Sony TCM-20DV, TCM-22DV, TCM-21DV service manual Specifications, New

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SERVICE MANUAL

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

US Model

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

Ver 1.0 2000. 02

Canadian Model

TCM-20DV/22DV

AEP Model

TCM-20DV/21DV

E Model

TCM-20DV/23DV

Chinese Model

TCM-20DV

Photo: TCM-20DV

Model Name Using Similar Mechanism

NEW

 

 

Tape Transport Mechanism Type

MT-20DV-118

 

 

Recording system

2-track 1 channel monaural

Tape speed

4.8cm/s or 2.4 cm/s

Frequency range

250 - 6,300 Hz using nomal (TYPE

I)cassette (with REC TIME switch at “NORMAL”)

Speaker

Approx. 3.6 cm (1 7/16 in.) dia.

Power output

250 mW (at 10 % harmonic distortion)

Input

Microphone input jack (minijack) sensitivity 0.2 mV for 3 kilohms or lower impedance microphone

Output

Earphone jack (minijack) for 8 - 300 ohms earphone

Variable range of the tape speed From approx. +30% to –15% (with REC TIME switch at “NORMAL”)

Power requirements

3 V DC batteries R6 (AA) ⋅ 2/ External DC 3 V power sources

Dimensions (w/h/d) (incl. projecting parts and controls)

Approx. 112 ⋅ 36.6 ⋅ 90.3 mm (4 12 ⋅ 1 12 x 3 58 in.)

SPECIFICATIONS

Supplied accessories

The instructions in this manual are for 4 models.

The TCM-20DV is the model used for illustration purposes.

TCM-

23DV 22DV 21DV 20DV

AC power adaptor (1)

a

Battery charger adaptor (1)

a

Rechargeable batteries (2)

 

 

 

 

(NC-AA, 1.2V, 700mAh,

a

Ni-Cd)

 

 

 

 

Cassette tape C-90 (1)

a

Battery LR6 (2)

a

Monaural microphone (1)

a

Super-directional

 

microphone (1)

a

Carrying pouch (1)

a

Hand strap (1)

a

a

a

a

(attached to the unit)

 

 

 

 

Battery life (Approx. hours) (EIAJ*)

 

Playback

Recording

Sony alkaline

11

11

LR6 (SG)

 

 

Sony R6P (SR)

3

3

Sony

 

 

rechargeable

 

 

battery

3

3

(NC-AA) fully

 

 

charged (TCM- 22DV only)

House Current (see Fig. A-)

Connect the AC power adaptor to DC IN 3V and to a wall outlet. The AC power adaptor is supplied only with the TCM-22DV. For other models, use the AC-E30HG AC power adaptor (not supplied). Do not use any other AC power adaptor.

Polarity of the plug

Note

Specifications for AC-E30HG vary for each area. Check your local voltage and the shape of the plug before purchasing.

Design and specifications are subject to change without notice.

Mass

Approx. 175 g (6.2 oz.)

*Measured value by the standard of EIAJ (Electronic Industries Association of Japan). (Using a Sony HF series cassette tape and playing back with speakers)

Note

The battery life may shorten depending on the operation of the unit.

For maximum performance we recommend that you use alkaline batteries.

CASSETTE-CORDER

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Contents NEW SpecificationsMechanical Adjustments Table of ContentsDiagrams Section Servicing NotesLocation of Controls Section GeneralCabinet REAR, Cassette LID Section DisassemblyBelt Main BOARD, Mechanism Deck MT-20DV-118Installation Main Board Torque Measurement Section Mechanical AdjustmentsTape Tension Measurement Tape Speed Adjustment Section Electrical AdjustmentsRecord/Playback Head Azimuth Adjustment Test TapeBlock Diagram Section DiagramsSignal Path Play Record Semiconductor Location Printed Wiring BoardsSW Board Schematic Diagram See page 15 for IC Block Diagram Section Exploded Views IC Block Diagram IC101 LA4168ML-TE-LCabinet Section 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.