This is the 58 pages manual for Akai GX 620 Service Manual.
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STE R E0 TA P E I) EC K
MODEL GX'620
ALSO APPLICABLE TO BLACK PANEL MODEL
SECTION I SERVICE MANUAL .................... 3
SECTION 2 PARTS LIST .......................... 37
SECTION 3 SCHEMATIC DIAGRAM ................ 55
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SECTION I
SERVICE MANUAL
TABLE OF CONTENTS
TECHNICAL DATA .......................................
DISMANTLING OF UNIT ...................................
CONTROLS ............................................
RINCIPAL PARTS LOCATION ..............................
VOLTAGE AND CYCLE CONVERSION .........................
. VOLTAGE CONVERSION ................................
. CYCLE CONVERSION ...................................
VI. CIRCUIT OPERATING PRINCIPLES ...........................
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. CIRCUIT CONSTRUCTION OF [Cl M54410? ...................
. THE SAMPLE AND HOLD SYSTEM
SERVO MOTOR (SCM-ZOO) OPERATION ............
VII. MECHANISM ADJUSTMENT ................................
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2
3.
4
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7
8
fi*?§
1
2
. TAPE GUIDE HEIGHT ADJUSTMENT ........................
. REEL TABLE HEIGHT ADJUSTMENT .......................
CAPSTAN SHAFT LOOSE PLAY ADJUSTMENT ................
. IMPEDANCE ROLLER LOOSE PLAY ADJUSTMENT .............
. BRAKE BAND POSITION ADJUSTMENT AND
BRAKE TENSION ADJUSTMENT .................
. PINCH ROLLER PLUNGER INSTALLATION AND
PINCH ROLLER PRESSURE ADJUSTMENT .........
. PAUSE PLUNGER POSITION ADJUSTMENT ...................
. TAPE SPEED ADJUSTMENT ..............................
. HEAD ADJUSTMENT .....................................
AMPLIFIER ADJUSTMENT .................................
DC RESISTANCE OF VARIOUS COILS .........................
CLASSIFICATION OF VARIOUS P.C BOARDS ................. ' . .
. P.C BOARD TITLES AND IDENTIFICATION NUMBERS ...........
. COMPOSITION OF VARIOUS P.C BOARDS ....................
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5
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10
[0
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12
12
14
l7
I7
19
20
20
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22
24
27
28
28
29
For basic adjustments, measuring methods, and opera ling principles, refer to GENERAL TECHNICAL
MANUAL