Akai GXC-570D

i.
Ill.
VIL.
VIM.
SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
TECHNICAL DATA: scien su cles ser stig oa aoe wees 4
DISMANTLING OF UNIT 2255.5/2043, se ee Ge Seca deecees 5
PRINCIPAL PARTS LOCATION ..........0-20-0002ecceeeeeeeee 7
CIRCUIT OPERATING PRINCIPLES .............. Pp snse. cateret 8
1. SYSTEM CONTROL OPERATION ..........-2--2002002000- 8
2. TOUCH BUTTON SYSTEM OPERATION ............-2.-2-5- 12
MECHANISM ADJUSTMENT .........---2--20200 ccc eee eee 14
1. CAPSTAN SHAFT LOOSE PLAY ADJUSTMENT ”............-- 14
2. MOTOR PULLEY INSTALLATION POSITION ADJUSTMENT ..... 14
3. REEL TABLE INSTALLATION POSITION ADJUSTMENT ........ 14
4. PINCH ROLLER PRESSURE ADJUSTMENT ...............-- 15
5. PLAY SOLENOID INSTALLATION POSITION ADJUSTMENT ..... 15
6. ADJUSTMENT OF EJECT MICRO SWITCH ACTUATION POSITION. 16
7. ADJUSTMENT OF RECORDING MICRO SWITCH (SW3) AND
CASSETTE MICRO SWITCH (SW6) ACTUATING POSITION .. 16
8. REEL MOTOR (GSM-300) REPLACEMENT ..........--.--+-- 17
9. FRONT PANEL LID CASE SPACING ADJUSTMENT ........... 17
10. POSITION ADJUSTMENT OF LID CASE ............-----0-- 18
11. CLEARANCE ADJUSTMENT BETWEEN HALL IC AND
ROTARY MAGNETS: 9609 aden bogs cry eae ewevsaues 18
HEAD ADJUSIMEND ©. 2..6.044 4 222i o$vass ow ee eae kee twas 19
1. TAPE GUIDE HEIGHT ADJUSTMENT..........-...-2..-05- 19
2, . HEIGHT ADJUSTMENT OF RECORDING/PLAYBACK
COMBINATION HEAD...........--200-0005- uasaes 19
3. AZIMUTH ALIGNMENT ADJUSTMENT OF
RECORDING/PLAYBACK COMBINATION HEAD.......... 19
AMPLIFIER ADJUSTMENT ...........-0 02002002 cece eee ee ee 20
1. RECORDING/PLAYBACK AMPLIFIER ADJUSTMENT .......... 22
2. DOLBY NOISE REDUCTION CIRCUIT ADJUSTMENT .......... 23
3. RECORDING DOLBY NOISE-REDUCTION AMPLIFIER
JADTUSTMENT scx S4 cieonca wi tone a a8 Marmara oz 23
4, PLAYBACK DOLBY NOISE REDUCTION AMPLIFIER
ADJUSTMENT ...........-..-- sens Dease eases 23
DC RESISTANCE OF VARIOUS COILS ...... 2.222200 -0 002 eee ee 24
CLASSIFICATION OF VARIOUS P.C BOARDS ..........-...--.+- 25
1. RELATION OF VARIOUS P.C BOARDS TITLE AND. NUMBER ..... 25
2. COMPOSITION OF VARIOUS P.C BOARDS ....... wseuiated, gush sew rea 26
For basic adjustments, measuring methods, and operating principles, refer to GENERAL OPERATING
PRINCIPLES AND ADJUSTMENTS. ;
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