Akai GXF 51 Service Manual 2

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III.

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VI.
VII.
VIII.

SECTION 3

SERVICE MANUAL

MODEL GX-F5I

TAB LE OF CONTENTS

SPECIFICATIONS ....................................... 3- 2
CONTROLS ........................................... 3- 3
PRHJCIPAL PARTS LOCATION ............................. 3- 4
VOLTAGE CONVERSION ................................. 3- 5
MECHANICAL ADJUSTMENT .............................. 3- 5
HEAD ADJUSTMENT .................................... 3- 5
AMPLIFIER ADJUSTMENT ................................ 3- 6
TUNING CIRCUIT ADJUSTMENT ............................ 3- 8
DC RESISTANCE 0F HEADS ............................... 3- 9
CLASSIFICATION OF VARIOUS P.C BOARDS .................. 3- 9
1. PC BOARD TITLES AND IDENTIFICATION NUMBERS .......... 3- 9
2. COMPOSITION OF VARIOUS P.C BOARDS ................... 3-10

For has'c adjustments, measuring methods, and eventing 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 i 100% (1-7/8 ips. :1.0%)

HEADS Twin Field Super GX head for recording/playback x 1
Erase head x 1

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 2 3 dB (-20 VU)
00;: 20 to 18,000 Hz 1 3 dB (-20 VU)
Metal: 20 to 19,000 Hz 1 3 dB (-20 VU)

FREQUENCY RANGE

Normal: 15 to 18,000 Hz
00;: 15 to 20,000 Hz
Metal: 15 to 21,000 Hz

SIGNAL TO NOISE RATIO

Metal: Better than 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 harmonic distortion
Metal: Less than 0.8%

INPUT MIC: 0.25 mV (input impedance 5.0 kohms)
Required microphone impedance: 600 ohms
Line: 70 mV (input impedance: 47 kohms)
OUTPUT Line: 410 mV at 0 VU
Required load impedance: 2.0 kohms
Phone: 113 mW/8 ohms at 0 VU
DIN Input: 2.0 mV

Output: 410 mV
Required impedance: more than 20 kohms

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

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

POWER CONSUMPTION

U, C, A Model: 24W
J Model: 22W

DIMENSIONS 440(W) x 100(H) x 345(1)) mm
(17.3 x 3.9 x 13.6")
WEIGHT 6.1 kg (13.4 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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