Kenwood DPX-5050 Service manual

CD CASSETTE DSP RECEIVER

DPX-5050

SERVICE MANUAL

DIGITAL SIGNAL

PROCESSOR

AUD

FM+

B NR

DISC

SCRL 1 SCN 2 RDM 3 REP 45M. RDM 6

USER B.S METAL

CD CASSETTE DSP RECEIVER

OPEN

DISP

DIGIT

DPAC

ATT

COMPACT

AL A

NAME.S

PWR OFF

UDIO

FNC

CD-R/CD-RW AVAILABLE

CRSC

SRC

S.A

DOLBY B NR

DIGITAL

PULSE

AXIS

CONTROL

Refer to the Destination "M1" of service manual DPX-4020's parts list (B51-7776-00)

except the following parts.

PARTS LIST

New Parts

✽

Ref. No. d e Parts No. Description Ref. No. d e Parts No. Description

AN dw

250 2E✽K24-4084-03 KNOB (CD EJECT) 251 2E

254 3H

255 1H K25-1288-03 KNOB (CASSETTE EJECT) 256 3H K25-1467-02 KNOB (SRC) 257 2H K25-1468-02 KNOB (SEEK) 258 3H K25-1469-02 KNOB (FM) 259 3H K25-1470-03 KNOB (VOL)

260 3H K25-1471-02 KNOB (1-6)

271 1F N99-1724-05

204 205

PA1 213

DPX-5050

A22-3020-02 SUB PANEL ASSY 252 3H K24-3891-03 KNOB (DSP)

✽

A22-3021-01 SUB PANEL 253 3H K24-3892-03 KNOB (EQ)

✽

A64-3125-02 PANEL ASSY

✽

B10-4429-01 FRONT GLASS

✽

H54-2914-03 ITEM CARTON CASE

✽

AN dw

K24-4086-03 KNOB (OPEN)

✽

K24-4085-03 KNOB (SA)

✽

SCREW SET

2001-5 PRINTED IN JAPAN

B51-7776-00 (N)1734

CD CASSETTE DSP RECEIVER

DPX-4020

SERVICE MANUAL

AUD

DIGITAL SIGNAL

PROCESSOR

FM+

DISC

B NR

SCRL 1 SCN 2 RDM 3 REP 45M. RDM 6

ATT

USER B.S METAL

DISP

DIGITAL

PULSE

AXIS

CONTROL

NAME.S

PWR OFF

FNC

CD-R/CD-RW AVAILABLE

SRC

S.A

CD CASSETTE DSP RECEIVER

OPEN

DPAC

COMPACT

DIGITAL AUDIO

DOLBY B NR

Screw set

(N99-1701-05) : M type

DC cord

(E30-4939-05)

Screw set

(N99-1711-05) : K type

Knob (VOL) (K25-1302-03)

Escutcheon assy

(B07-3046-04)

Front glass

(B10-4063-01) : K type

(B10-4064-01) : M type

Escutcheon assy

(B07-3047-04) : K type

Panel assy

(A64-2383-02) : K type

(A64-2384-02) : M type

Knob (CD EJ)

(K24-3716-03) : M type

(K24-3717-03) : K type

Badge

(B43-1284-04)

Dressing panel

(A21-4102-02)

DPX-4020

SWITCH UNIT (X25-8970-00)

DOLBY UNIT

(X87-3040-00)

CASSETTE MECHA

CD MECHA

(X16-1250-00)

SUB PANEL UNIT

SYSTEM u-CON MN101C15

VOL

BASS

INPUT SEL

ISO

NC. MPX

PWR AMP

FRONT SP OUT

REAR SP OUT

MUTE

TC4066FB

ANALOG SW

TA8263BH

PRE OUT

FRONT

FRONT/REAR/N-F (J TYPE)

PRE OUT

E VOL, TONE, NC, MPX TDA7407

TRE

MD/CD CHANGER

DSP M65849BFP

VFD

PANEL u-CON

REMOCON

KEY MATRIX

VOL

SOFT MUTE

MN101C10

AMP-CTRL

ANT CON

CXA2560Q

LB1641

F/E

ANT.

PLAY HEAD

MODE

PAC K DET

STBY

PAC K IN

TAKEUP REEL SUPPLY REEL

REELT REELS

MID

RST SW

BPF

ANALYZER

SPECTRUM

BA3129F

SW OP

MUTE

(K,M) TYPE ONLY

REAR/N-F (K,M TYPE)

NAVI MUTE

SMALL DET

ACC DET

BU DET

5V AVR

FM8V SW

AM8V SW

P CON

5V AVR

5V SW

MOTOR SW

MAIN

A8V AVR

BU5V AVR

+7.5V

CD SRV

AVR

DC/DC +B SW

DC/DC +B

SDA

SCL

RESET

FSD OUT FM SD

PWR SVR

PWR STBY

PWR TEST

MUTE

AUDIO OUT

SCL

FM SD

FSD

SDA

AM ANT

FM ANT

AUD +B FM +B AM +B F/E 5V

SW1-3

MRST

CD MOTOR

ANT CON

P CON

LINE MUTE

ILLUMI

ACC

B. U

GND

P MUTE

BU DET

ACC DET

ILL CON

LANP

P CON

BU 5V

CD CH

+6dB

0dB

DSP 5V

FL +BBU 5V

LED +B

FM +B

AM +B

LED +B

F/E 5V

B. U

B.U

BU 5V

AUD +B

SDA

SCL

PON 5V

BUZZ

DSP STBY

DSP DATA

DSP CLK

(-0.5dB)

AUDIO OUT

AMP CTRL

AMP-CTRL

P CON

MOTOR +B

CD SRV +B

DSP 5V

AUDIO +B

BUZZ

PWR STBY PWR TEST

PWR SVR

SCL

SDA

FRONT

REAR

FM AM +10dB

P ANT

BU 5V

PN SC CON

PN SC REQ

PN SC DATA

PN MC REQ

CD MUTE

CD LO/EJ

CD MSTOP

F-IN(L) VREF R-IN(L) F-IN(R) R-IN(R)

SUB MOTOR DRIVER

SUB

MAIN

REV RchRch

FWD

Lch

REV

Lch

FWD

A OUT

AM : +3dB

CAS : +0dB FM : +1dB

CD CH : +2dB

CH DATA H

CH CON CH REQ H CH REQ C

CH DATA C CH CLK

RESET

MUTE

CD SRV +B

BU 5V AUD +B

BU 5V AND +B

CD SRV +B

MOTOR +B

AUD +B

INPUT

PREOUT

NON-FAD

PWR MUTE

DSP-DATA DSP-STBY

DSP-CLK

P ON

P ANT

BU DET

ACC DET

AMP CTRL

P MUTE

u MUTE

LAMP

ILL CON

MIAN-M

PN MC CLK

PN MC DATA

C SUB M-

C SUB M+

R REEL

F REEL

C MODE 3

C MODE 2

C MODE 1

C MUTE

C MSC

C MUSIC

C F/R

C MTL

C NR

SW1-3 MRST

CD MSTOP

CD MOTOR

CD LO/EJ CD MUTE

MPX OUT

DSP OFF

-4dB DSP ON

-4dB

-12dB +15dB

CAS

PWR MUTE

+10.6dB

RESET

PN MC REQ

PN MC CLK

PN MC DATA

PN SC CON PN SC DATA

PN SC REQ

REMOCON

AUD +B

FRONT

REAR

PREOUT

NON-FAD

(-0.5dB)

CPH3105

PON 5V

BU 5V

MAIN-M

P ON

SUB PANEL

CH REQ H

CH CLK

CH DATA C

CH REQ C CH DATA H

CHCON

CAS : 440mV

AM : 170mV

FM : 340mV

CD CH : 1200mV

AM : 170mV

FM : 340mV

CD : 1200mV

CD CH : 956mV

FM : 480mV

CAS : 277mV

AM : 151mV

CAS : 440mV

CD CH : 1200mV

AM : 170mV

FM : 680mV

DSP OFF

AM : 477mV

FM : 1516mV

CAS : 1557mV

CD CH : 3010mV

(STADIUM)

AM : 202mV

CAS : 370mV FM : 680mV

CD CH : 1270mV

DSP ON

AM : 120mV

(STADIUM)

FM : 381mV

CAS : 220mV

CD CH : 756mV

DSP ON

CD CH : 2858mV FM : 1431mV AM : 450mV

CAS : 440mV

BLOCK DIAGRAM

DPX-4020

● SYNTHESIZER UNIT (X14-6710-XX)

COMPONENTS DESCRIPTION

Ref.No.

Component Name Application/Function Operation/Condition/Compatibility

IC1 MN101C15FCP System micom IC2 TDA7407 Electronic volume IC3 TC4066BF(N) Analog SW Voice signal input switching (CD,.MD,CASSETTE) IC4 M65849BFP DSP IC IC5 BA3129F Switching ope-amplifier Voice signal output switching (FRONT

REAR) IC7 TA8263BH PWR IC IC8 LB1641 Motor driver For cassette mechanism sub-motor IC9 PST9135NR Reset IC Reset 3.5V voltages

IC10 TC7W02FU Logic IC(OR) Rogic circuit for MUTE IC11 M5237ML Power source IC Reg for A8V

Q1 2SC4081 Power source SW for F/E VDD 5V ON:F/E VDD 5V output Q2 CPH3105 Power source SW for FM ON:FM+B 8V output Q3 CPH3105 Power source SW for AM ON:AM+B 8V output

Q4 FMG1A Power source control SW for FM/AM ON:FM+B/AM+B 8V output Q101 2SB1443 Power source SW for main motor ON:Main motor ON Q102 DTC144EK Power source control SW for main motor ON:Main motor ON Q201 DTC143TK MUTE SW Q202 DTC143TK MUTE SW

ON:MUTE

Q301 DTC143TK MUTE SW Q302 DTC143TK MUTE SW Q401 DTC124EUA SW for electronic volume mute ON:MUTE Q402 FMC2A SW for analog switch control Q403 DTC144EUA SW for switching ope-amplifier control Q404 DTC144EUA SW for power IC mute terminal contorol ON:Temperature protection OFF (Test mode) Q405 DTA114EUA Control terminal for MUTE (preout) ON:MUTE Q406 DTA114EUA Control terminal for MUTE (preout) ON:MUTE Q407 DTA114EUA SW for electronic volume mute ON:MUTE Q601 DTC114YUA SW for system micom reset ON:REEST Q602 DTA124EUA SW for RESET IC output ON:REEST Q701 DTC144EUA SW for BU serge detection ON:Serge(power down) Q702 FMW1 SW for BU/ACC detection ON:Power down Q703 DTC144EUA SMALL detection SW ON:SMALL ON Q705 DTA124EUA SW for external amplifier control Q706 2SB1277(Q,R) SW for P-CON ON:P-CON output Q707 2SA1037K

SW for P-CON over-electric current protect

ON:Stop P-CON output

Q708 DTA124EUA

Control

SW for P-CON over-electric current protect

ON:Stop P-CON output Q709 DTC114YUA Control switch for P-CON ON:P-CON output Q710 2SB1277(Q,R) SW for P-ANT ON:P-ANT output Q711 DTC114YUA Control switch for P-ANT ON:P-ANT output Q712 2SB1548(P) Power source switch for BU 5V Q713 2SC4081

Power source switch for BU 5V (Darling ton) Q714 IMD16A Power source switch for PON 5V ON:PON 5V output Q715 FMC2A

Power source control switch for analog+B

ON:Analog+B 8V output Q716 2SB1548(P) Power source switch for analog+B ON:Analog+B 8V output Q717 2SD1766 Power source switch for DSP+B ON:DSP+B 5V output Q718 FMC2A Power source control switch for servo+B ON:Servo+B 7.5V output Q719 2SB1548(P) Power source switch for servo+B ON:Servo+B 7.5V output Q720 2SC4081

Power source switch for servo+B(Darling ton)

ON:Servo+B 7.5V output Q724 2SB1548(P) Power source switch for servo+B ON:Servo+B 7.5V output Q901 FMC3A

Power source control switch for ILLUMI+B

ON:ILLUMI+B 14.4V output Q902 2SB1446

Power source switch for ILLUMI+B (Darling ton)

ON:ILLUMI+B 14.4V output Q903 2SC4081 Power source switch for ILLUMI+B ON:ILLUMI+B 14.4V output

DPX-4020

● SUB CIRCUIT UNIT (X16-1250-00)

Ref.No.

Component Name Application/Function Operation/Condition/Compatibility

IC1 SBX-3050 Remote control IC Light receive port of remote controller

● DOLBY UNIT (X87-3040-00)

Ref.No.

Component Name Application/Function Operation/Condition/Compatibility

IC1 CXA2560Q DOLBY IC PRE-AMP/DOLBY-EQ

Q1 KRC103S

Between-music detection level adjustment FF/REW

FF/REW ON

● SWITCH UNIT (X25-8970-00)

Ref.No.

Component Name Application/Function Operation/Condition/Compatibility

IC1 MN101C10AAL Panel micom Display mechanism & key matrix control

IC2 BA3830F BAND PASS IC (Spectrum analyzer)

Signal data from X14 are displayed with

strength of frequency Q1 DTC114EUA RST switch H:RST Q2 2SK3018 Analog signal AGC Auto gain control of analog signal Q3 UMC3N SW5V H:ON Q4 FMC4A SW for VFD logic power source H:ON Q5 DTC114EUA VFD branking control H:ON

COMPONENTS DESCRIPTION

DPX-4020

● SYSTEM µ-COM (IC1:X14-6710-XX) MN101C15FCP

Pin.No.

Pin name I/O Description

Processing Operation

1 VREF- - Connected to GND.

2 NC I Not used. Connected to GND.

3 FM_SD I FM SD input.

4 F_REEL I Reel pulse (FWD) detection. Hi-Z

5 R_REEL I Reel pulse (REV) detection. Hi-Z

6 NC I Not used. Connected to GND.

7 ACC_DET I Acc detection input.

8 SMALL I SMALL detection input.

9 LINE MUTE I LINE MUTE detection input.

10 VREF+ - A/D converter. Reference voltage input terminal.

11 VDD - Main power input.

12 X' Tal (8.38) O Connected to main clock.

13 X' Tal (8.38) I Connected to main clock.

14 VSS - Connected to GND.

15 XI I Connected to GND.

16 XO O Open.

17 MMOD I Connected to GND.

18 PN_MC_DATA O Data output to panel micom.

19 PN_SC_DATA I Data input from panel micom.

20 PN_MC_CLK O Clock output to panel micom.

21 CH_DATAH O Data output to CD-CH.

22 CH_DATAC I Data input from CD-CH.

23 CH_CHCLK I/O

Previous bus : Data input from CD-CH. New bus : Data output to CD-CH.

24 BEEP O Beep output.

25 RESET I System reset.

26 CH_REQH O Send request output to CD-CH.

27 CH_CON1 - Operation control of CD-CH1.

28 CH_CON2 - Operation control of CD-CH2.

29 P_ANT - Power ANT control.

30 P_CON - External amplifier power control.

31 BU_DET I Back up detection input.

32 CH_REQC I Send request input from CD-CH.

33 PN_SC_REQ I Send request input from panel micom.

34 SEL1 - IC2$ noise cancellation selection.

35 SEL2 - IC2$ noise cancellation selection.

36 SDA I/O I2C data input/output.

37 NC - Not used. (Open)

38 SCL O I2C clock output.

39 P_ON - Internal power control.

40 LAMP - Key illumination control.

MICROCOMPUTER'S TERMINAL DESCRIPTION

DPX-4020

Pin.No.

Pin name I/O Description

Processing Operation

41 PN_MC_REQ O Send request output to panel micom.

42 PN_SC_CON O Operation control output of panel micom.

43 NON_FAD O Control Non-Fad output. (ON/OFF)

44 MUTE O Audio mute output.

45 TYPE1 I Destination type input.

46 TYPE2 I Destination type input.

47 PNL_OPEN - Panel open detection.

48 C_SUB_M- O C mechanism loading motor control. L

49 C_SUB_M+ O C mechanism loading motor control. L

50 C_MAIN_M O C mechanism motor control. L

51 C_MODE3 I Sub-motor control SW3 (pack-in detection). Hi-Z

52 C_MODE2 I Sub-motor control SW2. Hi-Z

53 C_MODE1 I Sub-motor control SW1. Hi-Z

54 CD_SW1 I Input from CDSW1.(loading start SW)

55 CD_SW2 I Input from CDSW2.(12cm disc detection SW)

56 CD_SW3 I Input from CDSW3.(down &limit switch)

57 CD_LO/EJ - CD mechanism loading motor control .(LO/EJ)

58 CD_LMON - CD mechanism loading motor control .(ON/OFF)

59 CD_MSTOP O Stop output to CD mechanism computer.

60 CD_MRST O Reset output to CD mechanism.

61 CD_MUTE I Mute input from CD mechanism.

62 C_MUTE O EQ mute selection SW. L

63 C_F/R O FWD/REV selection. L

64 C_MSC O Between-music detection mode control. L

65 C_NR O DOLBY control.(ON/OFF) L

66 C_MS_IN I Between-music pulse detection input. Hi-Z

67 C_MTL O METAL control.(ON/OFF) L

68 DSP_DATA O Data output to DSP.

69 DSP_CLK O CLK output to DSP.

70 DSP_STB O Latch output to DSP.

71 INPUT - Control input selected SW.

72 NC - Not used.

73 FM+B - FM power.

74 AM+B - AM power.

75 FSD_OUT - Station-meter detection.

76 TEST - Power IC control.

77 PW_MUTE - Power IC mute control.

78 PWIC_STBY - Power IC standby control.

79 PWIC_SVR - Power IC control.

80 AMP_CTRL - External amplifier control.

MICROCOMPUTER'S TERMINAL DESCRIPTION

DPX-4020

● PANEL µ-COM (IC1 : X25-8970-00) MN101C10AAL

Pin.No.

Pin name I/O Description

Processing Operation

1 ANA4 I Spectrum analyzer input.(1kHz) H(Hi-Z)

2 ANA5 I Spectrum analyzer input.(3.3kHz) H(Hi-Z)

3 ANA6 I Spectrum analyzer input.(10kHz) H(Hi-Z)

4 NC I Not used. Connected to GND. L(Hi-Z)

5 NC I Not used. Connected to GND. L(Hi-Z)

6 VREF+ I A/D converter. Reference voltage input terminal. -

7 VDD - Main power input. -

8 OSC2 - Main clock connection.(16.0MHz) -

9 OSC1 - Main clock connection.(16.0MHz) -

10 VSS - Connected to GND. -

11 XI I Connected to GND. L

12 XO O Not used.(Open) -

13 MMOD I Connected to GND. L

14 PN_SC_DATA O System computer communication.Data output terminal. L

15 PN_MC_DATA I System computer communication.Data input terminal. H/L(Hi-Z)

16 PN_MC_CLK I System computer communication.Clock input terminal. H/L(Hi-Z)

17 VFD_DATA O VFD driver data output. L

18 NC O Not used.(Open) L

19 VFD_CLK O VFD driver clock output. L

20 VFD_LAT O VFD driver latch output. L

21 RST I Reset input. -

22 VFD_BK O VFD driver blank output. L

23 NC O Not used.(Open) L

24 PON O P-ON 5V control. L

25 NC O Not used.(Open) L

26 PN_SC_REQ O System computer communication.Send request output. L

27 PN_MC_REQ I System computer communication.Reception request input. H(a)(Hi-Z)

28 PN_SC_CON I System computer communication.Panel operation control. H(a)(Hi-Z)

29 REMOCON I Remote control signal input. -

30 KR0 I Key-return signal input 0. -

31 KR1 I Key-return signal input 1. -

32 KR2 I Key-return signal input 2. -

33 KR3 I Key-return signal input 3. -

34 KR4 I Key-return signal input 4. -

35 KR5 I Key-return signal input 5. -

36 NC O Not used.(Open) L

37 KS0 O Key-scan signal output 0. L

38 KS1 O Key-scan signal output 1. L

39 KS2 O Key-scan signal output 2. H

40 KS3 O Key-scan signal output 3. H

41~60 NC O Not used.(Open) L

61 VREF- I Connected to GND. L

62 ANA1 I Spectrum analyzer input.(63Hz) H(Hi-Z)

63 ANA2 I Spectrum analyzer input.(150Hz) H(Hi-Z)

64 ANA3 I Spectrum analyzer input.(330Hz) H(Hi-Z)

MICROCOMPUTER'S TERMINAL DESCRIPTION

DPX-4020

■ How to enter the test mode

While pressing on DSP + EQ or DSP + AM keys, press SRC key. It is possible to enter the test mode in this manner.

■ Test Mode Condition

When booted with all OFF. The value for the volume is -10dB. (On display: 30) Beep disabled. All lights display. CRSC: OFF (Only K/M type) DSP: Bybass EQ: Flat SEP/ANA: Peak hold

However, when entering the test mode with DSP + AM key, the volume value will be -30dB with beep enabled. The beep enable condition is such that, regardless of effective keys and non-effective keys, beeps are effective whenever keys are pressed.

■ Test Mode (Display)

Since there are many segment numbers in the display section, bridging with other segments can be confirmed (Only when the source condition is in all OFF.)

■ Test Mode (Source: CD)

When the disk is loaded, track No. 9 is the first track to be played. The following keys are operated only when the source is CD. When there are changes in the track numbers being played in other cases, the playing is continued.

>>| key selects only certain tracks. |<< key selects by going down the tracks, as with the regular

operation.

■ Test Mode (EQ Adjustment)

When displaying the source, by pressing EQ/AUD once quickly, adjustment mode is entered. When 1 key is press: Flat When 2 key is pressed: Full boost Whne 3 key is pressed: Full cut

■ The settings for Q, Feq, Ex are fixed.

Bass Q 2.0

Feq 150Hz Ext ON

Mid Q 2.0

Feq 1kHz

Treble Feq 10KHz

■ Test Mode (Audio Adjustment)

While displaying the source, by pressing EQ/AUD key in an elongated manner, adjustment mode is entered. By continuing with FM , AM key, the following items may be selected and I<< and >>I keys can be used for adjustment.

∗ For balance adjustment, three steps of Right ,. Center ,. Left

are set. (L15, R15)

∗ For fader adjustment, three steps of Front ,. Center ,. Rear

are set. (F15, R15)

∗ For the amplifier control, OFF ,. 2 ∗ Test Mode (Function at the time of ALL OFF Source)

By pressing PLAY/PAUSE key in an elongated manner during each sources, adjustment mode can be entered and the following items are selected with AM , FM keys. Adjustment will be conducted with |<< and >>| keys. The following are added to each source functions (including CD and TAPE).

For Preout adjustment, Front ,. Rear ,. N-F ∗ Preout adjustment is the first item.

■ Releasing the Test Mode

Test mode is released by RESET, ACC OFF/ON, Power OFF/ON. Also, Source, Tuner, and Audio are returned to initial condition by ACC OFF and Power OFF.

■ Backup current measurement compatible

Regardless of the test mode, when reset at ACC OFF condition (Backup is ON), MUTE will go OFF after two seconds. (The peripherals are not powered off unlit the CD/MD mechanism stops, it takes 2 seconds plus alpha.)

Adjustment

This model has no adjustment items. Tuner section adjustment is conducted for individual F/E and adjustment cannot be conducted on a set. Dolby adjustment Play the Tape TCC-130 and adjust so that -6dBm (388mV) is achieved at test points for Lch/Rch, Fwd/Rev. For each channel, common difference within 2dB (310mV - 488mV)

∗ Make an end of adjustment prior to shipment from the factory.

VR1

VR2

CN2

front

and

CN5

TEST MODE / ADJUSTMENT

A B C D E

IC1

X16-1250-00 (J74-1225-02)

CN1

X16-1250-00

IC Q

address

16A

DOLBY

DOLBYL

DOLBYR

W10

W11

C15

VR1

VR2

C16

CN4

CN3

CN2

X87-3040-00 (J74-1226-12)

C29

C28

C30

C25C26

C31 C32

C12

C11

R2R1

C20

W12

W14

R11

W13

C23

R13

C22

C14

C24

R12

R10

C17

C13

C21

IC1

X87-3040-00

IC Q

address

13D

14C

PC BOARD (COMPONENT SIDE VIEW)

(FOIL SIDE VIEW)

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

+ 23 hidden pages