Akai GX 215 D Service Manual

Page 1

25

VII.

VIII.

SECTION 1

SERVICE MANUAL

TABLE OF CONTENTS

TECHNICAL DATA ................................... 2
DISMANTLING 0F UNIT ............................... 3
CONTROLS 4
PRINCIPAL PARTS LOCATION .......................... 5
MECHANISM ADJUSTMENT ............................ 6
1. REEL TABLE HEIGHT ADJUSTMENT ................... 6
2. BRAKE TENSION ADJUSTMENT ....................... 6
3. LEFT AND RIGHT REEL MOTOR TENSION

AT VARIOUS OPERATING MODES ...... 7
4. FLYWHEEL LOOSE PLAT ADJUSTMENT ................. 7
S. FLYWHEEL BELT POSITION ADJUSTMENT ............... 7
6. SHIFTER LEVER ADJUSTMENT ....................... 8
HEAD ADJUSTMENT ................................. 9
AMPLIFIER ADJUSTMENT ............................. 10
DC RESISTANCE OF VARIOUS COILS ..................... 12
CLASSIFICATIONS OF VARIOUS P.C BOARDS ............... 12
11 RELATION 0F PC BOARD TITLE

AND IDENTIFICATION NUMBER ....... 12
2. COMPOSITION OF VARIOUS P.C BOARDS ................ 13

For basic adjustments, measuring methods, and operating principles, refer to GENERAL
OPERATING PRINCIPLES AND ADJUSTMENTS.

Page 2

I. TECHNICAL DATA

TRACK SYSTEM
REEL CAPACITY

4 track, 2 channel stereo/monaural system
Up to 7" reel

TAPE SPEED

7-1/2 and 3-3/4 ips

WOW AND FLUTTER

FREQUENCY RESPONSE

Less than 0.09% RMS, 0.17% (DIN 45 500) at 7-1/2 ips
Less than 0.18% RMS at 3-3/4 ips

30 to 25,000 Hz :3 dB at 7-1/2 ips -

30 to 19,000 Hz t3 dB at 3-3/4 ips

DISTORTION
SIGNAL TO NOISE RATIO

Less than 1% (1,000 HZ 0 VU)
Better than 56 dB (measured via tape with peak recording level of +6 VU)

ERASE RATIO

Better than 70 dB

BIAS FREQUENCY
HEADS

100 kHz
(3): One GX playback. one GX recording and one erase head

MOTORS

(3): One 4/8 pole self-lubricating hysteresis synchronous capstan drive motor
and two eddy current outer-rotor reel drive motor

FAST FORWARD AND REWIND TIME
OUTPUT JACKS

90 sec using 1,200 ft tape

Line (2): 0.775V (0" VU)

Required load impedance: more than 20 k ohms
Phone (1): 50 mV/8 ohms

INPUT JACKS

Microphone (2): 013 mV/2.2 k ohms
Required microphone impedance: 600 ohms
Line (2): 70 mV/100 k ohms

DIN JACK

Input 0.3 mV/Output 0.5V

SEMICONDUCTORS
POWER REQUIREMENTS

Transistors 27. Diodes 17

CSA, UL and LA Models: 120V, 60 Hz only

CEE Models: 220V, 50 Hz only

Other Models: 110/120/220/240V, 50/60 Hz switchable

DIMENSIONS 380(W) x 390(H) x 295(D)mm
(1510 x 15.4 x11.6")
WEIGHT 15.7 kg (34.6 lbs)

For improvement purposes, specifications and design are chnnged without notice.

Page 19

MEMO

19