Akai GX-4000D Service Manual

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SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
TECHNICAL: DATA 33:57. 220 bel cao aaa ee ae Fea 4
Is, “MODEL ‘GX-4Q00D 5. i2s.0 Bon ee fp avetain ates we yet 4
2. ‘MODEL -GX-4000DB -. ». 025600 4 ecg ets aan ee adiae gy Hoe 0s 5
DISMANTLING OF UNIT... 0... ee eens 6
CONTROLS: (feet fn susie aiden geal a inet tare wh 4 ae eae ks 8
PRINCIPAL PARTS LOCATION ........ 0.0.0.0. 0 cee eee eens 10
MECHANISM ADJUSTMENT .......... 0.000. c eee ee eee 11
1. PINCH ROLLER PRESSURE MEASUREMENT ..............-.. il
2. REEL TABLE BLOCK ADJUSTMENT .......... 00000000 eeu 1}
3. DRIVE BELT POSITION ADJUSTMENT ..............-.0005- 13
4. FLYWHEEL LOOSE PLAY ADJUSTMENT ............ 0.00000 13
5. AUTOMATIC SHUT-OFF OPERATING POINT ADJUSTMENT ...... 13
HEAD ADJUSTMENT ............0 0c c eee cece eee eens 14
1. HEAD HEIGHT ADJUSTMENT ....... 0.0.0.0 0. 000 cee eee 14
2. HEAD AZIMUTH ALIGNMENT ADJUSTMENT .............00. I4
3. HEAD ANGLE ALIGNMENT ADJUSTMENT ...........-..00-. 15
AMPLIFIER ADJUSTMENT ......... 00.00.00 ce cece eee eee es 16
Ts, MODEL GX4000D 12865 oss ig s song ah Ee peal Se eS 2s 16
2, “MODEL:.GX-4000DB:.. 022-3 fa ade ee ata alee ees 2 aes 18
DC RESISTANCE OF VARIOUS COILS ........... 00-0000 002 eee 20
CLASSIFICATION OF VARIOUS P.C BOARDS .........2...-.0-45 20
1. P.C BOARD TITLE AND IDENTIFICATION NUMBER ........... 20
2. MODEL GX-4000D COMPOSITION OF VARIOUS P.C BOARDS..... ak
3. MODEL GX-4000DB COMPOSITION OF VARIOUS P.C BOARDS .... 26
For basic adjustments. measuring methods. and operating principles, refer to GENERAL TECHNICAL
MANUAL.
ve

Akai GX-4000D Specifications

General

Track System	4-track, 2-channel, stereo/monaural system
Reel Size	Up to 7 inch reel
Tape Speeds	3 3⁄4 7 1⁄2 ips
Frequency Response	30Hz to 24kHz (7 1⁄2 ips)
Type	Reel to Reel
Heads	1 x erase
Motor	1 x capstan, 1 x reel
Wow and Flutter	0.08% (7.5 ips)
Output	0.775V (line)
Input	70mV (line)
Inputs	Line
Outputs	Line