Sony TCM-121 User Manual

Power Requirements:
a SPECIFICATIONS
6 V dc, four batteries size “AA” (IEC
designation R6) or optional Sony Re-
chargeable Battery Pack BP-23
120
V
ac,
60
Hz
with
optional
Sony
AC:
Power
Adaptor
AC-9W
(US
model)
110
or
220
V
ac,
50
Hz
with
optional
AC
Power
Adaptor
AC-456C
available
in
Euro-
pean
countries
(AEP
model)
240 V ac, 50 Hz with optional AC Power
Adaptor AC-15A available in the United
Kingdom (UK model)
120 V ac, 60 Hz with supplied AC Power
Adaptor AC-9 {Canadian model)
110, 120,
220
or
240
V
ac,
50/60
Hz
with
optional
AC
Power
Adaptor
AC-4A
avail-
able
in
other
countries
(E
model)
12 V car battery with optional Sony Car
Battery Cord DCC-127A
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Canadian Mode:
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E. Mods
UK Model
Power
Consumption:
6
W
(60 Hz)
with
Sony
AC
Power
Adaptor
AC-
OW
9
VA
with
Sony
AC
Power
Adaptor
AC-456C
6
W
(60
Hz)
with
Sony
AC
Power
Adaptor
AC-9
-
9
W
with
Sony
AC
Power
Adaptor
AC-15A
~ 9,2 W (50 Hz) or 8.9 W (60 Hz)
with Sony AC Power Adaptor AC-4A
Recording System: 2-track 1-channel monaural
Frequency Response: ; 90 — 9,000 Hz
Fast
Winding
Time:
(Approx.
2
min.
with
Sony
Cassette
C-60
icati Test Equipment
22.5—60 g-cm Sony torque meter
Fast Forward] more than 60g.cm | Sony torque meter
Torque (0.83 oz - inch) CQ-201A
Rewind more than 60 g-cm | Sony torque meter
Torque (0.83 oz - inch) CQ-201A
more than 100 g Sony tape tension
(3.53 oz) meter CQ-403
230—370 g Spring scale or
(8.11—13.05 oz) | tension gauge
— Continued on page 2 —
SERVICE MANUAL

Sony TCM-121 Specifications

General

Brand	Sony
Model	TCM-121
Category	Cassette Player
Language	English

Summary

Specifications Overview

Power Requirements and Consumption

Details DC/AC power sources, consumption figures for various adaptors, and country-specific models.

Performance and Mechanical Specifications

Covers frequency response, winding time, torque, tape tension, and pinch roller pressure.

Circuit Description and Operation

Motor Servo Amp Circuit

Explains the principle and operation of the motor servo amp circuit for speed control.

System Diagrams

Block Diagram

Illustrates the functional blocks and signal flow of the cassette recorder.

Disassembly Procedures

Chassis, Case & Boards

Steps for removing bottom case, chassis, audio amp board, and reel spindle.

Front & Internal Mechanism Parts

Instructions for removing control panel, head board, levers, and lock plate.

Reel Spindle and Associated Parts

Procedure for removing the take-up reel spindle and related components.

Mechanical Adjustments

Torque & Tape Tension Measurement

Procedures for measuring torque and tape tension using specific test equipment.

Head Height Adjustment

Steps for adjusting the record/playback head height for optimal tape contact.

Electrical Adjustments

Playback Adjustments (Pinch Roller, Head Azimuth)

Procedures for adjusting pinch roller pressure and head azimuth during playback.

Performance Tuning (Tape Speed, Pre-end Light)

Steps for adjusting tape speed and pre-end light timing for performance tuning.

Diagrams and Schematics

Mounting Diagrams & Circuit Layouts

Shows mounting for semiconductors and circuit layouts for audio/servo amps.

Detailed Schematic Diagrams

Provides comprehensive schematic diagrams for the audio and servo motor sections.

Exploded Views and Parts Identification

Exploded View - Main Unit

Exploded diagram of the main unit, showing parts like microphone, holder, and case.

Exploded View - Mechanism Components

Exploded view of mechanism parts like flywheels, levers, and switches.

Exploded View - Head Assembly and Motor

Exploded view of head assembly, motor, and related components.

Electrical Parts List

Semiconductors, ICs, Diodes, Capacitors

List of semiconductor devices, integrated circuits, diodes, and capacitors with part numbers.

Resistors and Switches

List of resistors and switches with part numbers and specifications.

Miscellaneous Components and Accessories

Lists miscellaneous parts like heads, motors, microphones, speakers, and accessories.

Hardware and Component Reference

Carbon Resistor Values

Table listing 1/4 Watt carbon resistor values and their part numbers.

Hardware Nomenclature

Glossary of screws, nuts, washers, and retaining rings used in the unit.