Sony TCM-21DV Section Servicing Notes, Table of Contents, Mechanical Adjustments, Diagrams

Page 2

 

TABLE OF CONTENTS

 

1.

SERVICING NOTES

2

2.

GENERAL

3

3.

DISASSEMBLY

4

4.

MECHANICAL ADJUSTMENTS

7

5.

ELECTRICAL ADJUSTMENTS

8

6.DIAGRAMS

6-1.

Block Diagram

9

6-2.

Printed Wiring Board

11

6-3.

Schematic Diagram

13

7.

EXPLODED VIEWS

16

8.

ELECTRICAL PARTS LIST

19

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS

AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0

SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SECTION 1

SERVICING NOTES

In this set, the S102 (POWER) detects REC/PLAYBACK on.

It is mounted on the MAIN board, and therefore the REC/PLAY- BACK on cannot be detected with the MAIN board removed. When making an operation check and voltage check of mechani- cal deck with the MAIN board removed, fix the S102 at turn on.

– MAIN BOARD (Conductor Side) –

S102

on

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270 ˚C dur- ing repairing.

•Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

•Be careful not to apply force on the conductor when soldering or unsoldering.

Notes on chip component replacement

•Never reuse a disconnected chip component.

•Notice that the minus side of a tantalum capacitor may be dam- aged by heat.

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Contents Specifications NEWDiagrams Table of ContentsMechanical Adjustments Section Servicing NotesSection General Location of ControlsSection Disassembly Cabinet REAR, Cassette LIDMain BOARD, Mechanism Deck MT-20DV-118 BeltInstallation Main Board Tape Tension Measurement Section Mechanical AdjustmentsTorque Measurement Record/Playback Head Azimuth Adjustment Section Electrical AdjustmentsTape Speed Adjustment Test TapeSignal 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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