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Details continuous playback hours for different battery types.
Guidelines for soldering and handling circuit boards during repair.
Precautions for reusing or handling chip components.
Procedure for replacing FG901, including testing and replacement strategy.
General precautions before performing adjustments.
Procedures for mechanical adjustments like torque and tension.
Adjusting rotor thrust play and wow/flutter parameters.
Specific settings and procedure for wow and flutter adjustment.
Procedures for electrical adjustments like tape speed and azimuth.
Steps and settings for adjusting the tape speed.
Procedure to adjust the playback head for maximum output levels.
Procedure to check the phase relationship between channels.
Block diagrams illustrating the internal structure of key ICs.
Exploded view and parts list for the unit's cabinet.
Exploded view of the tape transport mechanism components.
Further exploded view of tape transport mechanism parts.
List of capacitors with their part numbers and specifications.
List of resistors with their part numbers and specifications.
List of coils with their part numbers and specifications.
List of semiconductors with their part numbers and specifications.
The Sony WM-DD11 is a high-quality cassette player designed for portable audio enjoyment, offering a blend of advanced features for superior sound reproduction and user convenience. As a "Walkman DD" model, it emphasizes direct drive technology for stable tape speed and minimal wow and flutter, crucial for high-fidelity playback.
The primary function of the WM-DD11 is to provide exceptional playback of audio cassettes. It incorporates Dolby noise reduction, a key feature that significantly reduces tape hiss, resulting in a cleaner and more dynamic audio experience. This makes it suitable for listening to a wide range of music genres with improved clarity. The device is equipped with a stereo minijack for headphones, allowing for private listening.
The WM-DD11 is designed for ease of use and portability. It operates on two R6 (size AA) batteries, providing a good balance between power and compact size, making it ideal for on-the-go listening. For extended use or stationary listening, it offers flexibility with external power options, including an EBP-500B battery case for two R20 (size D) batteries, an AC-D2M AC power adaptor for household use (220 V AC, 50 Hz), and a DCC-70 car battery cord for in-car entertainment (12V car battery). This versatility ensures that the device can be powered in various environments.
The unit features intuitive controls for basic cassette player functions such as play, fast forward (FF), and rewind (REW). A "TAPE SELECT" switch allows users to optimize playback for different tape types (NORM, CrO2, METAL), ensuring the best possible sound quality regardless of the cassette used. The "DOLBY NR" switch enables or disables the Dolby noise reduction feature, giving users control over their listening preference. A mechanical volume control allows for easy adjustment of the audio output.
For enhanced listening, the WM-DD11 comes with stereo headphones and a carrying case, emphasizing its portable nature and readiness for immediate use. The design includes projecting parts and controls that are integrated for user comfort and accessibility.
Maintaining the WM-DD11 involves several key practices to ensure its longevity and optimal performance. Regular cleaning of the playback head, pinch roller, capstan, and rubber belt with a denatured-alcohol-moistened swab is recommended to prevent audio degradation and tape damage. Demagnetizing the playback head with a head demagnetizer is also crucial to avoid magnetizing the tape, which can lead to sound distortion.
When performing adjustments or repairs, specific guidelines are provided to protect the device's delicate components. For instance, soldering on flexible circuit boards requires careful temperature control (around 270°C) and avoiding repeated contact with the same conductor. Chip component replacement emphasizes using new components and caution with heat-sensitive parts like tantalum capacitors.
Battery care is also highlighted as an important maintenance aspect. Users are advised to remove batteries when the unit will not be used for a long time to prevent leakage and corrosion, which can damage the device. The "BATTERY" indicator provides a visual cue when batteries are running low, prompting timely replacement.
The manual also details mechanical adjustments such as torque measurement for FWD, back tension, and FF/REW modes, ensuring that the tape transport mechanism operates within specified parameters. Tape tension measurement is also outlined. Electrical adjustments, including tape speed adjustment and playback head azimuth adjustment, are critical for maintaining accurate and high-quality audio playback. These adjustments involve using specific test tapes and measurement tools like a frequency counter, VTVM, and oscilloscope to calibrate the device precisely. The adjustment locations for these settings are clearly indicated, such as the RV601 on the main board for tape speed and the adjustment screw in the cassette chamber for head azimuth.
Overall, the Sony WM-DD11 is presented as a robust and high-performance portable cassette player, designed for discerning audio enthusiasts who value sound quality and reliability in a compact form factor. Its comprehensive features and detailed maintenance guidelines underscore its commitment to a premium user experience.
General| Type | Cassette Player |
|---|---|
| Brand | Sony |
| Model | WM-DD11 |
| Power Supply | 2 x AA batteries |
| Features | Dolby B Noise Reduction |
| Power Consumption | 0.5 W |
| Wow and Flutter | 0.1% |
| Playback Speed | 4.76 cm/s |
| Frequency Response | 40 - 15, 000 Hz |
