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SERVICE MANUAL
GF-600
Compact Hi-Fi Stereo System
NOTES
CONTENTS
PC boards shown are viewed from parts side.
1 SAFETY INFORAMTION..............................
2
Parts marked with * require longer delivery time.
2 SPECIFICATIONS.......................................
3
3 ADJUSTMENT AND CHECKS.......................
4
The parts with no reference number or no parts number in the
exploded views are not supplied.
3-1 AMPLIFIER SECTION................................
4
3-2 TUNER SECTION.....................................
5
As regards the resistors and capacitors, refer to the circuit
diagrams contained in this manual.
3-3 CD PLAYER SECTION...............................
7
Parts marked with this sign are safety critical
3-4 CASSETTE DECK SECTION......................
8
components. They must be replaced with identical
3-5 TURNTABLE SECTION..............................
10
components ­ refer to the appropriate parts list and
4 EXPLODED VIEWS AND PARTS LIST............
11
ensure exact replacement.
5 PC BOARDS AND PARTS LIST.....................
21
Parts of [] mark can be used only with the version designated.
6 WIRING DIAGRAM......................................
28
[US]:U.S.A.[C]:CANADA[SA]:SOUTH AMERICA


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GF-600
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 1986" 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 below.
CAUTION
USE OF CONTROLS OR ADJUSTMENT OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HERE
IN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
Optical pickup:
Type
:
SLD104u
Manufacturer
:
SONY Corporation
Laser output
:
Less than 0.5mV on the objective lens
Wavelength
760 ­ 800 nm
2


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GF-600
2 SPECIFICATIONS
AMPLIFIER Section
SPEAKER SYSTEM Section
Output Power......................................................15W+15W
Type......................................................2-way bass reflex
Input Sensitivity........................................................220mV
Impedance...........................................................6 ohms
Frequency Response.....................................50 to 20,000 Hz
GENERAL
Power Requirements........120V, 60Hz (U.S.A./Canada model)
TUNER Section (FM)
120V/230V AC, 50-60Hz (General export model)
Frequency Range...................................87.50 to 108.00 MHz
Power Consumption...................................................50W
Sensitivity (S/N30dB)................................................20dBµV
Dimension ( W x H x D )
Main Unit........................................395 x 379 x 277 mm
(15-9/16" x 14-15/16" x 14-13/16")
TUNER Section (AM)
Speaker.......20 x 172 x 377 mm (7-7/8" x 6-3/4 x 14-13/16")
Frequency Range........................................530 to 1710 kHz
Weight
Sensitivity (S/N20dB).............................................60dBµV/m
Main Unit............................................11.6 kg (25-1/2 lb)
Speaker.........................................2.8 kg (6-3/16 lb ) x 2
CD PLAYER Section
Frequency Response...........................20 to 20,000Hz (±1dB)
Standard Accessories
Signal-to-Noise Ratio.................................................. 55dB
Remote Control Unit (RC-905) x 1
Wow and Flutter.............................................Unmeasurable
45 RPM adaptor x 1
Owner's Manual x 1
Warranty Card x 1
CASSETTE DECK Section
Track System..................................4 track, 2 channel Stereo
Tape Speed........................................................4.8cm/sec
Design and specifications are subject to change without
notice.
Wow and Flutter...........................................0.35% (WRMS)
Illustrations may differ slightly from production models
Frequency Response.....................................100 to 8,000 Hz
Signal-to-Noise Ratio...................................................35dB
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 2.5% (WRMS)
S/N ratio........................................................More than 50dB
Cartridge type.................................Ceramic Stereo Cartridge
3


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GF-600
3 ADJUSTMENT AND CHECKS
0 dB is referenced to 1.0V.
Load impedance:
SPEAKERS: 6 ohm (40W or more)
PHONES: 1k ohm (1/4W)
Specified input level: -3dB (AUX)
VOLUME position: VOL 20
Unless specified otherwise,measurements are made in PHONES jack
3.1
AMPLIFIER SECTION
ITEM
INPUT SIGNAL
(AUX IN)
SPECIFICATIONS
REMARKS
1.AUX input sensitivity
1KHz /-3dB
-4 +/-3dB
Reference output level
2.Harmonic distortion
1KHz /-3dB
1.0% or less
3.Frequency response
40Hz,100Hz,20kHz
40Hz: 9 +/-3dB
100Hz: 7 +/-3dB
20kHz: 3 +/-3dB
Reference level:1kHz
4.S/N ratio
No signal
50dB or better
Ratio of reference output
level to noise
5.Maximum output power
1KHz
THD:10% or less
VOLUME: MAX
4
Oscillator
AUX IN
L
R
GF-600
PHONES
SPEAKERS
6 ohm
1k ohm
1k ohm
S1
Distorion
Analyzer
AC voltmeter
Oscilloscope
Fig.3-1 Basic test setup
6 ohm


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GF-600
3-2
TUNER SECTION
3-2-1 AM TUNER
SIGNAL GENERATOR SETTING
ITEM
Audio
Modulation
Frequency
Output
GF-600
ADJUSTMENTS
MEASURING
POINTS,RESULT
1710kHz
L5
VT 8.0V
1.Voltage
adjustment
530kHz
Check
VT 0.9V
2.IFT
adjustment
1kHz
30%
600kHz
76 dBuV
600kHz
L4
Maximum output
level
1kHz
30%
600kHz
76 dBuV
600kHz
Ant coil
Maximum output
level
3.Tracking
adjustment
1kHz
30%
1400kHz
76 dBuV
1400kHz
TC2 Repeat
step 3
Maximum output
level
5
SPEAKER
JK2
SW1
AUX INPUT
JK1
IC6
IC5
IC
IC3
IC2
VR1
IC1
L1
L2
L5
FIG 3-2 Adjustment locations
L3
L8
A
M
A
N
T
IC7
C304
C303
Q31
TC4
TC2
GF-600 MAIN PCB
L4