Kenwood GX-401EF2 Service Manual
CD CASSETTE RECEIVER
GX-401EF2
SERVICE MANUAL
SUBAR U GENUINE
© 2002-9 PRINTED IN JAPAN
B51-7966-00 (N) 1889
DISP
SCAN
MUTE
TUNE/
TRACK
Knob (SEEK)
(K23-1065-04)
Front glass
(B10-4256-03)
LOCAL
AS
LOUD
1
BNR2REP3RDM4PROG
Knob (CS EJ)
(K24-3876-04)
Cassette lid
(A53-1703-03)
Knob (1,3,5)
(K25-1462-03)
DOLBY B NR
Knob (2,4,6)
(K25-1463-03)
Blind plate
(F19-1357-04)
NEWS
T/B
5
Knob (NEWS)
(K24-3877-04)
Knob (T/B)
(K24-3878-04)
COMPACT
DIGITAL AUDIO
REG
TONE/
BAL
Knob (VOL)
(K23-1066-04)
Panel assy
(A64-2724-02)
VOL ADJ
T.I
CD
BAND
TAPE
PUSH
POWER
VOLUME
BRIGHT
Cord with plug
(E30-6075-05)
Holder
(J19-5161-05) x 2
GX -401EF2
BLOCK DIAGRAM
ANT.
IC13
CD
MECHA
(X25)
B/2
CASSETTE
MECHA
A11
TUNER
PACK
RDS
IC21
SW-AMP
IC1
EQ,
DOLBY
IC2
MOTOR
DRIVER
IC22
(X25)
A/2
ED1
CD-CH
MPX
E-VOL
IC1
VFD
IC31,32
FIX-EQ
IC84
MEMORY
IC81
SYSTEM u-COM
PANEL u-COM
KEY
MATRIX
MUTE
IC41
POWER
AMP
LAMP
IC82
RESET
Q101
FM+B
SW
Q103
AM+B
SW
Q94
P-ANT
Q709
BU-DET
Q904
ACC-DET
Q706
BU5V AVR
Q708
PON5V SW
Q704
A8V AVR
Q701
CD7V AVR
Q710
C5V AVR
Q605,606
LAMP AVR
A61
DC/DC
(X14)
SP-OUT
P-ANT
BU
ACC
TEL-MUTE
SMALL
L12
DME
CD-MECHA
CME
CASSETTEMECHA
J1
CD-CH
A11ANT
TUNER
FM
AM
CD : 1200mV
TAPE : 540mV
CD-CH : 1200mV
IC21
SWAMP
FM : 220mV
AM : 150mV
IC22
0dB
CD
TAPE
CH
FM
AM
MPX,LOUD,
E-VOL,
BASS,TRE,
FAD,BAL
: +7dB
: +15dB
: +7dB
: +15dB
: +14dB
Level difference of
each source
AM
1kHz 30% mod.
FM
1kHz 40kHz dev.
CD
CH
IC31,32
FIX EQ
-11dB
-19dB
1kHz 0dB
1kHz 0dB
1kHz 0dB 0dB
TAPE
-9.7dB
-5.7dB
IC41
POWER
AMP
+34dB
+34dB
-14dB
0dB
FRONT
SP
REAR
SP
2
GX-401EF2
COMPONENTS DESCRIPTION
● Synthesizer Unit (X14-6212-71)
Ref.No Application / Function Operation / Condition
IC1 Dolby B / Tape EQ amplifier Playback EQ / Dolby B / between music detection
IC2 Motor driver For cassette mechanism
IC12 Ope-amplifier RDS noise amplifier
IC13 RDS decoder RDS decode
IC21 Switch / Ope-amplifier CD/TAPE switch
IC22 Electronic volume BASS/TRE/MPX/EV
IC31,32 Ope-amplifier FIX-EQ
IC41 Power amplifier 4 channel/35W power amplifier
IC71 AVR control AUDIO+8V power supply
IC72 Ope-amplifier 1/2VCC output
IC81 System computer System control
IC82 Reset IC Reset detection
IC84 EEP-ROM Memory backup
Q1 Cassette mechanism main motor power switch Cassette mechanism main motor
Q2 Cassette mechanism main motor power switch Pch-SW
Q3 Gain switching when tape selected music Pch-SW, ON when playback a tape
Q94 P-ANT circuit control switch P-ANT circuit control
Q101 FM power switch FM 8V
Q102 FM power switch Pch-SW
Q103 AM power switch AM 8V
Q104 AM power switch Pch-SW
Q107 IF mode switch by force Output “Lo” when WIDE
Q108 Noise amplifier Noise detection ouput buffer
Q109,110 Noise amplifier Noise detection time constant switching
Q201 Switch for source Output “Lo” when TAPE
Q202 MUTE switch CD mute
Q203 MUTE switch ICll3 hard mute
Q204 MUTE switch CD mute (Rch)
Q205 MUTE switch CD mute (Lch)
Q601 AVR switch for DC/DC Pch-SW
Q603 AVR for DC/DC 13V AVR
Q604 AVR control for DC/DC 13V AVR
Q605,606 AVR for lamp 9V AVR
Q607 AVR switch for lamp Nch-SW
Q608 AVR control for lamp 9V AVR
Q609 SMALL detection Output “Lo” when SMALL ON
Q701 AVR for CD mechanism 7V AVR
Q702 AVR control for CD mechanism 7V AVR
Q703 AVR switch for CD mechanism 7V AVR
Q704 AVR 8V AVR
Q705 AVR switch 8V AVR
3
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