Sony TCM-20DV User Manual

SERVICE MANUAL
CASSETTE-CORDER
US Model
TCM-20DV/21DV/22DV/23DV
Canadian Model
TCM-20DV/22DV
AEP Model
TCM-20DV/21DV
E Model
TCM-20DV/23DV
Chinese Model
TCM-20DV
SPECIFICATIONS
TCM-20DV/21DV/
22DV/23DV
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MT-20DV-118
Photo: TCM-20DV
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)
— a ——
(NC-AA, 1.2V, 700mAh,
Ni-Cd)
Cassette tape C-90 (1)
——a —
Battery LR6 (2) ——a —
Monaural microphone (1) ——a —
Super-directional
a ———
microphone (1)
Carrying pouch (1) ——a —
Hand strap (1)
aaaa
(attached to the unit)
Battery life (Approx. hours) (EIAJ*)
Playback Recording
Sony alkaline
LR6 (SG)
11 11
Sony R6P (SR) 3 3
Sony
rechargeable
battery
33
(NC-AA) fully
charged (TCM-
22DV only)
* 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.
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.
Recording system
2-track 1 channel monaural
Tape speed
4.8 cm/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
1
⁄
2
× 1
1
⁄
2
x 3
5
⁄
8
in.)
Mass
Approx. 175 g (6.2 oz.)
Design and specifications are subject
to change without notice.
Ver 1.0 2000. 02
All manuals and user guides at all-guides.com
all-guides.com

Sony TCM-20DV Specifications

General

Brand	Sony
Model	TCM-20DV
Type	Cassette Player
Frequency Response	100 - 10, 000 Hz
Speaker	Built-in
Power Supply	2 x AA batteries or DC 3V
Features	Built-in microphone

Summary

SECTION 1 SERVICING NOTES

Safety Component Warnings

Critical safety components require specific Sony replacement parts for safe operation.

Flexible Circuit Board Repair

Guidelines for repairing flexible circuit boards, including soldering temperature and handling precautions.

Chip Component Replacement

Precautions for replacing chip components, with special attention to tantalum capacitors and heat damage.

SECTION 2 GENERAL

Location of Controls and Indicators

Identifies and illustrates the various controls, buttons, and indicators on the device.

SECTION 3 DISASSEMBLY

Cabinet and Cassette Lid Disassembly

Step-by-step procedure for disassembling the rear cabinet and cassette lid, including screw and claw removal.

SECTION 4 MECHANICAL ADJUSTMENTS

Torque Measurement Procedures

Specifies torque values for FWD, FWD Back Tension, FF, and REW operations using torque meters.

Tape Tension Measurement

Details tape tension measurement procedures and required equipment for FWD operations.

SECTION 5 ELECTRICAL ADJUSTMENTS

Tape Speed Adjustment

Procedures for adjusting playback tape speed for normal (4.8 cm/s) and double (2.4 cm/s) speeds.

Head Azimuth Adjustment

Method for adjusting the record/playback head azimuth to achieve maximum level meter reading.

SECTION 6 DIAGRAMS

Block Diagram

High-level overview of the device's functional blocks, including signal paths for playback and recording.

Printed Wiring Boards Layout

Illustrates the component and conductor layouts of the main board (component and conductor sides) and switch board.

Schematic Diagram

Detailed electronic circuit diagram showing component connections, voltage levels, and signal paths.

SECTION 7 EXPLODED VIEWS

Cabinet Section Exploded View

Detailed breakdown of the cabinet and its associated parts, including screws, springs, and plates.

Mechanism Deck Section-1 Exploded View

Detailed breakdown of the mechanism deck, section 1, showing levers, buttons, gears, and heads.

Mechanism Deck Section-2 Exploded View

Detailed breakdown of the mechanism deck, section 2, showing various levers, springs, and chassis components.

SECTION 8 ELECTRICAL PARTS LIST

Capacitors, Connectors, Diodes, ICs, Jacks

Lists part numbers, descriptions, and specifications for capacitors, connectors, diodes, ICs, and jacks.

Transistors and Resistors

Lists part numbers, descriptions, and specifications for transistors and various types of resistors.

Thermistors, Switches, Miscellaneous

Lists part numbers and descriptions for thermistors, switches, miscellaneous items, and accessories.