Yamaha K-1020 Service Manual

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STEREO
CASSETTE
DECK
K-l
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I
FRONT PANEL
;
a
IJITPORTANT NOTICE
This manual has becn
providcd
for
the
use
of authorized
Yamaha
Retailers and their service
personnel.
It has
been assumed that basic servicc
proccdures
inhcrant to the industry, and more
specifically
Yamaha
Products, are alrcady known
and
understood
by the
users,
and
have
thereforc
not
been rcstatcd.
WARNING: Failure to
follow
appropriate service and safety
procedures
whcn
servicing this
product
may result in
personal
iniury, dcstruction of expcnsivc components
and
failure
of the
product
to
perform
as specificd.
For
thesc reasons, we advisc all
Yamaha
product
owners
that all servicc required should be
performed
by an authorizcd Yamaha Retailer or
the
dppointed
rer vice
reprerentativc.
IMPORTANT:
The
prescntation
or
salc
of this manual to any individual
or
firm
does not constitute
authorization, ccrtification,
recognition
of any applicable
technical capabilitites, or
establish a
principle
agent relationship of any form.
Thc data
provided
is belicved to
be accurate and applicable to the
unit/s
indicatcd on the covcr.
The
rcscarch, engineering, and
scrvice
departments
of
Yamaha
are continually striving
to
improve Yamaha
products.
Modifications
are, therefore,
inevitable
and changes in specification are
subject to change without
notice
or obliSation to retrofit. Should any discrepancy appcar to exist,
please
contact the distributor's
Servicc
Division.
Static dischargcs can destroy experrsive components. Discharge
any static electricity
your
body may have
accumulated by
grounding
yourself
to the
ground
buss in the unit
(heavy
gauge
black
wires
connect to this buss).
Turn the
unit
OFF during disassembly and
parts
replacement. Recheck
all
work
before
you
apply
power
to th€ unit.
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CONTENTS
TOSERVICEPERSONEL
........1
REARPANELS... .....1
BLOCKDIAGRAM ......2
SPEC|F|CAT|ONS.
......3
INTERNALVIEW. ......3
DISASSEMBLYPROCEDURES . .....
4-6
MECHANICALADJUSTMENTS. 7
-9
ELECTRICALADJUSTMENTS . ....9-11
LSI DATA
TABLES
12
TIMINGCHART .......13
PRINTED
CIRCUIT
BOARD
(Pattern
Side)
.
.
14
-
17
wtRtNG .. .. .. . 18
fcBLocK
..19-21
SCHEMATICDIAGRAM
.....22,23
PARTSLTST.
.24-36
SINCEI'87
@YAMAHA
NIPPON GAKKI CO., LTD. HAMAMATSU,
JAPAN
2.5k 533
El
@
Printed in Japan.
'85 . I
_ ..1

Yamaha K-1020 Specifications

General

Brand	Yamaha
Model	K-1020
Category	Cassette Player
Language	English

Summary

To Service Personnel

Critical Components Information

Component replacement guidelines for specialized parts and adherence to original specifications.

Leakage Current Measurement

Procedure for verifying insulation and measuring leakage current after service completion.

Rear Panels

Model-Specific Rear Panel Views

Visual guides for rear panel connections and ports across different regional models.

Block Diagram

Signal Flow Overview

Diagram illustrating the audio signal path and interconnections between system components.

Specifications

Technical Performance Data

Detailed technical specifications of the cassette deck's performance characteristics.

Internal Component Identification

Labeled diagram identifying major internal parts and their reference numbers.

Disassembly Procedures

Mechanism Unit and Head Replacement

Step-by-step guide for disassembling the mechanism and replacing heads.

Connector Wiring Diagrams

Pinout and wiring details for various internal connectors across different models.

Mechanical Adjustments

Preparation and Required Tools

Essential pre-adjustment steps including head cleaning and list of necessary tools.

Adjustment Steps and Ratings

Detailed procedures and target values for performing mechanical calibrations.

Electrical Adjustments

Playback Calibration Procedures

Steps for adjusting playback level, EQ, and frequency response.

Recording Calibration Procedures

Steps for setting recording levels, bias, and frequency response.

Printed Circuit Board Layouts

Main and Operation Circuit Boards

Layouts for the main and operation circuit boards showing component placement.

Power and Dolby Circuit Boards

Layouts for the power supply and Dolby circuit boards.

Wiring Diagrams

Overall Unit Wiring

Comprehensive diagram showing interconnections between major units and boards.

IC Block Descriptions

IC Pin Assignments and Functions

Details on integrated circuit pinouts, functions, and equivalent part numbers.

Schematic Diagrams

Amplifier and Signal Path Schematics

Detailed circuit diagrams for audio amplification and signal processing stages.

Noise Reduction and Control Circuit Schematics

Circuit diagrams for Dolby, dbx, and control logic functions.

Exploded Views

General Exploded View

Overall assembly diagram showing major external parts and their numbering.

Mecha Unit Exploded View

Detailed assembly diagram of the tape transport mechanism and its components.

Parts List

Electrical Components Listing

Comprehensive list of electrical parts with part numbers and descriptions.

Mechanism Parts List

Detailed list of mechanical parts for the tape transport mechanism.