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Akai GX-747 Service Manual

Akai GX-747
62 pages
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Table of Contents

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Akai GX-747 Specifications

General IconGeneral
Track System4-track, 2-channel stereo
Signal to Noise Ratio65dB
TypeReel-to-Reel
Motor2 x reel drive, 1 x capstan
Input Sensitivity70mV
Dimensions440 x 474 x 272mm
Reel Size10.5 inch reel
InputsRCA
OutputsXLR, RCA
Wow and Flutter0.03% (19 cm/s)

Summary

I. SPECIFICATIONS

II. DISMANTLING OF UNIT

III. CONTROLS

IV. PRINCIPAL PARTS LOCATION

V. VOLTAGE AND CYCLE CONVERSION

VI. DESCRIPTION OF CIRCUIT OPERATION

DETAILS AND FEATURES OF EE TAPE

Describes the properties and performance characteristics of EE tape.

EXPLANATION OF EACH OPERATING PRINCIPLES

Explains amplifier block diagrams and detailed circuit operation principles.

VII. MECHANISM ADJUSTMENT

GUIDE ROLLER LOOSE PLAY ADJUSTMENT

Adjusts the loose play gap of the guide roller for proper tape travel.

MICRO SWITCH POSITION ADJUSTMENT

Adjusts the position of the micro switch (A) relative to the arm cam.

MICRO SWITCH (B) POSITION ADJUSTMENT

Adjusts the position of the micro switch (B) against the stopper.

REEL TABLE HEIGHT ADJUSTMENT

Adjusts the height of the reel table for centered tape take-up.

CAPSTAN SHAFT LOOSE PLAY ADJUSTMENT

Adjusts the capstan shaft for optimal loose play.

BRAKE BAND POSITION ADJUSTMENT AND BRAKE TENSION ADJUSTMENT

Adjusts brake band position and applies specified brake tension.

PINCH ROLLER POSITION ADJUSTMENT

Sets the gap between pinch roller clamp and lever joints.

PAUSE PLUNGER POSITION ADJUSTMENT

Sets the gap between capstan and pinch roller in pause mode.

PINCH ROLLER PRESSURE ADJUSTMENT

Sets the pinch roller pressure to a specified force.

TAPE SPEED ADJUSTMENT

Calibrates tape speed to 7-1/2 ips and 3-3/4 ips.

VIII. HEAD ADJUSTMENT

IX. ELECTRICAL ADJUSTMENT

CLOCK FREQUENCY ADJUSTMENT

Adjusts the clock frequency using IFT components.

PHOTO TRANSISTOR SENSITIVITY

Adjusts photo transistor sensitivity for balanced pulse widths.

X. DC RESISTANCE OF VARIOUS COILS

XI. CLASSIFICATION OF VARIOUS P.C BOARDS

P.C BOARD TITLES AND IDENTIFICATION NUMBERS

Lists the titles and part numbers of various P.C. boards.

COMPOSITION OF VARIOUS P.C BOARDS

Illustrates the component layout and connections of P.C. boards.

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