This is the instruction manual of a Sony WM-EX631 cassette player
This manual explains how to prepare the Sony WM-EX631 Walkman, install either a dry AA battery or the supplied rechargeable NH-10WM battery, and operate the cassette player using the main unit or remote control. It covers playback functions such as play, stop, fast‑forward, rewind, repeat, and speed control, as well as sound‑enhancement modes and the automatic volume limiter (AVLS).
Safety and maintenance sections give detailed precautions for charging, battery handling, heat exposure, and cleaning of the unit, headphones, and battery contacts. The specifications page lists the device’s audio performance, power requirements, dimensions, and battery life.
| Frequency response | 30 – 18 000 Hz |
|---|---|
| Load impedance (headphones) | 8 – 300 Ω |
| Power requirement | 1.5 V |
| Battery type (dry) | One R6 (size AA) battery |
| Battery type (rechargeable) | NH‑10WM, 1.2 V 900 mAh NiMH |
| Dimensions (W × H × D) | 77.1 × 108.1 × 20.4 mm |
| Mass | Approx. 142 g |
| Rechargeable battery life (playback) | ≈ 22 hours |
| Full charge time (rechargeable) | ≈ 6 hours |
A fully charged NH‑10WM rechargeable battery provides about 22 hours of playback time.
The unit can use either one AA (R6) dry battery or the supplied rechargeable NH‑10WM NiMH battery.
Full charging of the rechargeable battery takes about 6 hours.
Slide the HOLD switch in the direction of the arrow to lock the controls of the Walkman and remote control.