Kenwood GX-201KHF2, GX-201LHF2 Service Manual

CD & HEATER CONTROL RECEIVER

GX -201 KHF2/LHF2
/RHF2/SHF2

SERVICE MANUAL (TENTATIVE

SUBARU GENUINE

GX-201LHF2

COMPACT

DIGITALAUDIO

VOL ADJ

REG

TUNE

TRACK

Model Model Name Parts No. Destination
GX-201LH GX-201LHF2 86201AG400 Europe (left-hand-drive cars)
GX-201RH GX-201RHF2 86201AG300 Europe (right-hand-drive cars)
GX-201KH GX-201KHF2 86201AG200 Other Areas (right-hand-drive cars)
GX-201SH GX-201SHF2 86201AG500 Other Areas (left-hand-drive cars)

Panel assy
( - )*

CD

CHR

FM

AM

LOCAL

DX

SCAN

RDM

)

GX-201RHF2

COMPACT

DIGITALAUDIO

CD

CHR FM

AM

LOCAL

DX

SCAN

RDM

© 2003-8 CREATED IN JAPAN
B53-0088-00 (N) 0

Panel assy
( - )*

ANTI-THEFT SYSETM

REG

TUNE

TRACK

VOL ADJ

GX-201SHF2

COMPACT

DIGITALAUDIO

SCAN

TUNE

TRACK

MODE

MODE

A/COFF

A/C OFF

Panel assy
( - )*

GX-201KHF2

COMPACT

DIGITALAUDIO

CD

CHR FM

AM

MODE

A/COFF

* Part number of panel assy is undecided.

The knobs with numbers larger than 700 on exploded view are not supplied for
service parts because it is difficult to apply grease.
Please change to panel assy (PA1) when you need repair to the knob.

DC cord for service : E30-3801-15
Antenna connector replacement cord for service : E30-6255-05

CHR

CD

FM

AM

MODE

A/C OFF

Panel assy
( - )*

TUNE

TRACK

SCAN

GX-201KHF2/LHF2/RHF2/SHF2

BLOCK DIAGRAM

(X14- ) (X89-254)

W1

FM/AM
ANT

AM

FM

CD SERVO
AVR

IC11

FM
DIVERSITY

DC/DC

A3 IC12

14

FA/AM TUNER
(FRONT END)

(2-73,

2-74)

ONLY

IC13,

RDS MUTE

AM NOISE
CANCELLER

IC22

E-VOL/
SIGNAL
PROCESSOR IC

AVR

A1 A2

DC/DC
AUDIO HEAT CONTROL

IC23

FRONT

NAVI
SW

REAR

CD MECHA

X81

OSC

12.582MHz

(X25-929)

DC/DC
AVR

DC/DC

IC81

SYSTEM u-COM

IC82

RESET BUS I/F

IC11IC31

BU5V, AUDIO8V,
LED10V AVR

X25

AVR AVR

IC31-34Q401,402

FIX-EQ

BUZZER

FM 8VAM 8V

BZ81

SW
5V

IC41

POWER
AMP

Q813Q102Q104Q605Q602

IC83

IGN
DET

Q808

J1

IGN

AIR-CONDITIONER
UART
COMMUNICATION

Q815

BU DET

Q807

ACC DET

Q802,850,851

ILLM +/­DET

Q816

P-ANT

J1

BUS
(COMMUNICATION)

BUS
(AUDIO)

J2

BU

ACC

ILLM +/-

P-ANT

SP

X89

LED
ILLUMINATION FL DISPLAY

ANT

TUNER

AM : 215mV-rms

AUDIO KEY

GX-201KHF2/SHF2
GX-201RHF2/LHF2

FM

IC12

AM/NC

AM

0dB

-7.5dB

CD-MECHA

CD : 1.2V-rms

EXT-UNIT

CH : 1.2V-rms

NAVI

NAVI : 1.2V-rms

MATRIX I/F

PANEL
u-COM

FL DISPLAY

LEVEL DIAGRAM

FM

500mV-rms

LPF

MPX,
LOUD,
E-VOL,
BASS,
TRE,
MID

270mV-rms

GX-201KHF2
GX-201SHF2

CD : +5dB

: +5dBCH

FM : +7dB

: +16dBAM

FAD,
BAL

FRONT

REAR

GX-201RHF2
GX-201LHF2

: +5dB

CD

: +5dB

CH

: +10.5dB

FM

: +18dB

AM

IC23IC22

SELECTOR

LEVEL DIFFERENCE OF EACH SAUCE
(CD 1W OUTPUT)

GX-201KHF2/SHF2 GX-201RHF2/LHF2

1kHz 30% mod.

AM

1kHz 75kHz dev.

FM

1kHz 0dB

CD

1kHz 0dB

CH

Q401,

-1.5dB

402

MUTE

-23.8dB

-0.5dB

-16dB

IC31-34

FIX-EQ

+7.5dB

-3dB

Q24,

UARTHEAT CONTROL

1kHz 30% mod.
1kHz 40kHz dev.

-6dB
1kHz 0dB

0dB

1kHz 0dB

0dB

IC41

25ED2IC1ED1

AMP

+26dB

+26dB

-14dB

-8dB
0dB
0dB

FRONT
SP

REAR
SP

2

GX-201KHF2/LHF2/RHF2/SHF2

COMPONENTS DESCRIPTION

● SYNTHESIZER UNIT (X14-694x-xx)

Ref. No. Application / Function Operation / Condition / Compatibility

IC11 FM diversity IC FM diversity switching (Only for GX-201JHF2/KHF2)
IC12 AM noise canceller IC AM noise canceller
IC13 2-piece ope-amp RDS noise amp (Only for GX-201LHF2/RHF2)
IC14 RDS demodulation IC RDS demodulation (Only for GX-201LHF2/RHF2)
IC22 Electronic volume BASS/MID/TRE, MPX, Mute, Electronic volume
IC23 Ope-amp with switch Audio/NAVI switching
IC31~34 4-piece ope-amp FIX-EQ
IC35 2-piece ope-amp 1/2 VCC output
IC41 Power amp 4ch power amp
IC81 System µ-com System control
IC82 Reset IC System reset detection
IC83 I2C BUS IC F-BUS communication
IC84 2-piece NOR circuit For hard muting
IC85 EEPROM Bug counter-measure
IC86,87 Inverter circuit F-BUS control
Q101 Diversity switch When turned ON, turns diversity OFF (Only for GX-201JHF2/KHF2)
Q102,103 FM power supply switch When FM, 8V output
Q104,105 AM power supply switch When AM, 8V output
Q106 IF count detection When detecting IF count, Lo output
Q107 RDS data buffer RDS data buffer output (Only for GX-201LHF2/RHF2)
Q108 S-meter buffer S-meter voltage output
Q151,152 Noise amp Noise detection constant switching (Only for GX-201LHF2/RHF2)
Q153 Noise amp Noise detection output buffer (Only for GX-201LHF2/RHF2)
Q202 Mute switch For muting with in electronic volume
Q401,402 NAVI mute For NAVI muting at interruption
Q403 SVR switch For SVR discharging
Q404 SVR switch For SVR discharging at over voltage
Q601,602 Audio DC/DC power supply switch For DC/DC audio
Q604,605 Heater DC/DC power supply switch For DC/DC heater
Q606,607 DC/DC control switch For switching internal frequency
Q650 Audio DC/DC power supply switch For DC/DC audio
Q651 Heater DC/DC power supply switch For DC/DC heater
Q801 Buzzer switch For buzzer
Q802 Illumination + detection For illumination + detection
Q803 Reset output switch for F-BUS When resetting F-BUS, Hi output
Q804 NAVI mute switch When muting NAVI, Hi output
Q805 IF count detection When detecting IF count, Lo output
Q806 P-ANT circuit control switch When tuner, GND electric potential output
Q807 ACC detection When ACC ON detection, Lo output
Q808 IGN detection When IGN ON detection, Lo output
Q809 SYS_ON current buffer When SYS_ON Hi, Lo output
Q810 Hard reset switch When HARD_RESET ON, Lo output
Q812 BUS_OFF switch When F-BUS system OFF, Hi output

3

GX-201KHF2/LHF2/RHF2/SHF2

COMPONENTS DESCRIPTION

Ref. No. Application / Function Operation / Condition / Compatibility

Q813 P-ON5V power supply switch For P-ON5V
Q815 BU detection When BU ON, Lo output
Q816 P-ANT circuit control switch When tuner, BU electric potential output
Q817,818 P-ANT circuit protection P-ANT short circuit protection
Q820 F-BUS mute output When mute ON, Hi output
Q821 BUS_ON detection When F-BUS system ON, Hi input
Q822 BUS_ON switch When F-BUS system ON, Hi output
Q850,852 Illumination - detection switch When detecting illumination -, Hi output
Q853 Illumination - detection switch When detecting illumination -, Lo output

● SWITCH UNIT (X25-929x-xx)

Ref. No. Application / Function Operation / Condition / Compatibility

IC1 Display control µ-com VFD control, Key intake
IC3 EEPROM For bug counter-measures
Q1 Audio VFD5V switch When audio VFD ON, 5V output
Q2 Audio VFD5V switch When audio DC/DC ON, Lo output
Q4 Heater VFD5V switch When heater VFD ON, 5V output
Q5 Heater VFD5V switch When heater DC/DC ON, Lo output
Q11 F differential indicator power supply switch When F-differential indicator ON, 5V output
Q12 R differential indicator power supply switch When R-differential indicator ON, 5V output
Q21 Multiple-push reset circuit detection When detecting REP/RDM, DWN_SEEK, Hi output
Q22 Multiple-push reset circuit detection When resetting by multiple push, Lo output
Q23 Multiple-push reset circuit detection When TONE (BAL/FAD) detected, Lo output
Q24 Heater UART communication control Heater UART communication control (TX)
Q25 Heater UART communication control Heater UART communication control (RX)
Q26 SW5V power supply switch When IGN ON, 5V output
Q27 Panel illumination switch When panel illumination ON, 10V output
Q28 Panel illumination switch When panel illumination ON, GND electrical potential
Q29 F differential indicator dimmer control When dimmer OFF, GND electrical potential
Q30 R differential indicator dimmer control When dimmer OFF, GND electrical potential
Q33 System reset detection When system is reset, Hi output
Q34 Dimmer current counter-measure When audio encoder ON, 5V output
Q35 System reset detection When system is reset, Lo output
Q36,37 6CD breakup counter-measure FL (H) discharge circuit

● DAUGHTER UNIT (X89-2540-01)

Ref. No. Application / Function Operation / Condition / Compatibility

IC11 Various constant voltage power supply output 5V, 8V, 10V constant voltage power supply
IC31 CD servo 8V power supply For CD servo
Q101 Panel illumination power supply switch When illumination + input, 5V output
Q301~303 CD servo power supply switch For CD servo

4