SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.49847
2003/6
CASSETTE RECEIVER
49847
2003
5
KS-FX771
TABLE OF CONTENTS
1
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
Area Suffix
U ------------------- Other Areas
SOUND
VOL
VOL
SOURCE
R
F
U
D
ATT
1-2 (No.49847)
SPECIFICATION
Design and specifications are subject to change without notice.
AUDIO
AMPLIFIER
SECTION
Maximum Power Output Front
45 W per channel
Rear
45 W per channel
Continuous Power Output (RMS) Front
17 W per channel into 4
40 Hz to 20 000 Hz
at no more than 0.8% total harmonic distortion.
Rear
17 W per channel into 4
40 Hz to 20 000 Hz
at no more than 0.8% total harmonic distortion.
Load Impedance
4
(4 to 8 allowance)
Tone Control Range
Bass
±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response
40 Hz to 20 000 Hz
Signal-to-Noise Ratio
70 dB
Line-Out Level/Impedance
2.0 V/20 k
load (250 nWb/m)
TUNER
SECTION
Frequency Range
FM
87.5 MHz to 108.0 MHz
AM
531 kHz to 1 602 kHz
[FM Tuner]
Usable Sensitivity
11.3 dBf (1.0
µV/75 µ)
50 dB Quieting Sensitivity
16.3 dBf (1.8
µV/75 µ)
Alternate Channel Selectivity (400 kHz)
65 dB
Frequency Response
40 Hz to 15 000 Hz
Stereo Separation
35 dB
Capture Ratio
1.5 dB
[AM Tuner]
Sensitivity
20
µV
Selectivity
35 dB
CASSETTE
DECK
SECTION
Wow & Flutter
0.11% (WRMS)
Fast-Wind Time
100 sec. (C-60)
Frequency Response
30 Hz to 16 000 Hz (Normal tape)
Signal-to-Noise Ratio
56 dB
Stereo Separation
40 dB
GENERAL
Power Requirement
Operating Voltage
DC 14.4 V (11 V to 16 V allowance)
Grounding System
Negative ground
Allowable Operating Temperature
0ºC to +40ºC
Dimensions (W
× H × D) Installation Size (approx.)
182 mm
× 52 mm × 150 mm
Panel Size (approx.)
188 mm
× 58 mm × 12 mm
Mass (approx.)
1.3 kg (excluding accessories)
(No.49847)1-3
SECTION 1
Precautions
1.1
Safety Precautions
!
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
1-4 (No.49847)
SECTION 2
Disassembly method
2.1
Main body
2.1.1
Removing the front panel assembly
(See Fig.1)
(1) Press the release button and remove the front panel as-
sembly.
Fig.1
2.1.2
Removing the bottom cover
(See Fig.2)
· Prior to performing the following procedures, remove the front
panel assembly.
(1) Turn the main body upside down.
(2) Insert a screwdriver under the joints to release the two
joints a on the left side, two joints b on the right side and
joint c on the back side of the main body, then remove the
bottom cover from the main body.
CAUTION:
When releasing the joints using a screwdriver, do not damage
the main board.
Fig.2
2.1.3
Removing the front chassis assembly
(See Figs.3 and 4)
· Prior to performing the following procedures, remove the front
panel assembly and bottom cover.
(1) Remove the two screws A on the both sides of the main
body. (See Fig.3.)
(2) Remove the two screws B on the front side of the main
body. (See Fig.4.)
(3) Release the two joints d and two joints e on the both sides
of the main body, then remove the front chassis assembly
toward the front. (See Fig.3.)
Fig.3
Fig.4
Release button
Front panel assembly
Bottom cover
Joint a
Joint b
Joint a
Joint b
Joint c
Joint d
Joint d
Front chassis assembly
A
Joint e
Joint e
A
B
Front chassis assembly
(No.49847)1-5
2.1.4
Removing the heat sink
(See Fig.5)
· Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws C and screw D attaching the heat
sink on the left side of the main body, and remove the heat
sink.
Fig.5
2.1.5
Removing the rear panel
(See Fig.6)
· Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the two screws E, three screws F and three
screws G attaching the rear panel on the back side of the
main body.
Fig.6
2.1.6
Removing the main board
(See Fig.7)
· Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis assembly, heat
sink and rear panel.
(1) Remove the two screws H attaching the main board on the
top chassis.
(2) Disconnect the connector CP701 on the main board from
the cassette mechanism assembly.
Fig.7
C
D
Heat sink
GG
EE
F
Rear bracket
H
Main board
CP701
H