KENWOOD GX-608EF2 Service Manual

CD CASSETTE RECEIVER

GX-608EF2

SERVICE MANUAL

SUBAR U GENUINE

Panel assy (A64-2014-22)

POWER

TUNE/TRACK

REW

LOUD

MUTE

TONE/BAL

VOLUME

B NR REP RDM PROG

Front glass assy (B10-3165-13)

DOLBY B NR

AUTO-REVERSE

COMPACT

DIGITAL AUDIO

B51-7638-00(S) 1889

BAND

TAPE

CHR

VOL ADJ REG

T. I NEWS

AME LOCAL

SCN DISP

RELEASE

Cassette lid (A53-1679-03)

A19

Sub panel assy (A22-2807-13)

Cord with connector (Tel mute) (E30-4810-05)

TEL MUTE

Cord with plug (ANT) (E30-4809-15)

GX-608EF2

ANT

A11 Q101

F/E

IF/NC

PLL

IC22

E-VOL

MPX

SELECTOR

FADER

ISO-AMP

IC21

SW AMP

IC1 (D40-1079-05)

EQ,DOLBY

LOUD

BASS

TREBLE

ATT

IC84

EEPROM

(X92-3590-01)

CD MECHA

CASSETTE

MECHA

MOTOR DRIVER

FM+B

Q103

AM+B

IC13

RDS

IC12

NOISE AMP

CHANGER

IC81

BLOCK DIAGRAM

IC31,32

FIX-EQ

IC83

SYSTEM u-COM

(X25) IC1

PANEL u-COM

VFD KEY MATRIX

IC41

POWER IC

MUTE Dr

Q904

ACC DET.

Q709

BU DET.

TDF

RST

LAMP

RST

Q94

Q701

Q704

IC72

IC92

MECHA

AVR

A8V AVR

VREF AVR

A61

DC/DC

Q605,606

LAMP

SP-OUT

ACC

P-ANTANT-CON

Q708

PON5V

Q706

BU5V

AVR

BACK UP

SMALL IN TEL MUTE

ANT

L12

CASSETTE

MECHA

EQ-DOLBY

CD-MECHA

CD-CH

F/E

TAPE:345mV

0dB

CD:1200mV

0dB

CH:1200mV

0dB

IC21

SW AMP

BA3129F

0dB

FM:223mV

AM:180mV

IC22

MPX

E-VOL

Level difference of each sauce

AM:

400Hz 30%mod.

FM:

1kHz 40kHzdev.

TAPE:

315Hz 0dB

CD:

1kHz 0dB

CH:

1kHz 0dB

TDA7400D

ATT

IC31,32

FIX EQ

-12dB

IC41

AN7550NZNJM2060M

-12.0dB

-9.0dB

-6.0dB

0.0dB

+34dB

FRONT SP

REAR SP

GX-608EF2

COMPONENT DESCRIPTION

●SYNTHESIZER UNIT(X14-6212-70)

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

IC1 HA12216FP Dolby B IC2 BA6219BFP-Y Motor driver For cassette mechanism IC12 NJM4565M-TE2 Operational amplifier For RDS noise amplifier IC13 TDA7479D RDS decoder For RDS decoding IC21 BA3129F SW operational amplifier For CD/TAPE switching IC22 TDA7400D Electronic control BASS, TRE, MPX, EVOL IC31,32 NJM2060M Operational amplifier For FIX-EQ IC41 AN7550NZ Power amplifier 4-channel 35W power amplifier IC71 M5237ML AVR control For AUDIO +8V power supply IC72 NJM4580MD Operational amplifier 1/2 VCC output IC81 UPD784216GF526 System microprocessor System control IC82 PST9130NR Reset IC Reset detection IC83 TC74HC02AF NOR circuit (4) For hard muting IC84 BR24C01AF EEP-ROM For memory backup Q1 2SB1443 Q2 DTC114EK Q3 DTC144EK Gain switching during tape searching Pch-SW, on during tape playback Q4 DTA144EK Gain switching during tape searching Nch-SW, on during tape playback Q5 DTC144EK Motor driver power switch Pch-SW Q6 DTA114EK Motor driver power switch Nch-SW Q7 2SB1443 Motor driver power supply For cassette mechanism submotor driver Q8 2SC2412K(S) Motor driver power supply control For cassette mechanism submotor driver Q9 DTC144EK Kick switch Q101 2SB1188(Q,R) FM power switch For FM 8V Q102 DTC124EK FM power switch Pch-SW Q103 2SB1188(Q,R) AM power switch For AM 8V Q104 DTC124EK AM power switch Pch-SW Q107 DTC124EK IF mode forced switching switch Lo output at WIDE Q108 2SC2412K(S) Noise amplifier Noise detection output buffer Q109 DTC114TK Noise amplifier Constant switching when noise detected Q110 DTA124EK Noise amplifier Constant switching when noise detected Q201 DTC114EK Source switch switching Lo output at TAPE Q202 2SA1037K Mute switch For CD muting Q203 DTC144EK Mute switch For IC II 3 hard muting Q204 DTC343TK Mute switch For CD muting, Rch Q205 DTC343TK Mute switch For CD muting, Lch Q601 DTC124EK DC/DC AVR switch Pch-SW Q602 DTA124EK DC/DC AVR switch Nch-SW Q603 2SB1184 DC/DC AVR For 13V AR Q604 2SC2412K(S) DC/DC AVR control For 13V AR Q605 2SB1565(E,F) Lamp AVR For 10V AR Q606 2SB1565(E,F) Lamp AVR For 10V AR Q607 DTA124EK Lamp AVR switch Nch-SW Q608 2SC2412K(S) Lamp AVR control For 10V AR Q609 DTC144EK Small detection Lo output at small ON

Cassette mechanism main motor power switch Cassette mechanism main motor power switch

Playback EQ, Dolby B, blank space detection

For cassette mechanism main motor Pch-SW

On for emergency eject when submotor locked

GX-608EF2

COMPONENT DESCRIPTION

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

Q610 DTC114EK Lamp AVR switch P-CH-SW Q701 2SB1565(E,F) CD mechanism AVR For 7.5V AVR Q702 2SC2412K(S) CD mechanism AVR control For 7.5V AVR Q703 DTA124EK CD mechanism AVR switch For 7.5V AVR Q704 2SB1565(E,F) AVR For 8V AVR Q705 DTA124EK AVR switch For 8V AVR Q706 2SB1565(E,F) Microprocessor AVR For 5.6V AVR Q707 2SC2412K(S) Microprocessor AVR control For 5.6V AVR Q708 2SA1037K P-ON 5V switch P-ON 5V SW Q709 2SC2412K(S) BU detection Lo output at BU ON Q802 DTA114EK DSI control Hi output when DSI lit Q803 DTC144EK AVR control switch On when P-ON 5V on Q901 2SA1037K P-ANT circuit protection Antenna short-circuiting protection Q902 DTA124EK P-ANT circuit protection Antenna short-circuiting protection Q903 DTC144EK P-ANT circuit control switch P-ANT circuit control Q94 2SB1443 P-ANT circuit control switch P-ANT circuit control Q904 2SC2412K(S) ACC detection Lo output at ACC ON

●SWITCH UNIT(X25-8502-70)

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

IC1 UPD78011FGC599 Display control microprocessor VFD control, key take in Q1 DTC114EK 5V control Nch-SW Q2 DTA114YK VFD power switch Pch-SW Q3 DTC114YK 5V control VFD protection SW Q4 DTC114EK VFD control VFD control

MICROCOMPUTER'S TERMINAL DESCRIPTION

SYSTEM MICROCOMPUTER : UPD784216GF526 (IC81 : X14-6212-70)

●Terminal Description

Pin Function I/O Description

1 AM+B O AM power output 2 FM+B O FM power output 3 P_MUTE O Power IC mute 4 P_STBY O Power IC standby 5 CD_SW3 I CD mechanism SW3 6 CD_MOTOR O CD mechanism loading motor 7 CD_LO/EJ I/O CD mechanism load/eject control 8 CD_MSTOP O CD mechanism mechanism stop 9 VDD -

10-23 CD_MRST O CD mechanism mechanism reset

11 CD_MUTE_L I Mute request from CD mechanism

(Lch) 12 BEEP O Beep output 13 CD_MDET I CD mechanism detection 14 CD_DATA_P I/O CD mechanism data line 15 CD_CLK O CD mechanism clock line 16 NC 17 CD_MUTE_R I Mute request from CD mechanism

(Rch) 18 NC 19 NC 20 REF_CONT O A/D reference voltage control 21 CH_REQH I Communications request from

CDCH CH 22 TEST 23 TYPE1 I Tuner setting 1 24 TYPE2 I Tuner setting 2 25 CD_SW1 I CD mechanism SW1 26 CD_SW2 I CD mechanism SW2 27 MUTE O Audio mute 28 P_ON O Peripheral power control 29 CH_ON O CDCH control output 30 CH_RST O CDCH reset 31 CH_MUTE I CDCH mute 32 ANT_CON O Antenna control 33 DC/DC O DC/DC 34 PACK_DET I 35 CS_STBY I Cassette mechanism standby

36 M_MOTOR O Cassette mechanism main motor

37 VDD 38 X2 39 X1 40 VSS 41 XT2 42 XT1 43 RESET I 44 BU_DET I BU detection 45 CD_SREQ I CD mechanism SIO

46 ACC_DET I ACC detection 47 ILLM_OUT O Illumination control 48 CH_REQC O Communications request from

49 SC_REQ I

Cassette mechanism back detection

position detection

control

communications request

CDCH CH

Communications request from panel

Pin Function I/O Description

50 R_CLK I RDS CLK 51 AVDD 52 AVREFO 53 SMALL I SMAALL input 54 PHONE I Telephone detection 55 REEL_S I 56 REEL_T I 57 NC 58 NOISE I Noise level 59 SMETER I S-meter level 60 MODE I

61 AVSS 62 SC_CON O Panel control output 63 SC_BUSY I Panel busy input 64 AVREF1 65 CH_DATAC I CDCH SIO input 66 CH_DATAH O CDCH SIO output 67 CH_CLK O CDCH SIO CLK 68 SC_DATA I CDCH SIO input 69 MC_DATA O CDCH SIO output 70 MC_CLK O CDCH SIO CLK 71 MC_REQ O Communications request to panel 72 NC 73 PLL_CE O PLL SIO CE 74 PLL_DATA O PLL SIO output 75 PLL_CLK O PLL S10 CLK 76 DSI O Security LED control 77 TDF I Panel detach detection 78 SUB_P O 79 SUB_M O 80 KICK O Cassette mechanism kick control 81 R_DATA I RDS data 82 QUAL I RDS quality 83 PACK_IN I

84 MUSIC O Cassette mechanism blank space

85 MSGV O

86 F/R O 87 METAL I 88 DOLBY O 89 EQ_MUTE O Cassette mechanism EQ mute 90 NC 91 NC 92 AFC I AFC 93 IF_MODE O K21 IF status detection 94 WIDE O K21 control wide 95 NARROW O 21 control narrow 96 FM_SD I SD 97 SDA_IC2 I/O IC2 SDA 98 SCK_IC2 O IC2 SCK 99 A_SEL O Audio select

100 VSS -

GX-608EF2

Cassette mechanism reel pulse input Cassette mechanism reel pulse input

Cassette mechanism mechanism position mode pulse input

Cassette mechanism submotor control Cassette mechanism submotor control

Cassette mechanism tape insertion detection

detection Gain switching during tape search on Cassette mechanism Cassette mechanism F/R switching Cassette mechanism metal detection Cassette mechanism Dolby switching

GX-608EF2

MICROCOMPUTER'S TERMINAL DESCRIPTION

PANEL MICROCOMPUTER : UPD78011FGC599 (IC1 : X25-8502-70)

●Terminal Description

Pin Function I/O Description

1 SC_BUSY O SYSCON panel busy output

2-8 NC -

9 VSS 10,11 NC 12-14 KR2-KR4 I Key read line 15-18 NC 19-23 KS0-KS4 O Key scan line

24 VSS -

25-33 NC -

34 SC_REQ O Communications request to

SYSCON 35 RESET 36 MC_REQ I Communications request from

SYSCON 37 KR1 I Key read line 38 KR0 I Key read line 39 SC_CON I SYSCON panel control 40 VDD 41 X2 42 X1 43 IC 44 XT2 45 NC 46 AVSS -

47-54 NC -

55 AVDD 56 AVREF 57 VFD_ON O VFD power control 58 VFD_DATA O VFD SIO output 59 VFD_CLK O VFD SIOclock 60 VFD_LAT O VFD SIO latch 61 VFD_BLK O VFD blanking 62 MC_DATA I SYSCON SIO input 63 SC_DATA O SYSCON SIO output 64 MC_CLK I SYSCON SIO clock

GX-608EF2

MICROCOMPUTER'S TERMINAL DESCRIPTION

MECHANISM MICROCOMPUTER : MN662770KA7 (IC2 : X32-4600-00)

●Terminal Description

Pin Function I/O Description Processing Operation

1 BDO I Dropout signal input H: detected (Photodetector signal input 1) 2 OFT I Off track signal input H: detected (Photodetector signal input 2) 3 /RFDET I RF detection signal input H: detected (Photodetector signal input 3) 4 VDET I Vibration detection signal input H: detected (Photodetector signal input 4) 5 LDON O Laser on signal output H: ON (Photodetector RF signal adding input) 6 NC - No connection (RF amplifier filter terminal 1) 7 NC - No connection (RF amplifier filter terminal 2) 8 AVSS3 I Analog circuit GND

9 AVDD3 I Analog circuit power supply 10 FBAL O Focus balance adjustment output Laser diode monitor input 11 TBAL O Tracking balance adjustment output Laser diode drive output 12 FE I Focus error signal input (DA input) 13 NC - No connection (Tracking filter filter terminal 1) 14 NC - No connection (Tracking filter filter terminal 1) 15 TE I Tracking error signal input (analog input) 16 NC - No connection (Track cross comparator filter terminal) 17 NC - No connection 18 NC - No connection RF signal input (for RF detection) 19 RFENV I RF envelop signal input 20 VREF I VREF input terminal 21 ARF I RF signal input (for DSL) 22 DRF I DSL bias terminal 23 DSLF I/O DSL loop filter terminal 24 IREF I Reference voltage input terminal 25 PLLF I/O PLL loop filter terminal 26 PLFF2 I/O PLL loop filter properties switching terminal 27 VCOF I/O VCO loop filter terminal 28 VCOF2 I/O Digital servo 33.8688 MHz generating

VCO loop filter terminal 29 TRV O Traverse forced feeding output 30 TVD O Traverse drive output 31 PC O Spindle motor on detection L: ON 32 ECM O Spindle motor drive output (forced mode output)

(DA output) 33 ECS O Spindle motor drive output

(Servo error signal output) 34 KICK O Kick pulse output 35 TRD O Tracking drive output 36 FOD O Focus drive output 37 TOFS O Tracking offset adjustment output 38 AVDD2 I Analog circuit power supply

(for DSL, PLL, AD and DA sections) 39 AVSS2 I Analog circuit GND

(for DSL, PLL, AD and DA sections) 40 DVSS2 I Digital circuit GND 41 EFM or CK384 O EFM signal output Default : EFM signal output

When command executed : 16.9344 MHz clock output

42 PCK or DSLB O PLL sampling clock output Default : PLL sampling clock output

When command executed : DSL balance output 43 /CLDCK O Subcode frame clock signal output 44 FCLK O Crystal frame clock signal output 45 IPFLAG O Interpolation flag signal output H: interpolation 46 FLAG O Flag signal output 47 TRCRS O Track cross signal input (Track cross signal output)

GX-608EF2

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin Function I/O Description Processing Operation

48 STOUT O Monitor signal serial data output

(OFT, VDET, BDO, RFDET, etc.) 49 STLD O Monitor signal load signal output 50 SMCK O Monitor signal bit lock signal output 51 CSEL I Crystal oscillator frequency setting terminal L: locked

52 TEST1 I Test terminal 1 L: locked (normal) 53 TEST2 I Test terminal 2 L: locked (normal) 54 IOSEL I Audio DAC external data input mode setting

terminal 55 /NRST I Reset input L: reset 56 BCLK O SRDATA bit clock output 57 LRCK O L/R identification signal output 58 SRDATA O Serial data output 59 SUBC O Subcode serial output 60 SBCK I Subcode serial output clock input 61 DQSY O CD-TEXT read enable signal output 62 DEMPH O Deemphasis detection signal input L: ON 63 TX O Digital audio interface signal output 64 SRDATAIN I SRDATA input/test terminal 65 LRCKIN I LRCK input/SMCK output frequency switching 66 BCLKIN I BCLK input When not used: VDD 67 DVDD1 I Digital circuit power supply 68 X1 I Crystal oscillator circuit input terminal 69 X2 O Crystal oscillator circuit output terminal 70 DVSS1 I Digital circuit GND 71 XSUB1 I Microprocessor clock input terminal 72 XSUB2 O Microprocessor clock output terminal 73 DVDD2 I Digital circuit power supply

74-78 NC O No connection

79 CLVS O 80 TEST I Test mode switching terminal 81 ASEL I Audio output polarity detection terminal 82 PON O Audio and digital power supply control terminal 83 SEARCH O Servo IC gain switching control terminal 84 VER/HOR O Vertical/horizontal installation switching monitor

85 SW3 I Limit switch detection terminal 86 /MUTE_L O Lch analog mute control terminal 87 /MUTE_R O Rch analog mute control terminal 88 CD_R O CD-R control terminal 89 /RST I System reset input terminal 90 NC I No connection 91 /MSTOP I Standby detection terminal 92 NC O No connection 93 DATA I/O 12C bus data line

94 /CLK I/O 12C bus clock line

95 HOT I Temperature protection detection terminal 96 VREF+ I A/D converter power supply 97 OUTR O Rch audio output 98 AVDD1 I Analog circuit power supply

99 OUTL O Lch audio output

100 AVSS1 I Analog circuit GND

Spindle servo phase synchronization signal output

terminal

(communications line with system microprocessor)

(for audio output section (both Lch and Rch))

H: 33.8688 MHz L: 16.9344 MHz

H = CLV L = rough servo

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