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KS-F171-G
Service Manual
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Jvc KS-F171-G Service Manual

SERVICE MANUAL
CASSETTE RECEIVER
MA00720038
KS-F171G
S.BASS
SEL
DISP
Area Suffix
UN ------------- Asean
TABLE OF CONTENTS
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.MA007
2003/8

SPECIFICATION

BAGIAN AMPLIFIER AUDIO
Bagian Radio Batas Frekuensi FM 87.5 MHz hingga 108.0 MHz
Bagian Dek Kaset Bagian Dek Kaset 0.15% (WRMS)
UMUM Power yang diperlukan Tegangan Operasional DC 14.4 V
Output power maksimum Depan 45 watt per chanel
Belakang 45 watt per chanel
Output Power kontinyu (RMS)
Impedansi beban 4 Ω (toleransi antara 4 Ω hingga 8 Ω) Batas tone kontrol Bass ±10 dB pada 100 Hz
Respon Frekuensi 40 Hz hinga 20 000 Hz Rasio Sinyal ke suara 70 dB Level Line-Out/ impedansi 1.0V/beban 20 kΩ (250 nWb/m)
[Radio FM] Sensitivitas yang dapat digunakan 11.3 dBf (1.0 µV/75 Ω)
[Radio AM] Sensitivitas 20 µV
Waktu Menggulung cepat 190 detik (C-60) Respon Frekuensi 50 Hz hingga 14 000 Hz (tape normal) Rasio Sinyal ke suara 52 dB Pemisah Stereo 40 dB
Temperatur kerja yang diperbolehkan 0ºC hingga +40ºC Dimensi (L × T × K) Ukuran pemasangan 182 mm × 52 mm × 150 mm
Berat 1.3 kg (tidak termasuk aksesoris)
Depan 17 watt per chanel dalam 4 Ω, 40 Hz hingga 20
000 Hz dengan tidak lebih dari 0.8% distorsi harmonis total.
Belakang 17 watt per chanel dalam 4 Ω, 40 Hz hingga 20
000 Hz dengan tidak lebih dari 0.8% distorsi harmonis total.
Treble ±10 dB pada 10 kHz
AM 531 kHz hingga 1 602 kHz
50 dB Sensitivitas Ketenangan 16.3 dBf (1.8 µV/75 Ω) Selektivitas Chanel Alternatif
(400 kHz) Respon Frekuensi 40 Hz hingga 15 000 Hz Pemisah Stereo 35 dB Rasio penangkapan 2.0 dB
Selektivitas 35 dB
Sistem Grounding Ground Negatif
Ukuran panel 188 mm × 58 mm × 11 mm
65 dB
(diperbolehkan antara 11V hingga 16 V)
Desain dan spesifikasi dapat berubah tanpa pemberitahuan.
1-2 (No.MA007)

1.1 Safety Precautions

SECTION 1
PRECAUTION
!
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.
(No.MA007)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.MA007)
SECTION 3
DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly (See Fig.1)
(1) Press the release button and remove the front panel as-
sembly.
3.1.2 Removing the bottom cover (See Fig.2)
• Prior to performing the following procedure, remove the front
panel assembly. (1) Turn the body upside down. (2) Insert a screwdriver under the joints to release the two
joints a on the left si de, the two joints b on the right side and the joint c on the back of the body, then remove the bottom cover from the body.
CAUTION:
When releasing the joint c using a screwdriver, do not damage the board.
Front panel assembly
Release button
Fig.1
Bottom cover
Joint b
Joint a
3.1.3 Removing the front chassis (See Fig.3)
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover. (1) Remove the screw A on each side of the body. (2) Release the two joints d and th e two joints e on the sides,
then remove the front chassis toward the front.
Joint a
Joint c
Fig.2
Joint d Joint e
A
Joint d
Front chassis
Fig.3
Joint e
Joint b
(No.MA007)1-5
3.1.4 Removing the heat sink (See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly. (1) Remove the screw B and two screws C attaching the heat
sink on the left side of the body, and remove the heat sink.
3.1.5 Removing the rear panel (See Fig.5 )
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover. (1) Remove the two screws D, one screw E and three screws
F attaching the rear panel on the back of the body.
D
C
B
Heat sink
Fig.4
C
FF
3.1.6 Removing the main board (See Fig.6)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink and rear panel. (1) Remove the two screws G attaching the main board on the
top chassis.
(2) Disconnect the two connectors CN901
main board from the cassette mechanism assembly.
and CN721 on the
E
CN721
G
D
Fig.5
Main board
G
CN901
1-6 (No.MA007)
Fig.6
3.1.7 Removing the cassette mechanism assembly
(See Fig.7)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear panel and main board. (1) Remove the four screws H attaching the cassette mecha-
nism assembly from the top chassis.
H
Cassette mechanism assembly
H
3.1.8 Removing the head amplifier board
(See Fig.8)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear panel, main board and cassette mechanism assembly. (1) Disconnect the wire from CJ901
board.
(2) Remove the one screw J attaching the head amplifier
board.
(3) Move the head amplifier board in the direction of the arrow
to release the two joints f, the head amplifier board can be removed.
3.1.9 Removing the relay board
(See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear panel, main board and cassette mechanism assembly. (1) Disconnect the wire from CP722 (2) Remove the one screw K attaching the relay board. (3) Move the relay board in the direction of the arrow to release
the joint g, the relay board can be removed.
on the head amplifier
on the relay board.
H
CJ901
Joint f
To head relay board
Top chassis
Fig.7
Head amplifier board
Joint f
J
Fig.8
Relay board
H
CP722
Joint g
Fig.9
K
(No.MA007)1-7
3.1.10 Removing the mecha bracket (See Fig.10)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear panel, main board, cassette mechanism assembly, head am­plifier board and relay board. (1) Remove the four screws L attaching the mecha bracket.
3.1.11 Removing the switch (LCD & key) board (See Fig.11~13)
• Prior to performing the following procedure, remove the front
panel assembly. (1) Remove the four screws M attaching the rear cover on the
back of the front panel assembly.
(2) Release the eleven joints h, the front panel and the rear
cover become separate.
(3) Remove the switch board from the rear cover.
L
L
M
Mecha bracket
L
L
Fig.10
M
Joint h
M M
Fig.11
Joint h
Joint h
Joint h
Fig.12
Switch (LCD & Key) board
1-8 (No.MA007)
Fig.13

3.2 Cassette mechanism assembly

• Prior to performing the following procedures, remove the head
amplifier board, the relay board and the mechanism bracket.
3.2.1 Removing the direction switch board
(See Fig.1)
(1) Unsolder the three wires a on the direction switch board. (2) Remove the one screw A attaching the direction switch
board.
3.2.2 Removing the FF / REW lever assembly
(See Fig.1)
(1) Remove the screw B attaching the FF / REW lever assem-
bly on the back of the cassette mechanism assembly.
(2) Remove the screw C on the upper side of the FF / REW
lever assembly.
(3) Lift and pull forward the FF / REW lever assembly to disen-
gage the joints b, c, d and e.
3.2.3 Reattaching the FF / REW lever assembly
(See Fig.1)
(1) Reattach the FF / REW lever assembly to the joint c on the
back of the chassis.
(2) Reattach the pinch-roller shaft e, the chang e lever d and
the return link e to the chassis.
C
FF / REW lever assembly
Joint c
3.2.4 Removing the playback head (See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly. (1) Remove the screw D attaching the playback head. (2) Remove the C washer and pull out the FF roller. (3) Remove the S support plate, the A arm spring (a) and (b),
the playback head.
ATTENTION:
The A arm spring (a) differs from the A arm spring (b).
3.2.5 Removing the pinch-roller (R) and (F) assembly (See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly. (1) Remove the P arm spring (f) in the pinch-roller (F) assem-
bly from the chassis.
(2) Remove the P arm spring (r) in the pinch-roller (R) assem-
bly from the chassis.
(3) Draw out the pinch roller (F) and (R) assembly from the
shaft.
ATTENTION:
The P arm spring (f) differs from the P arm spring (r).
ATTENTION:
The pinch roller (F) assembly differs from the pinch roller (R) assembly.
Joint e
Joint d
A
Soldering a
Direction switch board
Fig.1
Pinch-roller (R) assembly
Shaft
Remove the P arm spring (r) from the chassis.
Joint b
B
C washer
A arm spring (b)
FF roller
S support plate
D
Playback head
Pinch-roller (F) assembly
A arm spring (a)
Shaft
Remove the P arm spring (f) from the chassis.
P arm spring (r)
P arm spring (f)
Fig.2
(No.MA007)1-9
3.2.6 Removing the cassette hanger / cassette holder (See Fig.3)
• Prior to performing the following procedure, remove the FF /
REW lever assembly. (1) From the rear of the unit, bend the two tabs f outwards and
disengage the two joints g in the direction of the arrow.
(2) Push the eject lever and remove the cassette holder from
the playback head. Disengage the two joints h of the cas­sette hanger / cassette holder and the eject lever in the di­rection of the arrow.
(3) Lift the cassette hanger / cassette holder an d disengage
the joint i of the return link and the eject lever.
Cassette holder
Cassette hanger
Chassis
Return link
Joint i
Eject lever
Joint h
Joint h
3.2.7 Removing the reel disc assembly (See Fig.4)
• Prior to performing the following procedure, remove the FF /
REW lever assembly and the cassette hanger / cassette hold­er. (1) Remove the C washer and pull out reel disc assembly.
ATTENTION:
Replace with a new C washer when reattaching.
3.2.8 Removing the motor assembly (See Fig.5)
(1) Unsolder the two wires j on the motor assembly. (2) Turn over the cassette mech anism assembly and remove
the main belt and the sub-belt from the motor pulley.
ATTENTION:
The main belt can now be removed.
(3) Remove the two screws G attaching the motor assembly.
Joint g
Flywheel (BF)
Tab f
C washer
C washer
Tab f
Fig.3
Fig.4
Main-belt
E
Joint g
Reel disc assembly
Motor assembly
Sub-belt
G
Motor pulley
1-10 (No.MA007)
Flywheel (BR)
Reel base assembly
E
Fig.5
G
Soldering j
E
F
3.2.9 Removing the Flywheel (BF) and (BR) assembly
(See Fig.4 and 5)
• Prior to performing the following procedure, remove the cas-
sette hanger / cassette holder. (1) From the upper side of the cassette mechanism assembly,
remove the C washer from each shaft of the flywheel (BF) and (BR).
(2) Turn over the cassette mechanism assembly and remove
the main belt. Pull out the flywheel (BF) and (BR) down­ward respectively.
C washer
Reel disc assembly
C washer
Fig.4
Main-belt
Motor assembly
3.2.10 Removing the reel base assembly (See Fig.5 and 6)
(1) Raise the part k o f the reel ba se assembly slightly and re-
move the selector link (B) on the front side of the cassette mechanism assembly by turning it as shown in Fig.6.
(2) Remove the three screws E a nd the one screw F on the
underside of the cassette mechanism assembly.
ATTENTION:
The reel base assembly is not repairable. Handle with care.
Pinch-roller (R) assembly
k
Selector link (B).
Turn the selector link (B).
Fig.6
Inside of the reel base assembly
Flywheel (BF)
Flywheel (BR)
Sub-belt
E
Reel base assembly
E
Fig.5
Motor pulley
G
E
F
G
Soldering j
Fig.7
(No.MA007)1-11
3.2.11 Removing the mute switch board (See Fig.8)
(1) Unsolder the two wires l on the mute switch board on the
back of the cassette mechanism assembly.
(2) Remove the screw H attaching the mute switch board.
3.2.12 Removing the power switch (See Fig.9)
• Prior to performing the following procedure, remove the motor
assembly. (1) Unsolder the two wires m on the po wer sw itch on the side
of the cassette mechanism assembly.
(2) Remove the screw I attaching the power switch.
Cassette mechanism assembly
Soldering l
H
Fig.8
Soldering m
I
Cassette mechanism assembly
Power switch
Fig.9
Rower switch
Motor assembly
Mute switch board
1-12 (No.MA007)
SECTION 4
ADJUSTMENT

4.1 Adjustment method Test instruments required for adjustment

(1) Digital oscilloscope (100MHz) (2) Frequency counter meter (3) Electric voltmeter (4) Wow & flutter meter (5) Test tapes
• VT724...........................For DOLBY level measurement
• VT739..............For playback frequency measurement
• VT712....For wow flutter & tape speed measurement
• VT703........................For head azimuth measurement
(6) Torque gauge............................Cassette type for CTG-N
Measuring conditions (Amplifier section)
• Power supply voltage.............. DC14.4V (11V to 16V allowance)
• Load impedance............ 4Ω (4Ω to 8Ω allowance)
• Line out level/Impedance..............1.0V/20k load (250 nWb/m)
Standard volume position
Balance and Bass, Treble volume, Fader : Center (Indication "0") Loudness, Dolby NR, Sound, Cruise : Off Volume position is about 2V at speaker output with following conditions, Playback the test tape VT721.
AM mode 999kHz/62dB, INT/400Hz, 30%
modulation signal on receiving.
FM mono mode 97.9MHz/66dB, INT/400Hz, 22.5kHz
deviation pilot off mono FM stereo mode 1kHz, 67.5kHz dev. pilot 7.5kHz dev. Output level 0dB (1µV,50Ω/open terminal)
(No.MA007)1-13
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