TEAC GF-480 Service manual

GF-480

Compact Hi-Fi Stereo System

For U.S.A and general export version

NOTES

PC boards shown are viewed from parts side.

The parts with no reference number or no parts number

in the exploded views are not supplied.

As regards the resistors and capacitors, refer to the

circuit diagrams contained in this manual.

Parts marked with this sign are safety critical

components. They must be replaced with identical

components - refer to the appropriate parts list and

ensure exact replacement.

CONTENTS

1 SAFETY INFORMATION

2 SPECIFICATIONS

3 ADJUSTMENT AND CHECKS

3-1 TUNER SECTION

3-2 TURNTABLE SECTION

3-3 CASSETTE DECK SECTION

4 EXPLODED VIEWS AND PARTS LIST

5 PC BOARDS AND PARTS LIST

6 WIRING DIAGRAM

7 INCLUDED ACCESSORIES

GF-480

1 SAFETY INFORMATION

SAFETY INFORMATION

This product has been designed and manufactured according to FDA regulations " title 21, CFR, chapter 1,subchapter J,based on the

Radiation Control for Health and Safety Act of 1968" and is classified as class 1 laser product. There is no hazardous invisible laser

radiation during operation because invisible laser radiation emitted inside of this product is completely confined in the protective

housings. The label required in this regulation is shown .

CAUTION

USE OF CONTROLS OR ADJUSTMENT OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN

HAZARDOUS RADIATION EXPOSURE.

CERTIFICATION

THIS PRODUCT COMPLIES WITH DHHS RULES 21 CFR SUBCHAPTER J APPLICABLE AT DATE OF MANUFACTURE

TEAC. CORPORATION 3-7-3, NAKA-CHO, MUSASHINO-SHI, TOKYO, JAPAN

MANUFACTURED :

LTC

Optical pickup:

Type :SOH-AA-8E15 Manufacturer :SONY CORPORATION

Laser output : Less than 0.35mW on the objective lens Wavelength : 79 0 +/-25nm

CERTIFICATION

THIS PRODUCT COMPLIES WITH DHHS RULES 21 CFR SUBCHAPTER J APPLICABLE AT DATE OF MANUFACTURE

TEAC. CORPORATION 3-7-3, NAKA-CHO, MUSASHINO-SHI, TOKYO, JAPAN

MANUFACTURED :

DOUBLE INSULATION- WHEN SERVICING USE ONLY IDENTIONAL REPLACEMENT PARTS

SERIAL N0.

VOLTAGE SELECTOR

LTC

MADE IN CHINA

120V 230V

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS : (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE AND (2)THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.

THIS CLASS B DIGITAL APPARATUS COMPLIES WITH CANADIAN ICES-003. CET APPAREL NUMERIQUE DE LA CLA SSE B EST CONFORME A LA NORME NMB-003 DU CANADA

MODEL No GF-480

TEAC

Compact Hi-Fi STEREO SYSTEM

TEAC CORPORATION

65W

TOKYO JAPAN

AVIS

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

: RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR.

2 SPECIFICATIONS

GF-480

AMPLIFIER Section

Output Power:

Frequency Response : 60 to 30,000 Hz

10W+10W (U.S.A/Canada)

TUNER Section

FM Section

Frequency Range : 88.0 to 108.00 MHz Sensitivity (S/N 30 dB) : 18 dB uV

AM Section

Frequency Range:

Sensitivity (S/N 20 dB) : 55 dB uV/m

Signal-to-Noise Ratio:

530 to 1710 KHz (U.S.A/Canada)

55dB

CD PLAYER Section

Frequency Response:

Signal-to-Noise Ratio: Wow and Flutter: Channel Separation:

40 to 16,000 Hz +/-5dB 75dB (IEC-A)

Unmeasurable

40dB

CASSETTE DECK Section

Track System: Tape Speed:

Wow and Flutter: Frequency Response: Signal-to-Noise Ratio:

4 track, 2 channel stereo

4.8cm/sec

0.15% (WRMS) 125 to 6,300 Hz +/-2dB 45dB

SPEAKER SYSTEM Section

Type: Impedance:

1-way 8-ohms

GENERAL

Power Requirements:

Power Consumption: Dimension (W x H x D ):

Main Unit:

Weight:

Standard Accessories:

Improvements may result in specification or feature changes without notice.

120V ~, 60Hz (U.S.A/Canada) 120V/230V ~, 50-60Hz (General Export Version only)

65W

386 x 356 x 815 mm (15-3/16 x 14 x 32-1/12)inches

16.5 kg

Owner's Manual x 1

Warranty Card x 1

45rpm Adaptor Rubber pad x 4

GF-480

3 ADJUSTMENTS AND CHECKS

3-1 TUNER SECTION

Use a screwdriver with a plastic or ceramic grip for all adjustment.

3-1-1 FM adjustment

1. Set the function switch to the FM position.

2. Connect the signal generator output through a 75 ohm dummy antenna to "ANT" on MAIN PCB.

3. Connect the oscilloscope to the speaker terminal.

4. Set the signal generator as listed in the alignment chart.

3-1-2 AM adjustment

1. Set the function switch to the AM position.

2. Connect the test loop antenna across the output of the signal generator.

3. Connect the oscilloscope to the speaker terminal.

4. Set the signal generator as listed in the alignment chart.

GF-480 MAIN PCB

AM ANT COIL

PVC

FC1

FC2

3-1-3 FM/AM alignment chart

GF-480

ITEM

1. FM band

2. Tracking

1. IF adjustment

2. AM band

SG SETTING

87.5MHz

1kHz, +/-22.5kHz dev.

108MHz

1kHz, +/-22.5kHz dev.

90MHz

1kHz, +/-22.5kHz dev.

104MHz

1kHz, +/-22.5kHz dev.

Repeat step 2

455kHz 1kHz, 30% mod

530kHz

1kHz, 30% mod

1710kHz

1kHz, 30% mod

TUNER SETTING

87.5MHz

108MHz

90MHz

104MHz

600kHz

530kHz

1710kHz

ADJUSTMENT POINT

PVC FC1

PVC FC2

PVC C1

ADJUSTMENT

Adjust for max.output.

Adjust for max. output and best waveform.

Adjust for max.output.

Adjust for max. output.

600kHz

3. Tracking

3-1-4 TURNTABLE alignment chart

ITEM

TURNTABLE

1kHz, 30% mod

1400kHz

1kHz, 30% mod

Repeat step 3

HP - 4005

Number :

NO.3

NO.4

600kHz

1400kHz

ADJUSTMENT

POINT

VR2

VR3

VR4

SPEED

3000Hz

5200MHz

L4 AM ANT

PVC C2

ADJUSTMENT

+/- 30Hz

Adjust for max. output

and best waveform.

WOW &

Flutter

<0.35%

-----

GF-480

3-2 TURNTABLE SECTION

1. Set function switch to the PHONO position.

2. Connect the oscilloscope to the speaker terminal.

3. Use a HP-4005 record for all adjustment.

3-3 CASSETTE DECK SECTION

PHONO SPEED PCB

VR2 VR3 VR4

3-3-1 Tape speed adjustment

1. Place the function switch in the TAPE position.

2. Connect the frequency counter to the speaker terminal.

3. Load tape decks with MTT-111N (use the midpoint of side A).

4. Press the PLAY button on tape and adjust MOTOR VR to obtain 3,000Hz +/- 30Hz.

5. Stop tape .

3-3-2 Azimuth adjustment

1. Connect the oscilloscope to the speaker terminal.

2. Load a MTT-114N test tape and press the PLAY button.

3. Adjust the azimuth using a screwdriver to maintain the max.

L & R out voltage.

4. Secure the azimuth position using locking paint.

+ 14 hidden pages