KENWOOD GX-608EF2 Service Manual

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B51-7638-00(S) 1889

SERVICE MANUAL

CD CASSETTE RECEIVER

GX-608EF2

POWER

TUNE/TRACK

REW

LOUD

MUTE

SCN DISP

T. I NEWS

TONE/BAL

VOLUME

BAND

CHR

TAPE

COMPACT

DIGITAL AUDIO

B NR REP RDM PROG

RELEASE

AUTO-REVERSE

DOLBY B NR

AME LOCAL

VOL ADJ REG

Front glass assy

(B10-3165-13)

Panel assy

(A64-2014-22)

TEL MUTE

A19

SUBAR U GENUINE

Sub panel assy

(A22-2807-13)

Cassette lid

(A53-1679-03)

Cord with plug (ANT)

(E30-4809-15)

Cord with connector

(Tel mute)

(E30-4810-05)

GX-608EF2

BLOCK DIAGRAM

L12

FM:223mV

AM:180mV

TAPE:345mV

CD:1200mV

CH:1200mV

0dB

AM:

FM:

TAPE:

CD:

CH:

-6.0dB

-9.0dB

-12.0dB

0.0dB

315Hz 0dB

1kHz 40kHzdev.

400Hz 30%mod.

1kHz 0dB

F/E

ANT

SW AMP

IC21

EQ-DOLBY

CD-MECHA

CD-CH

IC22

E-VOL

-12dB

IC31,32

FIX EQ

+34dB

IC41

REAR

FRONT

MPX

AN7550NZNJM2060M

ATT

TDA7400D

BA3129F

0dB

CASSETTE

MECHA

ANT

F/E

IF/NC

PLL

FM+B

AM+B

A11 Q101

Q103

RDS

NOISE AMP

IC12

IC13

LOUD

BASS

TREBLE

ATT

FADER

ISO-AMP

SELECTOR

MPX

IC22

E-VOL

SW AMP

EQ,DOLBY

IC21

IC1 (D40-1079-05)

MECHA

(X92-3590-01)

CD MECHA

CASSETTE

FIX-EQ

IC31,32

IC81

EEPROM

IC84

CHANGER

SYSTEM u-COM

DRIVER

MOTOR

POWER IC

IC41

SP-OUT

MUTE Dr

IC83

Q709

BU DET.

Q904

ACC DET.

ACC

P-ANTANT-CON

Q94

PANEL u-COM

IC1

VFD KEY MATRIX

LAMP

(X25)

TDF

RST

IC92

MECHA

Q701

AVR

A8V

AVR

Q704

AVR

VREF

IC72

BU5V

AVR

Q706

BACK UP

Q708

PON5V

LAMP

A61

Q605,606

SMALL IN

TEL MUTE

DC/DC

Level difference of each sauce

GX-608EF2

●SYNTHESIZER UNIT(X14-6212-70)

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

IC1 HA12216FP Dolby B

Playback EQ, Dolby B, blank space detection

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

Cassette mechanism main motor power switch

For cassette mechanism main motor

Q2 DTC114EK

Cassette mechanism main motor power switch

Pch-SW

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

On for emergency eject when submotor locked

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

COMPONENT DESCRIPTION

GX-608EF2

●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

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

GX-608EF2

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

Cassette mechanism back detection

35 CS_STBY I Cassette mechanism standby

position detection

36 M_MOTOR O Cassette mechanism main motor

control

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

communications request

46 ACC_DET I ACC detection

47 ILLM_OUT O Illumination control

48 CH_REQC O Communications request from

CDCH CH

49 SC_REQ I

Communications request from panel

MICROCOMPUTER'S TERMINAL DESCRIPTION

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

Cassette mechanism reel pulse input

56 REEL_T I

Cassette mechanism reel pulse input

57 NC -

58 NOISE I Noise level

59 SMETER I S-meter level

60 MODE I

Cassette mechanism mechanism

position mode pulse input

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

Cassette mechanism submotor control

79 SUB_M O

Cassette mechanism submotor control

80 KICK O Cassette mechanism kick control

81 R_DATA I RDS data

82 QUAL I RDS quality

83 PACK_IN I

Cassette mechanism tape insertion

detection

84 MUSIC O Cassette mechanism blank space

detection

85 MSGV O

Gain switching during tape search on

Cassette mechanism

86 F/R O

Cassette mechanism F/R switching

87 METAL I

Cassette mechanism metal detection

88 DOLBY O

Cassette mechanism Dolby switching

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

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

MICROCOMPUTER'S TERMINAL DESCRIPTION

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

●Terminal Description

GX-608EF2

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)

MICROCOMPUTER'S TERMINAL DESCRIPTION

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

●Terminal Description

GX-608EF2

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

H: 33.8688 MHz L: 16.9344 MHz

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

Spindle servo phase synchronization signal output

H = CLV L = rough servo

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

terminal

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

(communications line with system microprocessor)

94 /CLK I/O 12C bus clock line

(communications line with system microprocessor)

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

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

99 OUTL O Lch audio output

100 AVSS1 I Analog circuit GND

MICROCOMPUTER'S TERMINAL DESCRIPTION

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