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Sony TC-KB920S Service Manual

Sony TC-KB920S
38 pages
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MICROFILM
SERVICE MANUAL
STEREO CASSETTE DECK
AEP Model
E Model
Australian Model
Model Name Using Similar Mechanism TC-KE500S
Tape Transport Mechanism Type TCM-190VB14
SPECIFICATIONS
TC-KB920S
Dolby noise reduction and HX Pro headroom ex-
tension manufactured under license from Dolby
Laboratories Licensing Corporation. HX Pro origi-
nated by Bang & Olufsen.
“DOLBY”, the double-D symbol a, and “HX PRO”
are trademarks of Dolby Laboratories Licensing Cor-
poration.
– Continued on next page –

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Sony TC-KB920S Specifications

General IconGeneral
Track System4-track, 2-channel stereo
Heads3 (Record, Playback, Erase)
MotorDC Servo Motor
Noise ReductionDolby B, C
OutputsLine Out, Headphone Out
Tape Speed4.76 cm/s
Tape TypeType I, II, IV
Frequency Response20Hz to 20kHz (Metal tape)
Wow and Flutter0.07% (WRMS)
OutputLine Out
InputsLine In, Mic In
Dimensions430 x 310mm

Summary

SPECIFICATIONS

Performance Specifications

Details harmonic distortion, frequency response, and S/N ratios.

Operational Specifications

Lists winding times, head types, motors, and input specs.

General Specifications

Power, Dimensions, and Accessories

Covers power requirements, physical size, and included items.

Model Identification

Back Panel Model Codes

Identifies model codes associated with different market regions.

Repair Notes

Circuit Board Repair Guidance

Offers guidance on soldering and chip component replacement.

SECTION 1 GENERAL

Location of Controls

Identifies and explains the function of each control on the front panel.

SECTION 2 DISASSEMBLY

Case and Front Panel Disassembly

Details steps for removing the outer case and front panel assembly.

MD Assy Section Disassembly

Outlines the procedure for removing the MD assembly.

Internal Component Disassembly

Main Board and Cassette Holder Removal

Describes detaching the main board and cassette holder assembly.

Mechanism Component Disassembly

Base Block and Head Assembly

Instructions for fitting base block and head components.

Audio and Motor Assembly

Audio Board and Motor Connections

Shows the audio board, capstan motor, and reel motor connections.

SECTION 3 MECHANICAL ADJUSTMENTS

Adjustment Precautions and Torque

Lists precautions and torque specifications for adjustments.

Head Height and Declination Adjustment

Guides on adjusting record/playback head height and declination.

SECTION 4 ELECTRICAL ADJUSTMENTS

Head Azimuth Adjustment

Procedure for setting the head azimuth for optimal playback.

Standard Levels and Test Tapes

Defines standard signal levels and test tape usage.

Tape Speed and Bias Adjustments

Tape Speed, Playback Level, and Bias Adjustments

Instructions for adjusting tape speed, playback level, and bias.

Record Level and EQ Adjustments

Record Level and EQ (IV) Adjustment

Procedures for setting recording input level and equalization.

SECTION 5 DIAGRAMS

Notes for Diagrams

Explains conventions for schematic and wiring diagrams.

Printed Wiring Boards - MD Section

MD Section Board Layouts

Shows component layouts for Audio and Leaf SW boards.

Schematic Diagram - MD Section

MD Section Schematics

Circuit diagrams for Audio and Leaf SW boards.

Waveforms and IC Block Diagrams

Main Board Waveforms and IC Diagrams

Illustrates waveforms and functional diagrams for main board ICs.

Printed Wiring Board - MAIN Section

Main Board Component Layout

Diagram showing the placement of components on the main board.

Schematic Diagram - MAIN Section (1/2)

Main Board Circuitry (Part 1)

Part 1 of the schematic diagram for the main board.

DOLBY-S Board Diagrams

Dolby-S Board Layout and Schematic

Layout and circuit diagram for the Dolby-S section.

POWER Section Diagrams

Power Board Layouts and Schematic

Layouts for power boards and the power section circuit diagram.

PANEL Section Diagrams

Panel Board Layouts

Layouts for Panel, Rec Vol, and HP boards.

Schematic Diagram - PANEL Section

Panel and Control Schematics

Circuit diagrams for panel controls, Rec Vol, HP, and Balance.

IC Pin Function Descriptions

Main Board IC Pinouts

Detailed pin function descriptions for the main board IC.

SECTION 6 EXPLODED VIEWS

Case, Chassis, and Front Panel Views

Exploded views of the main chassis, case, and front panel assemblies.

Front Panel and MD Assembly Exploded Views

Detailed Front Panel Component Views

Exploded view of individual front panel controls and parts.

MD Assembly Component Views

Exploded view of the MD mechanism assembly parts.

MD Assembly Exploded View

MD Assy Section Parts

Detailed exploded view of the MD assembly components.

Mechanism Deck Section-1 Exploded View

Mechanism Deck Components (Section 1)

Exploded view of the first part of the mechanism deck.

Mechanism Deck Section-2 Exploded View

Mechanism Deck Components (Section 2)

Exploded view of the second part of the mechanism deck.

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