Connecting the player to amplifiers or recorders for sound monitoring or recording.
Step-by-step process for inserting a CD and starting playback.
Connecting headphones and adjusting the listening volume.
Operations for pause, stop, search, and removing the disc.
Instructions for playing 3-inch (8 cm) CD formats.
Using the BASS BOOST switch for enhanced low-frequency sound.
Using the AVLS selector to limit maximum volume and prevent distortion.
How to change between various playback modes like INTRO, REPEAT, and SHUFFLE.
Standard playback of the entire disc without special modes.
Previewing the beginning of each track on the disc.
Playing a single selected track and stopping automatically.
Playing tracks in a random or shuffled sequence.
What the display shows during playback, pause, and initial operations.
Locating selections during shuffle play mode.
Programming a custom playback order of selected tracks.
Using the HOLD switch to prevent accidental button presses.
Solutions for common problems like disc not starting or skipping.
Troubleshooting no sound from headphones or speakers.
Resolving display errors and short battery life.
Instructions for cleaning the lens, headphone plug, and casing.
Guidelines for handling, cleaning, and protecting compact discs.
Detailed system, laser, error correction, and output specifications.
Information on power requirements, dimensions, and supplied accessories.
Identification and function of all buttons, switches, and ports.
Warnings about the laser beam and not disassembling the unit.
Guidelines for using batteries, AC adaptor, and car battery operation.
Advice on volume levels, lens care, and disc table handling.
Recommended and prohibited installation locations and conditions.
Safety tips for headphones, including road safety and hearing protection.