Akai GXC-750

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SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
SPECIFICATIONS © os5.25% 9: socket cov ttah eit hh je herslte ale di ben inde de ated te ane bmunlerde Seteak A ded
D.C. RESISTANCE OF VARIOUS COILS .......0 00000. eee
MEASURING METHOD ............0.. 00.00. cece teen teen e eens
'FAPE-, SPEED: “DEVIATION ‘s.0..5 oh te oe eee ee he eed thot dk ads Gaede
WOW AND FLUTTER ....... ated laches aaes eect ON ans ncdatusy tx 2h lel neat
FREQUENCY “RESPONSE: oes aedateuss Sas tenouse wa aa aide a eis hy Boh Des bed Ga eed
SIGNAL ‘TO NOISE RATIO: scence aR aes Sa a ead, RG
TOTAL HARMONIC DISTORTION FACTOR — .... 2... ees
CROSS TALK (Cross talk ‘between the tracks) 2.0.0.2... 0.0 e ee eee ee eee
SERASE “RATIO” |i co2nacg anit tent ne tb aie cgclaee Sade a ash aad ar ea feeder
DISMANTLING: OF CUNDD s..:6 uci nen tint eck at eae ae Aah hale weeded aes
MECHANISM ADJUSTMENT ......0000 00000 cece eee
. ADJUSTMENT OF FWD<*REV CHANGE MICRO SWITCHS ..................
. FLYWHEEL LOOSE PLAY ADJUSTMENT .........0. 0.000000... cece eee
NUHRUAPWNeE
. EJECT SLIDE ADJUSTMENT |. ictiias i wre eeica eee ne ee oa
. REWIND TORQUE AND MEASURING METHOD AT VARIOUS MODES .......
. HOW TO INSTALL CAPSTAN BELT... 1... Le cee
HEAD ADJUSTMENT ...................00.00-. (ima galas sek ual age faker ee
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1. PRE-AMP BLOCK DIAGRAM ........... 0.0.0.0 e ee eens
2,. PLAYBACK .LEVEL ADJUSTMENT -i.cy sc csceca cae ee eb aE aaa:
3. RECORDING LEVEL ADJUSTMENT... 2.2.2. ce
4. FREQUENCY RESPONSE ADJUSTMENT ... 2.0.2... ees
5. RECORDING BIAS FREQUENCY CHECK ......... 0.000000 eee
6. RECORDING BIAS VOLTAGE AND ERASE VOLTAGE CHECK ...............
7. DOLBY N.R. SYSTEM CIRCUIT ADJUSTMENT ..................0.-.00200-5
EXPLANATION OF MECHANICAL FUNCTIONS .....00..0.00.0 000200000 cea
12-KICK “MECHANISM: y:.0:% 4 Seca ee Sigg a end eek ee a lee Dear es ieee Cee ay
2. REVERSE SELECTOR OPERATING MECHANISM .... 0.02... cee ee
3. RECORDING/PLAYBACK HEAD RAISING AND LOWERING
MECHANISM FUNCTION ...........
SYSTEM CONTROL CIRCUIT OPERATION .......0...0.00.0 200.0 ccc ee ee
1. DURING: TAPE. TRAY BIG va cyscteecs ait depth ace de ie ag Gnd ogre eb dvradhen oF Ph ae ee
2, OPERATION WHEN READ SWITCH IS “ON” AND
TAPE TRAVEL IS STOPPED ............
3. OPERATION WHEN READ SWITCH IS “OFF” AND TAPE
TRAVEL IS STOPPED ...............
4. MEMORY WIND OPERATION ©. 200 cetea wed ene Rha wa delw eg Kile Hie wean pete
5. SYSCON MALFUNCTION PREVENTION CIRCUIT .................-..0-..44.
DOLBY N.R. CIRCUIT OPERATION ..........0.0 0000. eee
1. RECORDING DOLBY N.R. SYSTEM ... 0... eee
2. PLAYBACK, DOLBY N.R.SYSTEM. ss c24 seca es hee Sear ee Sa ee ee a Lees
A.D.R. SYSTEM AND O.L.S. CIRCUIT OPERATION ...... 0.2.2.0 oe ee es
1. OPERATING PRINCPALS OF A.D.R.
(AUTOMATIC DISTORTION REDUCTION) SYSTEM ..............0..055.
2. O.L.S. (OVER LEVEL SUPPRESSOR) CIRCUIT OPERATION ..................
COMPOSITE VIEWS OF COMPONENTS .... 0.2200. ee