Akai GXF 31 Service Manual 2

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SECTION 2

SERVICE MANUAL

MODEL GX-F3I

TABLE OF CONTENTS

I. SPECIFICATIONS ....................................... 2- 2
II. CONTROLS ........................................... 2- 3
III. PRINCIPAL PARTS LOCATION ............................. 2- 4
IV. VOLTAGE AND CYCLE CONVERSION ........................ 2- 5
V. MECHANICAL ADJUSTMENT .............................. 2- 6
VI. HEAD ADJUSTMENT .................................... 2- 9
VII. AMPLIFIER ADJUSTMENT ................................ 2-11
VIII. DC RESISTANCE 0F HEADS ............................... 2-13
IX. CLASSIFICATION OF VARIOUS P.C BOARDS .................. 2-13

1. RC BOARD TITLES AND IDENTIFICATION NUMBERS .......... 213

2. COMPOSITION OF VARIOUS P.C BOARDS ................... 2-14

For basic adjustments, measuring methods, and operating principles, refer to GENERAL TECHNICAL
MANUAL.

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I. SPECIFICATIONS

TRACK SYSTEM

4 Track 2 Channel Stereo System

TAPE Philips Type Cassette

TAPE SPEED 4.76 cm/s t 1.0% (1-7/8 ips. 1 1.0%)

HEADS Twin Field Super GX head for recording/playback x l
Erase head x l

MOTORS FG servo DC. motor for direct capstan drive x 1

DC. motor for reel drive x 1

WOW & FLUTTER

0.10% WTD (DIN)
0.035% WRMS

TAPE WINDING TIME

90 sec. using a C-60 cassette tape

FREQUENCY RESPONSE Normal: 20 to 17,000 Hz :3 dB
00;. 20 to 18,000 Hz 13 dB
Metal: 20 to 19,000 Hz :3 dB
FREQUENCY RANGE Normal; 15 to 18,000 Hz
C00,: 15 to 20,000 Hz
Metal: 15 to 21,000 Hz
SIGNAL TO NOISE RATIO Metal: 60 dB

(measured via tape with peak recording level)

Dolby B-type NR switch ON: Improves up to 5 dB at 1 kHz, 10 dB
above 5 kHz

Dolby C-type NR switch ON: Improves up to 15 dB at 500 HZ, 20 dB
at 1 kHz to 10 kHz

HARMONIC DISTORTION

1 kHz, 3rd hannonic distortion

Metal: 018%
INPUT MIC: 0.25 mV (600 ohms)
Line: 70 mV (47 kohms)
OUTPUT Line. 410 mV (less than 2 kohms)
Phone: 1.3 mW (8 ohms)
DIN Input: 20 mV (10 kohms)
Output: 410 mV

POWER REQUIREMENTS

100V, 50/60 Hz for Japan

120V, 60 Hz for USA and Canada

220V, 50 Hz for Europe except UK

240V, 50 Hz for UK and Australia

110V/120V/220V/240V, 50/60 Hz switchable for other countries.

POWER CONSUMPTION

U, C, A Models 22W
J Mode] 20W

DIMENSIONS 440(W) x 100(H) x 345(1)) mm
(17.3 x 3.9 x 13.6")
WEIGHT 518 kg (12.8 lbs)

* For improvement purposes, specifications and design are subject to change without notice.
* Dolby" and the Double D symbol are trademarks of Dolby Laboratories.
(Manufactured under license from Dolby Laboratories).

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