TEAC GF-450-K-7 Service manual

GF-450K7

Micro Hi-Fi system

NOTES CONTENTS

PC board 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.

Parts of [ ] mark can be used only with the version

designated.

[USA] - U.S.A.; [JPN] - Japan

1 SAFETY INFORMATION ... .... ... ... .... ... ... .... ... ... .... ... ... .... ... ... ... 2

2 SPECIFICATIONS ... ... .... ... ... .... ... ... .... ... ... .... ... ... .... ... ... .... ... ... .... .. 3

3 ADJUSTMENT AND CHECK ... ... ... .... ... ... .... ... ... .... ... ... .... ... 4

4 EXPLODED VIEW AND PARTS LIST ... .... ... ... .... ... ... .... 8

5 PC BOARDS AND PARTS LIST .. ... ... .... ... ... .... ... ... .... ... .. 12

6 WIRING DIAGRAM ... ... ... .... ... ... .... ... ... .... ... ... .... ... ... .... ... ... .... ... . 18

7 INCLUDED ACCESSORIES .... ... ... .... ... ... .... ... ... .... ... ... .... ... 21

GF-450K7

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NO T REMO V E COVER (O R B A C K ). NO US E RSE RVI CEABLE PAR TS INS IDE . REFE R SERV ICI NG TO QUALIFIED SERVICE PERSONNEL.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

1 SAFETY INFORMATION

Optical pickup :

Type : SF-W37SGT

Manufacturer : SANYO ELECTRIC CO., LTD.

Laser output : Less than 1 mW (Play) on the objective lens

Less than 5 mW (Record) on the objective lens

Less than 10 mW (Erase) on the objective lens

Wavelength : 783 nm

2 SPECIFICATIONS

GF-450K7

Amplifier Section

Output power 3.5 W + 3.5 W Frequency response 60 Hz to 20 kHz

Audio input sensitivity/Impedance AUX: -6dBV(0.5V)/20kΩ

Maximum iutput level AUX:+6dBV(2.0V)

CD Recorder Section

Media type CD-RW and CD-R for Digital audio (record and playback), CD (playback only) Recording sampling frequency 44.1kHz Frequency response 20Hz to 20kHz (playback:±2dB, recording:±3dB) Signal to noise ratio More than 90dB (playback) More than 80dB (recording) Total harmonic distortion Less than 0.05% (playback) Less than 0.07% (recording)

Tuner Section

Frequency range(FM) 87.5MHz to 108.0 MHz (100 kHz step) [USA] Frequency range(AM) 530 kHz to 1,720 kHz (10 kHz step)

Frequency range(FM) 76.0 MHz to 90.0 MHz (100 kHz step) [JPN] Frequency range(AM) 522 kHz to 1,620 kHz (9 kHz step)

Record Player Section

Motor DC servo motor Drive system Belt Drive Speed 33-1/3 rpm, 45 rpm, 78 rpm Wow and Flutter less than 0.35% (WDT) Cartridge type Ceramic Stereo Cartridge Stylus STL-103 Output level 158 -348mV

Cassette tape section

Tracking system 4-track, 2-channel stereo Tape speed 4.8 cm/sec Wow&flutter 0.3% Frequency characteristic 125 to 10,000 Hz S/N ratio 45 dB

Speaker System Section

Unit 70 mm (3”) Impedance 4 ohms

GENERAL

Power requirements 120V, 60Hz [USA] Power requirements 100V, 50~60Hz [JPN] Power consumption 55 W Dimensions (W x H x D) 480 x 230 x 380 mm (18 7/8” x 9 1/16” x 14 15/16”) Weight 11 kg (24 1/4 lb)

Standard Accessories

Owner’s manual x 1 Warranty card x 1 45 RPM adaptor x 1 Remote control unit (RC-992) x 1 [USA] Remote control unit (RC-1069) x 1 [JPN] Battery (AA, R6, SUM-3) x 2 Quick Start Guide for recording x 1 Stereo RCA pin cable x 1

Design and specifications are subject to change without notice. Weight and dimensions are approximate. Illustrations may differ slightly from production models.

GF-450K7

Spec. Limit 1 2 3 UNIT

zHK01-/+525dnE woL

zHK03-/+0371dnE hgiH

zHK5-/+554

m/vuBd8525zHK 006

m/vuBd8525zHK 0001

m/vuBd8525zHK 0041

m/vuBd4685zHK 006

m/vuBd4665zHK 0001

m/vuBd4665zHK 0041

05. I.F.Rejection(Max.Sens)

bd0353zHK 006 ta

bd5203zHK 0041 ta)Vm5(noitcejeR egamI .60

%515.F.1 x 2m/Vm5 ta teewT .70

%//.F.1 x 3

bd5102zHK 0001 tazHK 01-/+.A.C.A .80

zHK9-45

bd0353

%52

W5.36.3

zH521001

zHK22.2

VM013)emuloV niM( esioN & muH .41

bd5304

02. I .F

01. Tuning Range

ITEM

03. MAX. Sens.

04. Sen. For -20db S/N

09. Band Width -6db at 10% 1000khz Max Sens

10. A.G.C.(-10db) at 1000KHz 100db/m

11.T.H.D. 74db/m 30%MOD

12. Power Output at 10% THD 80%74db/m

13. Ferq. Resp. -Low

-6 db High

15. HUM Modulation 100db/m

:DEVORPPA: YB TSET:SKRAMER

3 ADJUSTMENTS AND CHECKS

ALIGNMENT PROCEDURES

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.

3-1-3 Turntable Section

1.Set the function switch to the PHONE position.

2.Connect the oscilloscope to the speaker terminal.

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

3-2 Adjustment and Test Points

120 V UL model Tuner adjustments AM

  



GF-450K7

Spec. Limit 1 2 3 UNIT

zHM5.0-/+5.78dnE woL

zHM5.0-/+5.801dnE hgiH

zHK2.0-/+7.01

bd0231ZHM 09

bd0231zHM 89

bd0231zHM 601

bd6202zHM 09

bd6202zHM 89

bd6202zHM 601

bd8304

06.Image Rejection

at 106MHz

bd8102

bd5152

09. A.F.C Holding

at 98MHz 1mV

300

+/-250

KHz

bd0454

%21

W5.36.3

%0301

zH05105

zHK45.4

VM51

bd5281

bd6203

bd31

bd43

ITEM

01. Tuning Range

02. Intermediate Frequency

03.MAX. Sens.

04. Sen. For -30db S/N

05. I.F.Rejection

07.-3db limiting Sens . at98MHz 1mV

08. A.M.Suppression at 98MHz 1mV

10.S/N Ratio at 98MHz 1mV

11.T.H.D. 22.5KHz DEV.

12. Power Output at 10% THD 75KHz DEV 1mv

Max. v olume T.H.D

13. Ferq. Resp. -6db -Low

High

14. HUM & NOISE (Min. Volume)

01.Stereo Indication Sens.at 98Mhz 75KHz Dev.1KHz

02.Separation at 98 MHz 1mV 40KHz Dev.

03. Channel Balance

04. Stereo Distortion at 98MHz 1mV 45KHz Dev.

Multiplex:

TEST BY : APPROVED:REMARKS

120 V UL model Tuner adjustments FM

  



GF-450K7

100 V JPN model Tuner adjustments

AM I.F. ALIGNMENT

1. Set the POWER BUTTON to POWER "ON".

2. Set the Radio and band button to Radio and AM BAND.

3. Connect a SWEEPSCOPE OUTPUT to AM antenna terminal.

4. Connect a SWEEPSCOPE INPUT to pin17 of IC2 through a 1uf capacitor and ground.

STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR

1 4455KHz GANG OPEN T3

AM R.F. ALIGNMENT

1. Connect an RF generator to a standard radiating loop.

2. Connect a SCOPE and VTVM across the speaker output.

STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR 1 515KHz GANG CLOSED L6 2 1640KHz GANG OPEN PVC-D 3 600KHz 1400KHz L4 4 1400KHz 1400KHz PVC-C 5 REPEAT STEPS 3 AND 4 TO OBTAIN BEST TRACKING.

CENTER &MAXIMUM OUTPUT

MAXIMUM OUTPUT

FM R.F. ALIGNMENT

1. Connect an RF generator to the FM antenna terminal and ground.

2. Connect a SCOPE & VTVM across the speaker output.

STEP SET SIGNAL SET DIAL ADJUST ADJUST FOR 1 76MHz GANG CLOSED L3 2 108MHz GANG OPEN PVC-A 3 90MHz 90MHz L2 4 106MHz 1106MHz PVC-B 5 REPEAT STEPS 3 AND 4 TO OBTAIN MAX ADJUST.

MAXIMUM OUTPUT

MAIN PCB

GF-450K7

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