Sony TCM-21DV, TCM-22DV, TCM-20DV service manual Schematic Diagram See page 15 for IC Block Diagram

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TCM-20DV/21DV/22DV/23DV

6-3. SCHEMATIC DIAGRAM • See page 15 for IC Block Diagram.

Note on Schematic Diagram:

•All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

•All resistors are in Ω and 1/4 W or less unless otherwise specified.

•C: panel designation.

•U : B+ Line.

•H: adjustment for repair.

•Total current is measured with no cassette installed.

•Power voltage is dc 3 V and fed with regulated dc power supply from external power voltage jack.

•Voltages are dc with respect to ground under no-signal conditions.

no mark : PLAY

< > : RECORD

•Voltages are taken with a VOM (Input impedance 10 MΩ ). Voltage variations may be noted due to normal produc- tion tolerances.

•Signal path.

E : PLAY

a : RECORD

– 13 –

– 14 –

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Contents NEW SpecificationsSection Servicing Notes Table of ContentsMechanical Adjustments DiagramsLocation of Controls Section GeneralCabinet REAR, Cassette LID Section DisassemblyBelt Main BOARD, Mechanism Deck MT-20DV-118Installation Main Board Tape Tension Measurement Section Mechanical AdjustmentsTorque Measurement Test Tape Section Electrical AdjustmentsTape Speed Adjustment Record/Playback Head Azimuth AdjustmentSignal Path Play Record Section DiagramsBlock Diagram SW Board Printed Wiring BoardsSemiconductor Location Schematic Diagram See page 15 for IC Block Diagram Cabinet Section IC Block Diagram IC101 LA4168ML-TE-LSection Exploded Views Mechanism Deck MT-20DV-118 110 109 112 116 101 107 120 Section Electrical Parts List Main Main SW
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TCM-21DV, TCM-20DV, TCM-22DV specifications

The Sony TCM-20DV, TCM-21DV, and TCM-22DV are compact cassette tape recorders that exemplify the brand's commitment to quality audio capture and practical design. These models cater to a diverse audience, including students, journalists, and hobbyists, who need reliable recording devices for various purposes, from lectures and interviews to personal dictations.

The TCM-20DV, the entry-level model, offers straightforward functionality with user-friendly controls. It features a built-in microphone and a simple button layout, allowing users to start recording quickly and effortlessly. This model supports normal and high-speed playback, enabling fast review of recorded material. The TCM-20DV is powered by two AA batteries, making it an accessible and portable option for on-the-go recordings.

Moving up the line, the TCM-21DV introduces additional features that enhance the user experience. It retains the solid build quality and portability of its predecessor while adding a headphone jack for private listening and an external microphone input for improved audio quality. This model also includes an automatic shut-off feature, which conserves battery life by turning off the device when idle for a specific duration. The TCM-21DV is well-suited for more demanding recording tasks, thanks to these enhancements.

The TCM-22DV, the flagship model in this trio, takes the capabilities even further. It incorporates a dynamic microphone that captures clear and crisp audio, making it particularly effective in noisy environments. The TCM-22DV also offers advanced sound processing technologies that enhance playback fidelity, ensuring that recordings sound as close to the original source as possible. Furthermore, it features a built-in speaker that allows for convenient playback without the need for headphones.

All three models are built with durable materials, ensuring longevity and robustness for everyday use. Their design emphasizes ease of use, featuring intuitive controls and lightweight construction that make them comfortable to handle and transport.

In conclusion, the Sony TCM-20DV, TCM-21DV, and TCM-22DV serve distinct user needs while displaying the brand's dedication to quality audio recording. With lightweight, portable designs, various features, and enhancements, these tape recorders remain relevant in an age of digital technology, continuing to offer reliable and effective audio solutions.
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