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Teac A-7300 - Service Manual

Teac A-7300
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SERVIGEMANUAL
GENERAL
DESCRIPTION
TEAC'S
A-7300
and
A-7300
2T
are
high
quality
stereo
tape
decks,
representing
a
New
Generation
in
the
design
and
construction
of
recording
equipment.
With
AC
reel
motors
and
Direct-Drive
Servo-cont-
rolled
DC
Motor-Capstan,
all
controlled
by
Integrated
Cir-
cuit
(IC)
Logic
Circuitry,
these
decks
provide
highly
reliable
operation
at
greatly
reduced
noise
and
heat
levels.
With
almost
all
relays
replaced
by
Logic
Circuits,
transport
control
is
quick
and
positive
and
governed
by
6
calculator-
like
buttons
on
the
control
center.
Advanced
electronics
are
also
utilized.
This
manual
is:
the
final
version
and
supersedes
previous
provisional
manual.
PRODUCT
OF
JAPAN
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Summary

GENERAL DESCRIPTION

SPECIFICATIONS

MECHANICAL SPECIFICATIONS

Lists mechanical specifications like tracks, heads, reel size, motors, etc.

ELECTRICAL SPECIFICATIONS

Lists electrical specifications like frequency response, impedance, levels, etc.

TAPE TRANSPORT PARTS LOCATION

MEASUREMENT AND ADJUSTMENT

MECHANICAL ADJUSTMENTS

Covers mechanical adjustments and measurements for the deck.

ADJUSTMENT OF D.C. (on the STABILIZER UNIT)

Explains how to adjust DC voltage on the stabilizer unit.

CAPSTAN SHAFT TOLERANCE ADJUSTMENT

TAPE SPEED ADJUSTMENT

FLUTTER MEASUREMENT

PINCH ROLLER PRESSURE

TORQUE MEASUREMENT PROCEDURE

HEAD ALIGNMENT

HEIGHT ADJUSTMENT (4 TRACK)

Details the height adjustment for 4-track heads.

HEAD ASSEMBLY REMOVAL AND REPLACEMENT

ADJUSTMENT LOCATIONS OVERVIEW

ELECTRICAL ADJUSTMENTS

Playback Head Adjustment

Adjusts the playback head for optimal signal reproduction.

Specified Output Level Setting

Sets the output level to the specified O VU reference.

VU Meter Calibration

Calibrates the VU meter for accurate level readings.

Frequency Response Adjustment

Adjusts the frequency response of the unit.

Monitor Level Setting

Sets the monitor level for audio monitoring.

VU Meter Level Set

Sets the VU meter level for proper indication.

Record Head Azimuth Adjustment

Adjusts the record head azimuth for correct track alignment.

Bias Trap Adjustment

Adjusts the bias trap for optimal recording.

Record Level Set

Sets the record level for optimal recording input.

Overall Frequency Response Check

Checks and adjusts the overall frequency response.

Bias #1 Adjustment

Performs the Bias #1 adjustment.

Bias #2 Adjustment

Performs the Bias #2 adjustment.

Bias #3 Adjustment

Performs the Bias #3 adjustment.

FREQUENCY RESPONSE CHART 2 T,4 T

PLAYBACK PERFORMANCE (2 T,4 T)

Details playback performance frequency response limits.

FREQUENCY RESPONSE CHART 2 T

RECORD PERFORMANCE (2 T,4 T)

Details record performance frequency response limits.

FREQUENCY RESPONSE CHART 4 T

TROUBLESHOOTING

PARTS LISTING AND ORDERING

PARTS ORDERING INFORMATION

Provides information on how to order spare parts.

NOTICE REGARDING PARTS ORDERS

Gives important notices regarding ordering spare parts.

PARTS IDENTIFICATION CODING

Explains the coding system used for identifying parts.

EXPLODED VIEWS AND PARTS LIST

CENTER BASE SECTION (Exploded Front View)

Shows an exploded view of the center base section (front).

CENTER BASE SECTION (Exploded Rear View)

Shows an exploded view of the center base section (rear).

LOWER MAIN CHASSIS EXPLODED VIEW

AMPLIFIER SECTION EXPLODED VIEW

TRIM AND CABINET PARTS EXPLODED VIEW

PC BOARD DIAGRAMS

PLAY LINE AMP UNIT DIAGRAM

Diagram of the Play Line Amp Unit PC board.

AMP STABILIZER UNIT DIAGRAM

Diagram of the Amp Stabilizer Unit PC board.

BIAS OSC UNIT DIAGRAM

Diagram of the Bias Osc Unit PC board.

MIC MIXING AMP UNIT DIAGRAM

Diagram of the Mic Mixing Amp Unit PC board.

REC LINE AMP UNIT DIAGRAM

Diagram of the Rec Line Amp Unit PC board.

METER PHONE AMP UNIT DIAGRAM

Diagram of the Meter Phone Amp Unit PC board.

PLAY EQ AMP UNIT DIAGRAM

Diagram of the Play EQ Amp Unit PC board.

RECORD AMP UNIT DIAGRAM

Diagram of the Record Amp Unit PC board.

SOLENOID DRIVE UNIT DIAGRAM

Diagram of the Solenoid Drive Unit PC board.

REEL MOTOR DRIVE UNIT DIAGRAM

Diagram of the Reel Motor Drive Unit PC board.

CONTROL UNIT DIAGRAM

Diagram of the Control Unit PC board.

STABILIZER UNIT DIAGRAM

Diagram of the Stabilizer Unit PC board.

POWER SUPPLY UNIT DIAGRAM

Diagram of the Power Supply Unit PC board.

REWIND STOP UNIT DIAGRAM

Diagram of the Rewind Stop Unit PC board.

MIC. TRANSFORMER DIAGRAM

Diagram related to the Mic. Transformer.

PC BOARD PARTS LIST

PLAY LINE AMP UNIT PARTS LIST

Parts list for the Play Line Amp Unit.

AMP STABILIZER UNIT PARTS LIST

Parts list for the Amp Stabilizer Unit.

BIAS OSC UNIT PARTS LIST

Parts list for the Bias Osc Unit.

MIC MIXING AMP UNIT PARTS LIST

Parts list for the Mic Mixing Amp Unit.

REC LINE AMP UNIT PARTS LIST

Parts list for the Rec Line Amp Unit.

METER PHONE AMP UNIT PARTS LIST

Parts list for the Meter Phone Amp Unit.

PLAY EQ AMP UNIT PARTS LIST

Parts list for the Play EQ Amp Unit.

RECORD AMP UNIT PARTS LIST

Parts list for the Record Amp Unit.

SOLENOID DRIVE UNIT PARTS LIST

Parts list for the Solenoid Drive Unit.

REEL MOTOR DRIVE UNIT PARTS LIST

Parts list for the Reel Motor Drive Unit.

CONTROL UNIT PARTS LIST

Parts list for the Control Unit.

STABILIZER UNIT PARTS LIST

Parts list for the Stabilizer Unit.

POWER SUPPLY UNIT PARTS LIST

Parts list for the Power Supply Unit.

REWIND STOP UNIT PARTS LIST

Parts list for the Rewind Stop Unit.

MIC. TRANSFORMER PARTS LIST

Parts list for the Mic. Transformer.

ASSEMBLING HARDWARE CODING LIST

TIMING SEQUENCE CHART

Summary

GENERAL DESCRIPTION

SPECIFICATIONS

MECHANICAL SPECIFICATIONS

Lists mechanical specifications like tracks, heads, reel size, motors, etc.

ELECTRICAL SPECIFICATIONS

Lists electrical specifications like frequency response, impedance, levels, etc.

TAPE TRANSPORT PARTS LOCATION

MEASUREMENT AND ADJUSTMENT

MECHANICAL ADJUSTMENTS

Covers mechanical adjustments and measurements for the deck.

ADJUSTMENT OF D.C. (on the STABILIZER UNIT)

Explains how to adjust DC voltage on the stabilizer unit.

CAPSTAN SHAFT TOLERANCE ADJUSTMENT

TAPE SPEED ADJUSTMENT

FLUTTER MEASUREMENT

PINCH ROLLER PRESSURE

TORQUE MEASUREMENT PROCEDURE

HEAD ALIGNMENT

HEIGHT ADJUSTMENT (4 TRACK)

Details the height adjustment for 4-track heads.

HEAD ASSEMBLY REMOVAL AND REPLACEMENT

ADJUSTMENT LOCATIONS OVERVIEW

ELECTRICAL ADJUSTMENTS

Playback Head Adjustment

Adjusts the playback head for optimal signal reproduction.

Specified Output Level Setting

Sets the output level to the specified O VU reference.

VU Meter Calibration

Calibrates the VU meter for accurate level readings.

Frequency Response Adjustment

Adjusts the frequency response of the unit.

Monitor Level Setting

Sets the monitor level for audio monitoring.

VU Meter Level Set

Sets the VU meter level for proper indication.

Record Head Azimuth Adjustment

Adjusts the record head azimuth for correct track alignment.

Bias Trap Adjustment

Adjusts the bias trap for optimal recording.

Record Level Set

Sets the record level for optimal recording input.

Overall Frequency Response Check

Checks and adjusts the overall frequency response.

Bias #1 Adjustment

Performs the Bias #1 adjustment.

Bias #2 Adjustment

Performs the Bias #2 adjustment.

Bias #3 Adjustment

Performs the Bias #3 adjustment.

FREQUENCY RESPONSE CHART 2 T,4 T

PLAYBACK PERFORMANCE (2 T,4 T)

Details playback performance frequency response limits.

FREQUENCY RESPONSE CHART 2 T

RECORD PERFORMANCE (2 T,4 T)

Details record performance frequency response limits.

FREQUENCY RESPONSE CHART 4 T

TROUBLESHOOTING

PARTS LISTING AND ORDERING

PARTS ORDERING INFORMATION

Provides information on how to order spare parts.

NOTICE REGARDING PARTS ORDERS

Gives important notices regarding ordering spare parts.

PARTS IDENTIFICATION CODING

Explains the coding system used for identifying parts.

EXPLODED VIEWS AND PARTS LIST

CENTER BASE SECTION (Exploded Front View)

Shows an exploded view of the center base section (front).

CENTER BASE SECTION (Exploded Rear View)

Shows an exploded view of the center base section (rear).

LOWER MAIN CHASSIS EXPLODED VIEW

AMPLIFIER SECTION EXPLODED VIEW

TRIM AND CABINET PARTS EXPLODED VIEW

PC BOARD DIAGRAMS

PLAY LINE AMP UNIT DIAGRAM

Diagram of the Play Line Amp Unit PC board.

AMP STABILIZER UNIT DIAGRAM

Diagram of the Amp Stabilizer Unit PC board.

BIAS OSC UNIT DIAGRAM

Diagram of the Bias Osc Unit PC board.

MIC MIXING AMP UNIT DIAGRAM

Diagram of the Mic Mixing Amp Unit PC board.

REC LINE AMP UNIT DIAGRAM

Diagram of the Rec Line Amp Unit PC board.

METER PHONE AMP UNIT DIAGRAM

Diagram of the Meter Phone Amp Unit PC board.

PLAY EQ AMP UNIT DIAGRAM

Diagram of the Play EQ Amp Unit PC board.

RECORD AMP UNIT DIAGRAM

Diagram of the Record Amp Unit PC board.

SOLENOID DRIVE UNIT DIAGRAM

Diagram of the Solenoid Drive Unit PC board.

REEL MOTOR DRIVE UNIT DIAGRAM

Diagram of the Reel Motor Drive Unit PC board.

CONTROL UNIT DIAGRAM

Diagram of the Control Unit PC board.

STABILIZER UNIT DIAGRAM

Diagram of the Stabilizer Unit PC board.

POWER SUPPLY UNIT DIAGRAM

Diagram of the Power Supply Unit PC board.

REWIND STOP UNIT DIAGRAM

Diagram of the Rewind Stop Unit PC board.

MIC. TRANSFORMER DIAGRAM

Diagram related to the Mic. Transformer.

PC BOARD PARTS LIST

PLAY LINE AMP UNIT PARTS LIST

Parts list for the Play Line Amp Unit.

AMP STABILIZER UNIT PARTS LIST

Parts list for the Amp Stabilizer Unit.

BIAS OSC UNIT PARTS LIST

Parts list for the Bias Osc Unit.

MIC MIXING AMP UNIT PARTS LIST

Parts list for the Mic Mixing Amp Unit.

REC LINE AMP UNIT PARTS LIST

Parts list for the Rec Line Amp Unit.

METER PHONE AMP UNIT PARTS LIST

Parts list for the Meter Phone Amp Unit.

PLAY EQ AMP UNIT PARTS LIST

Parts list for the Play EQ Amp Unit.

RECORD AMP UNIT PARTS LIST

Parts list for the Record Amp Unit.

SOLENOID DRIVE UNIT PARTS LIST

Parts list for the Solenoid Drive Unit.

REEL MOTOR DRIVE UNIT PARTS LIST

Parts list for the Reel Motor Drive Unit.

CONTROL UNIT PARTS LIST

Parts list for the Control Unit.

STABILIZER UNIT PARTS LIST

Parts list for the Stabilizer Unit.

POWER SUPPLY UNIT PARTS LIST

Parts list for the Power Supply Unit.

REWIND STOP UNIT PARTS LIST

Parts list for the Rewind Stop Unit.

MIC. TRANSFORMER PARTS LIST

Parts list for the Mic. Transformer.

ASSEMBLING HARDWARE CODING LIST

TIMING SEQUENCE CHART

Teac A-7300 Specifications

General IconGeneral
BrandTeac
ModelA-7300
CategoryTape Deck
LanguageEnglish

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