Kenwood KDC-7090-Y, KDC-7090-R Service Manual

CD RECEIVER

KDC-7090R/Y

SERVICE MANUAL

● KDC-7090R

B51-7714-00(S) 1954

K3i

47Wx4

Knob(VOL) (K25-1222-03)

DC cord (E30-4942-05)

Front glass (B10-3264-01)

KDC-7090R

LOUD

Panel assy (A64-2161-02)

SCAN RDM REP M. RDM

Knob(1-6) (K25-1223-03)

Plastic cabinet assy (A02-1497-03)

Torsion coil spring (G01-2924-04)

PTY

COMPACT

DIGITAL AUDIO

TEXT

DISP

VOL ADJTINAME.S

PWR OFF

AUD

DAB

Knob(FM/AM) (K25-1225-03)

Remote controller assy (A70-0886-15)

CLK

ANG

Knob(EJECT) (K25-1226-03)

Screw set (N99-1704-05)

Mounting hardware assy (J21-9716-03)

Lever (D10-4562-04)

Antenna adaptor (T90-0523-05) (T90-0534-05)

KDC-7090R/Y

PLL+B

FM+B

AM+B

DIMMER

MUTE

2WAY

DET.

ACC

SRM

BU DET.

SRM

DRIVER

A8V

SERVO

SW5V

BU5V

P CON

ANT-CON

MUTE

DRIVER

MUTE

POWER IC

IC4

u-COM

IC1

IC8

Q37-40

IC2

F/E

MECHA

E-VOL

PRE OUT

SP-OUT

DIMMER

TEL-MUTE

ACC

ANT-CONT

P-CON

BACK UP

3600mV

1372mV(E)

1800mV(K,M)

855mV(E)

600mV(K,M)

DECORDER

RDS

IC14

Q52

Q14

Q15

Q31

Q26-29

Q1,2Q3

Q30

IC15

IC2

IC1

EX.AMP CONTROL

AVR

RESET IC

IC16

BUFFER

Q36

NOISE

CONTROL

EX.AMP

PANEL 5V

Q7,8

Q10-13

Q4-6

ILLUM

BUFFER

SW14V

E-VOL

PREOUT

PRE OUT LEVEL

ATT

CD MECHA

CD,MD-CH

S-METER

QUAL

SERVO+B

MO SW

STOP

MUTE

SW2

LO/EJ

RST

SW3

SW1

SDA

SCL

A8V

BU5V

SW5V

RST

REQ C

CLK

CH-CON

DATA H

REQ H

MUTE

PRE MUTE

RESET

DIMMER

KEY REQ

L DATAS

L CE

L DATAL

L CLK/PANEL

REMO

SRM SW2

SRM SW3

SRM DET

SRM SW1

RDCK

RDDA

QUAL

SDA

SCL

AFS

S-METER

A8V

PLL CLK

PLL DATA

S-METER

SW5V

DATA C

BACK UP

3795mV

2005mV

1512mV

656mV

926mV

1200mV

896mV

850mV

207mV

470mV(K,M)

251mV(E)

230mV(K,M)

230mV(E)

IFC OUT

AUDIO OUT

SW5V

NOISE

IFC OUT

SRM SUBSRM SUB+

DRIVER

MUTE

BU5V

LEVEL DIAGRAM

LCD

(BACK LIGHT

W-LED)

LCD DRIVER

G/R SW

KEY

MATRIX

LCD TYPE (X13-999)

(X13-996)

REMO

RESET

PANEL 5V

DIMMER PWM CONTROL

BLOCK DIAGRAM

KDC-7090R/Y

MICROCOMPUTER'S TERMINAL DESCRIPTION

System µ-com: UPD703033GC053

●Terminal description

Pin Function I/O Description Processing Operation

1 AM+B O AM power terminal H: During AM radio operation 2 FM+B O FM power terminal H: During FM radio operation

H: During FM radio operation if with RDS, RBDS

AFS

4 PLL-DATA I/O Data I/O terminal to F/E 5 PLL-CLK I/O CLK terminal to F/E 6 Evdd - Positive power terminal 7 Evss - GND terminal 8 N.C O Open (not used)

9 BEEP O BEEP output terminal 10 N.C O Open (not used) 11 PRE-MUTE L O L (during CD): when M MUTE L is L (low)

12 PRE-MUTE R O L (during CD): when M MUTE R is L (low)

13 IC2-SDA I/O IC2, IC5, CD mechanism, DATA line 14 IC2-SCL O IC2, IC5, CD mechanism, CLK line 15 N.C O Open (not used) 16 N.C O Open (not used) 17 N.C O Open (not used) 18 TEST - Test terminal 19 P-MUTE O Power IC MUTE terminal L: During Power-OFF L: During All-OFF

20 P-STBY O Power IC STBY terminal 21 MUTE O MUTE termianl ON: Open OFF: L 22 N.C O Open (not used) 23 N.C O Open (not used) 24 ACC-DET I ACC detection terminal L: ACC H: No ACC 25 DIMMER I Small detection terminal ON: L OFF: H 26 SW5V O 5 volt power terminal ON: L OFF: H 27 EXT-AMP-CO O External AMP control terminal (200ms) L 40ms: Bus boost OFF

28 P-CON O Power control terminal Power ON: H Power OFF: L 29 ANT-CON O Antenna control terminal TUNER, TI ON: H Open if no ANT-CON 30 P-ON O SW14V control terminal Power ON: H Power OFF: L 31

RESET 32 XT1 I Subclock terminal Time count Operation during Power-OFF 33 XT2 - Subclock terminal 34 REGC 35 X2 - Main clock terminal Oscillates: During Power-ON

36 X1 I Main clock terminal 37 Vss - GND terminal 38 Vdd - +B terminal 39 CLKOUT O Internal system clock output 40 N.C O Open (not used) 41 N.C O Open (not used) 42 TYPE0 I Destination selector port 43 TYPE1 I Destination selector port 44 TYPE2 I Destination selector port 45 N.C O Open (not used) 46 IC2TYPE0 I IC2 destination terminal L: During default

O Switching terminal for noise detection L: During AF search, FM seek

H: During receive

L during momentary power down Fixed at H only during 2 zone

L: During Tell-mute Power IC ON: H. Power IC OFF: L. During All-OFF: H

L 70ms: Bus boost LOW L 100ms: Bus boost HI

I Reset IN terminal H: Normally H: During reset

Capacitor output terminal for regulator inside microprocessor

Oscillates stop: During Power-OFF, during momentary power down

KDC-7090R/Y

MICROCOMPUTER'S TERMINAL DESCRIPTION

Pin Function I/O Description Processing Operation

47 IC2TYPE1 I IC2 destination terminal L: During default 48

CH-REQH

49 CH-RST O Reset output to changer Normally L, after system RST reset is ”H” for 50 CH-MUTE I Mute request from changer ON: H OFF: L

51 CH-CON O Changer control output ON: H OFF: L 52 ILL-ON O FL, illumination output ON: H OFF: L 53 M-MUTE L I Mute request from CD mechanism ON: L 54 M-MUTE R I Mute request from CD mechanism ON: L 55 BVdd - +B terminal 56 BVss - GND terminal 57 M-RST O Reset output to CD mechanism Normally H, L:During reset

58 M-STOP O Stop request to CD mechanism Stop: L H: During CD 59 N.C O Open (not used) 60 LO/EJ I/O CD mechanism, LODING, EJECT selector Stop, Brake: Hi-z, LOADING: L, EJECT: H 61 MOSW O CD mechanism, MOTOR, SW LOADING, EJECT, Brake: H 62 N.C O Open (not used) 63 CD-SW3 I CD down SW detection terminal Chucking: H 64 PAN-RESET O Reset output to panel microprocessor 65 MC-REQ/PAN I/O 66 N.C O Open (not used) 67 N.C O Open (not used) 68 N.C O Open (not used) 69 N.C O Open (not used) 70 AVCONT O AD reference voltage control output Same timing as P ON H: During operation 71 Avdd - +B terminal 72 Avss - GND terminal 73 Avref I 74 PHONE I PHONE detection terminal Tel mute: Min 1 volt, Navi mute: Max.2.5 volt 75 SRM-SW3 I Mask mechanism position detection input See 01mask mechanical position detection chart 76 SRM-SW1 I Mask mechanism position detection input See 01mask mechanical position detection chart 77 SRM-SW2 I Mask mechanism position detection input See 01mask mechanical position detection chart 78 SRM-DET I Mask mechanism detection input L: Mechanism H: No mechanism 79 NOISE I FM noise detection terminal 80 S-METER I S meter detection terminal 81 R-DATA I RDS DECODER DATA input terminal Connect to GND: On models without RDS,

82 R-QUAL I RDS DECODER QUAL input terminal Connect to GND: On models without RDS, 83 IFC-OUT I F/E IFC OUT input terminal L: When station present

84 N.C I Open (not used) Connect to GND 85 N.C I Open (not used) Connect to GND 86 SRM-B O SRM mechanical submotor output terminal 87 R-CLK I RDS DECODER CLK input terminal Connect to GHD: On models without RDS,

88 CH-REQC I Input request from changer ON: L 89 SC-REQ I 90 CD-SW1 I LOADING SW detection terminal LOADING start: L 91 CD-SW2 I 12cm disk detection switch terminal 12cm DISC: L 92 SRM+B O SRM mechanical submotor output terminal 93 BU-DET I Momentary power down detection terminal L: B.U H: No B.U (momentary power down) 94 CH-DATAC I Data input terminal from changer 95 CH-DATAH O Data input terminal to changer 96 CH-CLK I/O CLK I/O terminal used with changer 97 SC-DATA I Data line from panel microprocessor 98 MC-DATA I/O Data line to panel microprocessor 99 MC-CLK O CLK terminal to panel microprocessor

100 PAN5V O Panel 5 volt control terminal L: Panel H: No panel

O Request output to changer

REQ terminal/panel detection for panel microprocessor

Reference voltage supply terminal for A/D converter

Communication request from panel microprocessor

400ms and then ”L”

Per mechanical control specs.

Normally H, L: During reset, momentary power down L: During panel use

RBDS RBDS

RBDS

ADJUSTMENT

KDC-7090R/Y

Test Mode

1. How to enter test mode

While holding the FM key and the Preset 6 key, reset the unit.

2. How to exit from test mode.

While holding down the Preset 6 key, reset the unit. Note: Does not exit from test mode ACC-OFF, Power-OFF or Momentary power down

3. Test mode reset status

•Sources are all OFF

•All display segment lit up

•Volume at -10dB (shows 30 on display)

•LOUD is OFF.

•CRSC is OFF regardless of whether switching function is

provided.

•SYSTEM Q is in FLAT

•Blank skip is OFF. (C/R model)

•LEDs are white, no scanning. (VLCD model)

4. Special displays in Tuner

When the following displays appear in tuner mode it shows a problem with the front end.

•“TNE2P NG” ..... F/E is not aligned and EEPROM is in

reset (no settings) such as when shipped.

•“TNCON NG” .... Cannot communicate with F/E (front

end).

5. K3I switching

Each time the Preset 6 key is pressed in Tuner mode, switches one at a time through the following sequence: AUTO → Forced Wide → Forced Middle → Forced Narrow

→ AUTO. When reset, displays the following in AUTO.

•AUTO ................ FMA

•Forced Wide ..... FMW

•Forced Middle ... FMM

•Forced Narrow .. FMN

6. CD receiver test mode specifications

•No automatic ejection during reset-start. Does not make a

CD check in reset with a CD loaded.

•Using the Track up key jumps to the following tracks.

No.9→No.15→No.10→No.11→No.12→No.13→No.14→and back to No. 9

•Using the Track down key moves 1 track downwards from

the track being played.

7. Audio items

•Momentarily pressing the Q key calls up audio adjustment

mode.

•Pressing the ∗ key on the remote control calls up audio

alignment mode.

•Continuous forward is disabled on the remote control.

•Bass/Middle/Treble are settable in 3 steps of MIN/

CENTER/MAX with the Track up/down keys.

•Balance is settable in 3 steps of Left MAX/CENTER/Right MAX with the Track up/down keys.

•Fader is settable in 3 steps of Rear MAX/CENTER/Front MAX with the Track up/down keys.

•HPF is settable in 2 steps of THRU/220Hz with the Track up/down keys.

•LPF is settable in 2 steps of THRU/120Hz with the Track up/down keys.

•Bass f/Bass Q/Bass EXT/Middle f/Middle Q/Treble f do not appear in the audio alignment.

8. Menu items

•Momentarily pressing the CLK key calls up the Menu mode.

•The DNPP/SBF keys on the remote control calls up Menu

mode.

•Continuous forward is disabled on the remote control.

•Calendar adjust, calendar display switching and calendar

memo are eliminated from forward (FL model)

•In color alignment mode, Preset 1 is red, 2 is blue, 3 is green and 4 is white. (VLCD model).

•Contrast is set in 3 steps of 0, 5, 10 and the reset value is

5. (VLCD/LCD models)

•Brightness adjustment is set in 3 steps of 0, 5, 10 and the reset value is 10. (Normal FL model)

9. Backup current measurement

The MUTE terminal turns off 2 seconds (not 15 seconds) after being reset in ACC off (backup on). (The panel, CD and tape mechanisms are disabled during this time.)

10. Special displays during All-Off with all lamps on

The following displays appear when the preset keys are pressed with all display segment lit up.

PRESET1 Version display (8 digits; Mo. Dy. Hr. Mn.)

(Display) SYS XXXXXXXX system microprocessor

PAN XXXXXXXX panel microprocessor

PRESET2

PRESET3

PRESET4 Press once: TAPE/CD/MD operating time display.

PRESET5 Press once: TAPE/CD/MD eject count display.

PRESET6 Press once: PANEL open/shut count display.

Serial No. display (8 digits) Note: CD/RK type eXcelon model

(Display) SNo XXXXXXXX

Press once: Power-on time display (Does not count during All-Off)

Press long: Clears the time display during power-on. (Display) PonTim XXXXX (C/R) MAX 65535(time)

Press long: Clears TAPE/CD/MD operating time. (Display) CDTime XXXXX (CD/R)

TapTim XXXXX (C/R) MAX 65535(time)

Press long: Clears TAPE/CD/MD eject count display. (Display) EjeTim XXXXX MAX 65535(count)

Press long: Clears PANEL open/shut count display. (Display) PnCnt XXXXX MAX 655350(count)

KDC-7090R/Y

ADJUSTMENT

11. Others

•Automatic panel close is disabled when tape or CD is inserted. (M&T model)

•Panel operation is disabled at Power-ON or Power-OFF. (M&T model)

•Panel open and closes with the ATT key. (M&T model)

•No displays such as “CODE OFF” during Power-ON.

•Pressing the TI (AUTO) key during changer operation turns

on 2zone. Cancel by pressing the TI (AUTO) key again. The P/S dot is lit during 2zone.

•Pressing the CLK key for 1 second or more during All OFF, calls up the Mask Key (security) write mode.

Security items

• Forced power-ON mode (all models)

Even when writing is permitted by the security function (mask key), Power-on can be set for a 30 minute period each time the reset key is pressed while holding down the ATT key and Preset 4 keys. After 30 minutes elapses, can only be restored by using reset.

• How to register the security code for EEPROM (F/E)

replacement (coded security models)

1. While holding the FM key and the preset 6 key, reset the

unit.

2. Call up security register mode by pressing the CLK key.

3. Enter the code with the Preset 1/2/3/4 keys.

For example, to enter the number, “3510”....

- Press the Preset 1 key 4 times.

- Press the Preset 2 key 6 times.

- Press the Preset 3 key 2 times.

- Press the Preset 4 key 1 time.

4. Hold down the DISP key for at least 3 seconds and the

message, “RE-ENTER” appears, so once again enter the code according to Step 3 above.

5. Hold down the DISP key for at least 3 seconds, and the

message, “APPROVED” appears.

6. Cancel test mode. (See, 2. How to cancel the test mode.)

Note: All clear cannot be performed on the security code for this model.

• Simple way to clear the security code (K type only)

1. During code request mode, press the VOL UP key for at

least 3 seconds while holding down the DISP key. (---- will disappear)

2. Enter, “KCAR” with the remote controller as described

below. (Same as on 00 model.) Press the remote controller 5 key twice, and press the Track Up key. (Enters a “K”) Press the remote controller 2 key three times, and press the Track Up key. (Enters a “C”) Press the remote controller 2 key once, and press the

Track Up key. (Enters an “A”)

Press the remote controller 7 key twice, and press the Track Up key. (Enters an “R”)

3. Security function is canceled and unit sets to All-Off mode.

4. Code request mode appears if a mistake was made in entering the numbers.

• Mask key write method on initialized EEPROM

1. While holding the FM key and the preset 6 key, reset the unit.

2. Press the CLK key to call up mouse key register mode. The message, “TRANSMIT 1” appears. The display at this time shows “< >“ rather than “[ ]”.

3. Face the mask key towards the photosensor and hold down for half a second or longer.

4. When “TRANSMIT 2” appears, again hold down the mask key for at least half a second. The first and second counter codes are not compared at this time.

5. When the message, “APPROVED” appears, the writing is complete. The demo mode is set at this time and test mode is canceled.

Note: Just as with the previous model, if 30 minutes elapses

and the code is not written, then an error is issued and power-OFF is triggered.

• How to initialize the mask key (Return to factory settings

from mask key write permit status.)

1. While holding the FM key and the preset 6 key, reset the unit.

2. The message, “TRANSMIT 1” appears and mask key request mode is called up. The display at this time shows “∗ ∗” rather than “[ ]”.

3. Cancel the mask key on the remote control by holding down for at least 3 seconds.

4. When “TRANSMIT 2” appears, again hold down the mask key for at least 3 seconds.

5. When the message, “APPROVED” appears, the mask key is canceled, demo mode is set, test mode is canceled, and the factory settings restored.

• How to All-Clear the mask key

1. While holding the FM key and the preset 6 key, reset the unit.

2. Press the CLK key to call up mouse key register mode. The message, “TRANSMIT 1” appears.

3. Face the mask cancel key towards the photosensor and hold down for 3 seconds or longer (until level reaches full).

4. When “TRANSMIT 2” appears, again hold down the mask key for at least 3 seconds. If “TRANSMIT 1” appears at this time, then redo the procedure, starting from step 3.

5. When the message, “APPROVED” appears, all-clear has been performed on the security data and operation returns to the Mask key write method on initialized EEPROM.

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