Kenwood GX-SEF2, GX-LEF2, GX-REF2 Service Manual

6CD/CASSETTE & HEATER CONTROL RECEIVER

GX -201 KEF2/LEF2

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/REF2/SEF2

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SERVICE MANUAL (TENTATIVE

SUBARU GENUINE

TEL [phone] QQ 376315150 892498299

GX-201LEF2

COMPACT

DIGITALAUDIO

VOL ADJ

DOLBY B NR

TUNE

TRACK

REG

B NR

Model Model Name Parts No. Destination
GX-201LE GX-201LEF2 86201AG410 Europe (left-hand-drive cars)
GX-201RE GX-201REF2 86201AG310 Europe (right-hand-drive cars)
GX-201KE GX-201KEF2 86201AG210 Other Areas (right-hand-drive cars)
GX-201SE GX-201SEF2 86201AG510 Other Areas (left-hand-drive cars)

Panel assy
( - )*

LOAD

CD

CHR BAND

TAPE

LOCAL

DX

SCAN

RDM

GX-201REF2

8

CD

CHR BAND

TAPE

9

)

COMPACT

DIGITALAUDIO

LOAD

LOCAL

4

2

© 2003-8 CREATED IN JAPAN
B53-0087-00 (N) 0

SCAN

RDM

DX

B NR

ANTI-THEFT SYSETM

9

DOLBY B NR

8

2

9

Panel assy
( - )*

REG

TUNE

TRACK

9

TEL [phone] QQ 376315150 892498299

VOL ADJ

TEL

GX-201SEF2

SCAN

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13942296513

MODE

A/COFF

Panel assy
( - )*

COMPACT

DIGITALAUDIO

DOLBY B NR

TUNE

TRACK

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B NR

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.
The 6CD mechanism has not supplied repair parts for each part (for Optical Laser pickup, motor etc).

.

If you need repair to the 6CD mechanism please change to mechanism assy (D40-1170-15).

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

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LOAD

CHR BAND

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CD

TAPE

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GX-201KEF2

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CD

CHR BAND

TAPE

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DIGITALAUDIO

LOAD

COMPACT

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MODE

B NR

MODE

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A/C OFF

DOLBY B NR

A/C OFF

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Panel assy
( - )*

TUNE

TRACK

SCAN

GX-201KEF2/LEF2/REF2/SEF2

CAUTION ON TRANSPORTING

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When transporting the unit, 6CD-CH mechanism must be

put into the transport mode.

■ How to Achieve the Transport Mode

In order to achieve the transport mode, there should be no
disk and the mechanism nor should the mechanism be in the
waiting mode for disk loading.*

After displaying [NO DISC], turned off the ACC power source.
Keep the BU power source on.

TEL [phone] QQ 376315150 892498299

* Non-waiting mode for disk loading

•Non-waiting mode for disk loading means the state where

the mechanism is displaying [NO DISC] and where the
mechanism shutter is closed.

•In other words, [NO DISC] is displayed 15 seconds after

the disk is taken out or when the shutter of the mechanism
is closed and [LOAD] key is pressed. (Pressing the [LOAD]
key causes the mechanism to enter the waiting and non­waiting mode alternatively.)

• Pressing other source keys after taking all the disks out,

the mechanism shutter closes and it goes into non waiting
mode for disk loading. (At this point the display will indicate
the source selected and does not display [NO DISC].)

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2. Center Scre w condition (By the e xternal view of the mecha­nism, it is possible to make judgment on this by the PLATE­RACK pin position.)

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PLATE-RACK PIN

Fig. 3 Transport mode

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■ Transport Mode Condition

1. Rear Arm condition (This can be confirmed in the condition
where the mechanism cover is in place.)

REAR ARM

Fig. 1 Transport mode

PLATE-RACK PIN

Fig. 4 Up/Down center screw connection condition

■

The Reason to Put the Mechanism in the T ransport Mode

1. Protection of Rear Arm
Putting the mechanism into the transport mode is a protec­tion against the Rear Arm to get deformed from the vibra­tion during transport or sudden fall. Deformity in the Rear
Arm may result in loss of strength for holding the disk in
place.

2. Protection against error at the time of initial search
Putting the mechanism into the transport mode is also a
protection against an error or mechanism lock when the
power is put on again. When the back up is turned off , plate­rack pin could move from the vibration during transport or
sudden fall.
This would cause the system to go into an error detection
of the center screw is not in connection although, in fact, it
is in connected condition.

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Fig. 2 Waiting mode for disk loading

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GX-201KEF2/LEF2/REF2/SEF2

BLOCK DIAGRAM

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(X14- ) (X89-254)

TEL [phone] QQ 376315150 892498299

3

W1

FM/AM
ANT

A3 IC12

(2-71,

2-72)

ONLY

IC13,

FA/AM TUNER
(FRONT END)

IC2114

RDS MUTE

AM

FM

SELECTOR

(X25-929)

6

(X87-3052-70)

1

3

AM NOISE
CANCELLER

IC22

E-VOL/
SIGNAL
PROCESSOR IC

6CD MECHA

DOLBY (IC1)

CASSETTE
MECHA

5

1

5

6CD SERVO
AVR AVR

CASSETTE BU5V, AUDIO8V,

DC/DC
AVR

A1 A2

DC/DC
AUDIO HEAT CONTROL

IC23

FRONT

NAVI
SW

REAR

X81

OSC

12.582MHz

0

IC11IC21IC31

LED10V AVR

X25

DC/DC
AVR

DC/DC

IC81

AVR AVR

IC31-34Q401,402

FIX-EQ

SYSTEM u-COM

IC82

RESET BUS I/F

BUZZER

FM 8VAM 8V

BZ81

8

SW
5V

IC41

POWER
AMP

9

Q813Q102Q104Q605Q602

IC83

2

Q808

IGN
DET

4

9

Q815

BU DET

Q807

ACC DET

Q802,823,824

ILLM +/­DET

Q816

P-ANT

2

8

J1

IGN

AIR-CONDITIONER
UART
COMMUNICATION

J1

BUS
(COMMUNICATION)

BUS
(AUDIO)

J2

9

BU

ACC

ILLM +/-

P-ANT

SP

9

TEL [phone] QQ 376315150 892498299

TEL

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13942296513

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X89

LED
ILLUMINATION FL DISPLAY

ANT

TUNER

CASSETTE-MECHA

CS : DOLBY LEVEL300mV-rms

6CD-MECHA

CD : 1.2V-rms

EXT-UNIT

CH : 1.2V-rms

NAVI

.

NAVI : 1.2V-rms

GX-201KEF2
GX-201REF2/LEF2

FM

AM : 215mV-rms

AM

IC24

ISO

-1dB

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AUDIO KEY

500mV-rms
270mV-rms

IC12

AM/NC

0dB

SELE­CTOR

0dB

0dB

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MATRIX I/F

PANEL
u-COM

FL DISPLAY

LEVEL DIAGRAM

FM

LEVEL DIFFERENCE OF EACH SAUCE

-1.5dB

-23.8dB

3

(CH 1W OUTPUT)

6CD

GX-201KEF2 GX-201REF2/LEF2

1kHz 30% mod.

AM

1kHz 75kHz dev.

FM

315kHz 0dB

CS

1kHz 0dB
1kHz 0dB

CH

Q401,

402

MUTE

-0.5dB

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-7.5dB

LPF

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

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GX-201KEF2

CD : +6dB
CS : +8dB

: +5dBCH

FM : +7dB

: +16dBAM

FAD,
BAL

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FRONT

REAR

1

GX-201REF2

GX-201LEF2

: +6dB

CD

: +8dB

CS

: +5dB

CH

: +10.5dB

FM

: +18dB

AM

IC23IC22IC21

SELECTOR

6

1

UARTHEAT CONTROL

5

Q24,

25ED2 or ED3IC1ED1

-16.5dB

IC31-34

FIX-EQ

+7.7dB

-2.5dB

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-18dB

-6dB

-1dB
0dB

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1kHz 30% mod.
1kHz 40kHz dev.
315kHz 0dB
1kHz 0dB
1kHz 0dB

IC41

AMP

+26dB

+26dB

2

4

-16.5dB

FRONT
SP

REAR
SP

9

-16dB

-8dB

-1dB
0dB

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GX-201KEF2/LEF2/REF2/SEF2

COMPONENTS DESCRIPTION

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● SYNTHESIZER UNIT (X14-694x-xx)

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

IC1 Cassette mechanism sub-motor IC Cassette sub-motor power supply
IC11 FM diversity IC FM diversity switching (Only for GX-201KEF2)
IC12 AM noise canceller IC AM noise canceller
IC13 2-piece ope-amp RDS noise amp (Only for GX-201LEF2/REF2)
IC14 RDS demodulation IC RDS demodulation (Only for GX-201LEF2/REF2)
IC21 Ope-amp with switch CD/Cassette switching

TEL [phone] QQ 376315150 892498299

IC22 Electronic volume BASS/MID/TRE, MPX, Mute, Electronic volume
IC23 Ope-amp with switch Audio/NAVI switching
IC24 2-piece ope-amp CD isolation amp, LPF
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

TEL

IC86,87 Inverter circuit F-BUS control
Q1,2
Q101 Diversity switch When turned ON, turns diversity OFF (Only for GX-201KEF2)
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-201LEF2/REF2)
Q108 S-meter buffer S-meter voltage output
Q151,152 Noise amp Noise detection constant switching (Only for GX-201LEF2/REF2)
Q153 Noise amp Noise detection output buffer (Only for GX-201LEF2/REF2)
Q202 Mute switch For muting within 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

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Cassette mechanism main motor power supply switch

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For cassette mechanism main motor

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GX-201KEF2/LEF2/REF2/SEF2

COMPONENTS DESCRIPTION

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TEL [phone] QQ 376315150 892498299

TEL

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

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
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

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● 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

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GX-201KEF2/LEF2/REF2/SEF2

COMPONENTS DESCRIPTION

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

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

TEL [phone] QQ 376315150 892498299

● DOLBY NOISE REDUCTION UNIT (X87-3052-70)

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

IC1 Dolby NR Dolby BNR, Cassette EQ, Music sensor
Q1 Music sensor level switching Gain switching of dolby IC

● DAUGHTER UNIT (X89-2542-71)

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

IC11 Various constant voltage power supply output 5V, 8V, 10V constant voltage power supply

TEL

IC21 CAS servo 8V power supply For CAS servo
IC31 CD servo 8V power supply For CD servo
Q101 Panel illumination power supply switch When illumination + input, 5V output
Q201~203 CAS servo power supply switch For CAS servo
Q301~303 CD servo power supply switch For CD servo

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GX-201KEF2/LEF2/REF2/SEF2

MICROCOMPUTER’S TERMINAL DESCRIPTION

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● SYSTEM MICROCONTROLLER IC : 703037AGF-A15 (X14 : IC81)

Pin No. Pin Name I/O Application Processing Operation Description

TEL [phone] QQ 376315150 892498299

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1 SC_DATAIN O Slave data output (Panel communication) (UART) 19200bps
2PLL_SDA I/O F/E (+EEPROM) data input/output (I2C) 100kHz or less
3 R_DATA (NC) I (O) RDS data input (M, General type : Open, not used)
4 PLL_SCL O F/E (+EEPROM) clock output (I2C) 100kHz or less
5 R_QUAL (NC) I (O) RDS quality (M, General type : Open, not used)
6 CDX_SI I 6CD data input (SIO) 250kHz
7 CDX_SO O 6CD data output (SIO) 250kHz
8 CDX_CLK I 6CD clock input (SIO) 250kHz

9 EVDD - 5V electrical potential
10 EVSS - GND electrical potential
11 BEEP O BEEP output Buzzer : H (pulse) 2kHz
12 IFC I F/E IFC OUT input Station found : L, Other : H
13 AM+B O AM power supply output AM : H, Other : L

14 FM+B O FM power supply output

15 ILL_DET- I
16 ILL_DET+ I ILL+ detection (Vehicle small signal) ILL+ ON : L

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17 NC O Not used Open
18 MUSIC I CS between music detection Between music : H, Music detection : L
19 DOLBY O CS dolby switching NR ON : H, NR OFF : L
20 EQ_MUTE O CS EQ mute PLAY : L, FF/REW DPSS : H
21 IC/VPP - Write voltage
22 CDX_MTS O 6CD communication request output
23 MTL I CS metal SW Normal : H, Metal, CrO2 : L
24 F/R O CS F/R switching FWD : L, REV : H, Initial : L
25 MSC O CS gain switching at music select G1 (-40dBm) : L, G2 (-60dBm) : H
26 BUS_DI I IE-BUS data input
27 BUS_DO O IE-BUS data output
28 IC2_SDA I/O IC2 data input/output (I2C) 100kHz or less
29 IC2_SCL O IC2 clock output (I2C) 100kHz or less
30 NC O Not used Open
31 A_SEL O Audio selection CD : H, CS : L
32 MUTE O Audio mute Mute : H, Normal : L

33 AFS (NC) O

34 RESET I System reset input Reset : L, Reset voltage : 4.2V, Reset at rise of L→H
35 XT1 I Sub-system clock oscillation terminal

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ILL- detection (

Switching constant at noise detection

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Vehicle

illumination control signal)

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RDS operation : H (FM : H),
Other than RDS operation : L (Other : L)
ILL- ON (GND) : H (Pulse input)

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FM, AM seek : L (J, M, General type : Open, not used),
RDS operation : H, Other than RDS operation : L

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GX-201KEF2/LEF2/REF2/SEF2

MICROCOMPUTER’S TERMINAL DESCRIPTION

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Pin No. Pin Name I/O Application Processing Operation Description

36 XT2 - Sub-system clock oscillation terminal
37 REGC ­38 X2 - Main system clock oscillation terminal 12.58MHz
39 X1 I Main system clock oscillation terminal 12.58MHz
40 VSS - GND electrical potential
41 VDD - 5V electrical potential
42 NC O Not used Open

TEL [phone] QQ 376315150 892498299

43 HARD_RESET O Hard reset output Reset : H
44 NAVI_SW O NAVI voice switching NAVI interruption : H, Normal : L
45 NAVI_MUTE O

46 DC/DC_FREQ O DC/DC oscillation frequency control AM 5kHz step 750~900, 1110~1270, 1480~1630 : Hi,

47 NC (DIVER) O Not used (Diversity antenna control) M type : Test mode : H (OFF) or L (ON) switching

48 P_STBY O Power IC standby control ACC ON, POWER ON : H, Other : L

TEL

49 P_MUTE O Power IC mute control This mute should not be normally used when playing

50 SVR O SVR control Normal : L, Discharge : H

51 ANT_CON O Power antenna control

52 NC O Not used Open
53 IGN_DET I IGN detection IGN ON : L, IGN OFF : H, Detection voltage : 8V
54 ON_REQ I F-BUS ON request System ON request : L
55 SYS_ON O F-BUS ON output System ON : H
56 CDX_STM I 6CD communication request input Communication request : L
57 SYS_OFF O F-BUS OFF output System OFF : H
58 BVDD - 5V electrical potential
59 BVSS - GND electrical potential
60 BUS_STBY O BUS IC standby control System ON : H
61 PON O Power ON control

62 DC/DC_H O DC/DC (For of HTR-VFD) control

63 DC/DC_A O DC/DC (For AUDIO-VFD) control

64 MOTOR O CS main motor control Main motor ON : H

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NAVI voice Frontch interruption mute (When switching)

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NAVI interruption start/release : L, Normal : H
AM 9kHz step 747~900, 1125~1287, 1494~1629 : Hi,

Other : L
E, General type : Open, not used

(Initial : H), Normal mode : L (DIVER ON)

Mute : L, Other : H

5

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is broken off such as search during play.

Tuner ON : H, RDS operation during other sources : H,
Other : L

Power ON : L, Power OFF : H, Stabilization time 400ms
HTR ON : H, HTR OFF : L, Stabilization time 550ms,
Turn to H after receiving panel µ-com HVFD_ON : H
AUDIO ON : H, AUDIO OFF : L, Stabilization time 500ms,
Turn to H after receiving panel µ-com AVFD_ON : H

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GX-201KEF2/LEF2/REF2/SEF2

MICROCOMPUTER’S TERMINAL DESCRIPTION

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Pin No. Pin Name I/O Application Processing Operation Description

TEL [phone] QQ 376315150 892498299

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65 SUB+ O CS sub-motor control
66 SUB- O CS sub-motor control
67 MODE3 I CS FF/REW/FWD/REV detection
68 MODE1 I CS FF/REW/FWD/REV detection
69 MODE2 I CS FF/REW/FWD/REV detection
70 CDX_ACC O 6CD ACC Operating 6CD : L, Other : H
71 CDX_RST O 6CD reset Reset : L, Normal : H
72 CDX_EJEREQ O Eject request Eject : L
73 REF_CON O A/D port reference voltage output ACC ON : H, Other : L
74 AVDD - 5V electrical potential
75 AVSS - GND electrical potential
76 AVREF I A/D port reference voltage input
77 CDX_DDCNT I 6CD servo control 6CD ON : H
78 CDX_MUTE I 6CD mute request Mute : L
79 RREEL I CS reel pulse (AD input) CS reverse rotation side reel photo input
80 FREEL I CS reel pulse (AD input) CS foreword rotation side reel photo input
81 DIAG I Test mode terminal Test mode : L, Normal : H
82 TYPE1 I Destination setting 1

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83 TYPE2 I Destination setting 2
84 TYPE3 I Destination setting 3
85 NOISE I FM noise detection (AD input)
86 SMETER I S-meter (AD input)
87 NC I Not used
88 SCRTY I Forced security release Release : L, Other : H
89 SC_CON O Slave ON/OFF control (Panel communication) ON : H, OFF : L
90 MC_REQ I Master ON request (Panel communication) ON request : H
91 ACC_DET I ACC detection ACC ON : L, ACC OFF : H, Detection voltage : 8.5V
92 OFF_REQ I F-BUS OFF request System OFF request : L

93 BU_DET I BU detection

94 SC_RST O Slave reset (Panel communication)

95 SC_BKUP O
96 R_CLK (NC) I (O) RDS clock M, General type : Open, not used
97 FLASH_SI O Not used Open (For flash writing)
98 FLASH_SO O Not used Open (For flash writing)
99 FLASH_CLK O Not used Open (For flash writing)

100 MC_DATAIN I Slave data input (Panel communication) (UART) 19200bps

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Reduced electricity detection (Panel communication)

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NOISE value : With 2.9V or less, station found permission
SMETER value : According to the data written in EEPROM

BU ON : L, BU OFF (At instant reduction) : H,
Detection voltage : 8.5V
Normal : H, Reset : L (2 pulses),
Immediately after reset, communication error : Reset
Electricity reduced product : L, Normal : H

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GX-201KEF2/LEF2/REF2/SEF2

MICROCOMPUTER’S TERMINAL DESCRIPTION

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● PANEL MICROCONTROLLER : 90587CAPFV13x (X25 : IC1)

Pin No. Pin Name I/O Application Processing Operation Description

1 KR2_A I Key matrix (RET : 2Bit)
2 KR3_A I Key matrix (RET : 3Bit)
3 KR4_A I Key matrix (RET : 4Bit)
4 KR5_H I Key matrix (RET : 5Bit)
5 KR6_H I Key matrix (RET : 6Bit)
6,7 NC O Not used, Open

TEL [phone] QQ 376315150 892498299

8AVFD_ON O Audio VFD power supply ON signal When stopped (L) : Power supply OFF,

9 VSS - Within-chip ground GND
10~15 NC O Not used, Open
16 HMC_DATA I Heater ECU communication (Reception) Conducts communication (Reception) with A/C
17 HSC_DATA O Heater ECU communication (Transmission) Conducts communication with A/C (transmission)
18,19 NC O Not used, Open
20 AVFD_DATA O
21 VCC - Power supply input terminal BU5V connection
22 AVFD_CLK O VFD tube communication for audio (Clock)

TEL

23 SCL O Serial clock for E2PROM Output to E2PROM as I2C clock signal
24 SDA I/O Serial data for E2PRROM Input/Output to E2PROM as I2C data signal
25 C - Terminal for voltage stabilization 0.1µF capacitor connection
26 TYPE1 I Left/Right steering wheel judgment H : Left steering wheel, L : Right steering wheel
27 TYPE2 I Judgment on security condition H : Security, L : No security
28 DVRH - Connected to GND as D/A converter not used GND
29 DVSS - Ground the terminal for D/A converter GND
30,31 NC O Not used, Open
32 AVCC - Power supply input terminal A/D converter VCC
33 AVRH - Connected to GND as A/D converter not used GND
34 AVRL - Connected to GND as A/D converter not used GND
35 AVSS - Ground the terminal for A/D converter GND
36 NC O Not used, Open
37 HVFD_DATA O

38 HVFD_CLK O Heater VFD tube communication (Clock)

39 NC O Not used, Open
40 VSS - GND connection terminal GND
41 ACC_DET I Detection of ACC Hi : No ACC, Lo : With ACC

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42 SW5V_ON O UART buffer power supply control

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VFD tube communication for audio (Transmission)

Heater VFD tube communication (Transmission)

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Controls power supply for Audio FL tube.

Normal operation (H) : Power supply ON

Display data transmission for audio FL tube

Audio VFD synchronization clock output during serial communication

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Display data transmission to A/C FL tube
Heater VFD tube communication synchronization clock
output for serial communication

When IGN ON L : ON (SW5V) output,

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When IGN OFF H : OFF (SW5V) output

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GX-201KEF2/LEF2/REF2/SEF2

MICROCOMPUTER’S TERMINAL DESCRIPTION

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Pin No. Pin Name I/O Application Processing Operation Description

TEL [phone] QQ 376315150 892498299

TEL

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43,44 NC O Not used, Open

45 IGN_DET I External interruption 0 (IGN signal)

46 SC_BKUP I

47 MD0 I Used when writing to flash ROM Hi : Normal mode, Lo : FLASH writing mode
48 MD1 I Used when writing to flash ROM Hi : Normal and FLASH writing mode, Lo : No setting
49 MD2 I Used when writing to flash ROM Hi : FLASH writing mode, Lo : Normal mode
50 HST I L : Hardware standby condition VCC
51,52 NC O Not used, Open

53 SC_CON I External interruption 4 (Audio SC-CON signal) start/stop is made as external interruption from audio.

54 KR0_A I External interruption 5 (Interruption key RET0)

55 KR1_A I External interruption 6 (Interruption key RET1)

56 NC O Not used, Open
57 SC_DATA IN I

58 MC_DATA IN O Audio system µ-com communication

59 MC_REQ O Audio MC_REQ signal

60 AVFD_LAT O Audio VFD tube LAT signal Audio FL tube display data LAT signal
61 NC O Not used, Open
62 HVFD_CS O Heater VFD tube chip select signal
63 NC O Not used Pull down (When built-in ROM is flash memory)
64 NC I Not used Pull down (When built-in ROM is flash memory)

65 HVFD_ON O Heater VFD power supply ON signal

66,67 NC O Not used, Open

68 AVFD_BLK O Audio VFD tube brightness adjust Brightness info is variable by the Audio system µ-com with the

69~74 NC O Not used, Open
75 SC_RST I CPU reset signal
76 NC O Not used, Open

13942296513

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Detect IGN signal. Lo : Communication permitted,
Hi : Communication prohibited

As audio communication permission signal, judgment on

Hi : Occurrence of interruption, Lo : Port sampling
Audio key stop mode return.
In stop mode, Lo : Occurrence of interruption, Other : Prohibition
Audio key stop mode return.
In stop mode, Lo : Occurrence of interruption, Other : Prohibition

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Communication interface with Audio system µ-com (Reception).
Reception data is display data.
Communication interface with Audio system µ-com (Transmission).

Beginning communication with Audio
Output stopped after recognizing SC-CON signal.

When chip select (Lo) is output, signal transmission data is effective

Stopped (L) : Power supply OFF,
Normal operation (H) : Power supply ON

Audio FL tube brightness is adjusted with Hi/Lo duty ratio.

illumination brightness data. Duty ratios are of 16 types

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External interruption 1 Breakup condition output from Audio.
(Power supply breakup signal) Hi : Breakup recovery, Lo : Breakup occurrence

Audio system µ-com communication
(Reception)

(Transmission) Trans mission data is key data and CAN data.

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system µ-com

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GX-201KEF2/LEF2/REF2/SEF2

MICROCOMPUTER’S TERMINAL DESCRIPTION

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Pin No. Pin Name I/O Application Processing Operation Description

77 X1A ­78 X0A O
79 VSS - GND connection terminal GND
80 X0 - CPU main clock supply 3.9936MHz crystal is used.
81 X1 - CPU main clock supply 3.9936MHz crystal is used.
82 VCC - Power supply Input terminal Connected to BU5V
83 NC O FLASH write method setting Not used during normal operation, Lo : Serial write permission

TEL [phone] QQ 376315150 892498299

84 NC I FLASH write method setting Not used during normal operation, Hi : Serial write permission
85 F_DEF_DIM O LED control of front DEF key H : Bright light, L : Dim light
86 F_DEF_IND O LED control of front DEF key Lo : ON, Hi : OFF
87 R_DEF_DIM O LED control of rear DEF key H : Bright light, L : Dim light
88 R_DEF_IND O LED control of rear DEF key Lo : ON, Hi : OFF
89 HENC_UP I Rotary encoder SW (A/C : A)
90 HENC_DW I Rotary encoder SW (A/C : B)
91 AENC_UP I Rotary encoder SW (Audio : A)
92 AENC_DW I Rotary encoder SW (Audio : B)
93 KS0_AH O Key matrix (SCAN : 0Bit)
94 KS1_AH O Key matrix (SCAN : 1Bit)

TEL

95 KS2_AH O Key matrix (SCAN : 2Bit)
96 KS3_AH O Key matrix (SCAN : 3Bit)
97 KS4_AH O Key matrix (SCAN : 4Bit)
98 TONE I TONE (BAL/PAD) key input Lo : OFF, Hi : ON
99 A_STORE I A_STORE key input Lo : ON, Hi : OFF
100

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13942296513

DOWN_SEEK

6

Sub clock terminals for accommodating 2 clocks
Sub clock terminals for accommodating 2 clocks

IDOWN_SEEK key input Lo : OFF, Hi : ON

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Not used, Connected to GND

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GX-201KEF2/LEF2/REF2/SEF2

SECURITY CODE (GX-201REF2)

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and GX-201RHF2.

● Security Function

the data from the immobilizer, which is sent from the vehicle,
and the data that are set beforehand.

chart below.

TEL [phone] QQ 376315150 892498299

● Code Confirmation Mode

tered or not in the audio unit.

TEL

rent mode.

• The registration condition of the Security code can be

• The Security code is not registered or when abnormalities

• When registering a Security code, the system will move to

● Non-Registration Mode

the Security code is not registered for an audio unit.

sible for an hour. Howe v er , there is a certain limitations placed
on the operation. Using this time, production and a variation
on the products will be conducted.

● Confirmation Mode

when the Security code is confirmed to be adjusted to in the
Code confirmation mode.

grated ECU on the vehicle side, it goes into the gateway. The

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Immobi code sent to the audio unit by UART and the Security
code registered on the audio unit is compared.

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The audio security system has been set for GX-201REF2

Security is released when an agreement is found between

The interrelationship in the security system is shown in the

Confirmation mode

OK

Normal operation

This mode is for judging whether the Security code is regis-

When the unit is reset, the operation will start from the Cur-

Thus system will move to the Non-registration mode, when

Even if the Security code is not resisted, operation is pos-

The system will automatically go into the Confirmation mode,

When the A/C ECU is obtained Through CAN from the Inte-

13942296513

grasped using the E2PROM.

detected with E2PROM, the system will move to Non-reg­istration mode.

Confirmation mode.

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Code confirmation mode

NG

Security mode

Delete mode

Re-Registration

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Non-registrationRegistration

Non-registration mode

Registration mode

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As a result of confirmation, if the code is judged to be au­thentic, the system goes into normal operation. However, if
the code is not judged to be authentic, then the system goes
into the Security mode.

● Security Mode

The system goes into the Security mode when the Immobi
code is not judged to be authentic when it is compared with
the Security code registered in the audio unit. When this hap­pens, the unit can be operated for an hour. After the elapse of
an hour, the po wer on the unit is cut off and operation is f orce­fully stopped.

Also, in the Non-registration mode, if an hour elapses, the
system will go into the Security mode. In the Security mode,
the power on the unit is cut off and operation is forcefully
stopped.
Note : When working on a unit to repair it, the repair would
should be conducted in the one hour effective time. After the
elapse of an hour, the power on the unit is cut off. If the power
is put on again, another hour will be given to operate on.

• Conditions of the audio unit during the Security mode

Power off.

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Display light off.
Keys do not work (Except the EJECT Key).
Audio power off (No voice output).
Switching on TV sources not possible . ( Key operation from
the monitor not possible.)
Voice interruption/switching from NAVI and hands-free unit
not possible.
In the Security mode, the display is not lighted and when
there is an input from any of the key, “SECURITY” will be
displayed.

● Delete Mode

The system goes in the Delete mode, when the “Request­ing Delete” condition of the Integrated ECU operating condi­tion signal from the Integrated ECU is obtained by the A/C
ECU via low-speed CAN into the gateway and it is sent to the
audio unit via UART.

The Delete mode is positioned as a Test mode and detailed
input methods are not disclosed.

The Security code recorded into the E2PROM in the Regis­tration mode and Re-registration mode is cleared in the De­lete mode and non-registration condition is obtained.
Note : When a linked product is repaired, the security code
must be deleted when the repair work is completed.

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For GX-201, in order to maintain the security, deletion is
only effective when selection monitor is used.

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GX-201KEF2/LEF2/REF2/SEF2

ADJUSTMENT

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No. ITEM

CASSETTE DECK SECTION

[1] AZIMUTH

TEL [phone] QQ 376315150 892498299

[2]

3

PLAY BACK

LEVEL

6

SETTINGS SETTINGS

1

5

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INPUT OUTPUT

TCC-153

10kHz

Connect a AC VR1 (L)

TCC-130 voltmeter to CN2 TAPE PLAY VR2 (R) 300mV

5

0

Connect a

AC voltmeter TAPE PLAY

to SP OUT becomes maximum

(X87) (X87)

TUNER

(RECEIVER)

SETTINGS

8

ALIGNMENT

Head Azimuth

9

POINTS

Screw

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4

9

ALIGN FOR

Adjust the azimuth for each

Lch/Rch or FWD/RVS

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TEL

13942296513

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EDCBA

GX-201KEF2/LEF2/REF2/SEF2

PC BOARD (FOIL SIDE VIEW)

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DOLBY NOISE REDUCTION UNIT X87-3052-70 (J74-1366-12)

TEL [phone] QQ 376315150 892498299

3

C25

C26

R

CN2

6

DOLBY

L

13

W10

W9

C6

R13

EB

Q1

R9

C24

3

C13

C17

VR1

C11

C20

C23

1

CN4

5

C15

R5

C7

C9

W8

R10

W7

1

C27

R11

5

C3

R3

W14

R8

10

11

R4

0

CN3

5

C4

20 21

C32

24

1

C29

IC1

C1
R1C2R2

1

C28

40

30

110

C31

31

W3

8

W1

W5

R7

C30

W6

9

C14

W2
W4

W12

2

W11

R12

C12

4

C5

DOLBY RDOLBY L

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R6

C8

C16

8

VR2

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TEL

13942296513

Refer to the schematic diagram for the values of resistors and capacitors.

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X87-3052-70

Ref No. Address

IC1 3C

Q1 3A

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