Kenwood EZ-500 Service manual

CD RECEIVER

Size AA battery
(Not supplied)

Plastic cabinet assy
(A02-2735-03)

Lever
(D10-4589-04)

x2

Screw set
(N99-1719-05)

Mounting hardware assy
(J22-0011-03)

CD MECHANISM EXTENSION CORD (24P) : W05-0934-00

MODEL TDF PANEL No. TDF NAME
EZ500 Y33-2110-11 TDF-EZ500

TDF PANEL INFORMATION

Panel assy
(A64-3418-12)

DC cord
(E30-6294-05)

Screw set
(N99-1730-15)

Remote controller assy (RC-505)
(A70-2059-05)

Escutcheon
(B07-3117-02)

EZ500

SERVICE MANUAL

© 2004-8 PRINTED IN JAPAN
B53-0196-00 (N) 793

EZ500

BLOCK DIAGRAM

TUNER

AUDIO OUT

S-METER

PLL-DATA

PLL-CLK
IFC OUT

CD

MS DATA

MS CLK

M MUTE R

M MUTE L

M STOP

CH

CH CLK
DATA H

CH-CON

DATA C
CH RST

CH MUTE

SW1
SW2
SW3
SW4

M RST

LO/EJ

MOSW

REQ C

REQ H

DAUGHTER UNIT

AM+B
SW5V
A8V

SERVO+B
A8V
BU5V
CD MECHA+B

BACK UP

(X89- )

BU5V

PANEL DET

S1

EJECT SW

DSI
EJECT ILLUMI

IC1

S-METER

SYSTEM
MICROPROCESSOR

PANEL DET

EJECT

DSI

L CLK

L DATAS

IC1

LCD DRIVER
WITH
KEY MATRIX

SWITCH UNIT (X16- )

L CE

L DATAL

Q201

BUFFER

NOISE

VOL A

VOL B

ROTAR Y
ENCODER

LCD

REMO

S1

IC2

FM
AM
MP IN
LEVEL
CD
CH
AFS
QUAL

PRE MUTE

P-MUTE

EXT.AMP.CON

DIMMER

PHONE

ACC DET

B.U DET

REMOCON

RESET SW

A8V

E-VOL

MPX

MUTE

BEEP

PS1-0

PS1-1
PS1-2
PS2-0
PS2-2

RST

AUX IN

MUTE
DRIVER

Q351,352

Q355,356

THERMAL
PROTECT

EXT AMP

DIMMER

TEL MUTE

ACC DET

B.U DET

SERGE DET

Q21

SERVOSERVO+B

IC9

SW REG

BU5V

AM+B

FM+B

A8V

ILLUMI

BU5V

BU5V

PRE MUTE

PRE MUTE

BU5V

SW5V

Q32

Q31

Q3

Q2

Q1

Q4

SW 5V

FREE

AUX

&

FRONT

IC6

CD MECHA+B

IC8

RESET

IC2

Q152

PANEL 5V

IC4

Q22

SW 14V

IC3

POWER
IC

POWER
SUPPLY
IC

SW5V

PRE OUT
(REAR/NF)

PRE OUT
(FRONT)

BACK UP

BACK UP

MODE

CD,MP3

FM
AM
CH

OUTPUT

3600mV
1800mV

600mV

3600mV

SP OUT

EXT.AMP.CON

DIMMER

MUTE

ACC

BACK UP

ANT CON
P CON

COMPONENTS DESCRIPTION

● SWITCH UNIT (X16-2960-10)

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

IC1 LCD Driver Drives LCD
IC2 Remote Control IC Controls the unit
Q2 REMO ON SW The power supply of IC2 is turned on when base level goes “L”
Q3 Key Illumination SW (Red) Lights Red key-illumination when base level goes “H”
Q4 Key Illumination SW (Green) Lights Green key-illumination when base level goes “H”
Q5 Dimmer Control Lights LCD Back Light when base level goes “H”

2

COMPONENTS DESCRIPTION

● ELECTRIC UNIT (X34-3080-14)

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

IC1 System µ-COM Controls FM/AM tuner, the changer, CD mechanism, Panel, volume and tone.
IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector.

Bu5V (5V), Audio8V (8V), FM+B (8V), AM+B (8V), P-CON, ANT-CON

SW1 OUT

1.5~3.0 Audio ON

IC3 Power Supply IC

IC4 Power IC Amplifies the front L/R and the rear L/R to 50W maximum.
IC6 Muting logic IC Controls logic for muting.
IC8 Reset IC “L” when detection voltage goes below 3.6V or less.
IC9 SW Regulator Power Supply for MP3

Q1 Serge Detection

Q2 BACK-UP Detection

Q3 ACC Detection “L” when Acc is present.
Q4 SW 5V ON when the base is “L”.
Q21 Servo Regulator
Q22 Servo SW
Q23 Control Power Supply IC
Q31 Dimmer Control Dimmer ON when the base is “H”.
Q32 EXT.AMP Control Controls Ext.AMP by pulse width.
Q41 SW Regulator Control

Q151 DSI Driver DSI turns off when the base is “H”.

Q152 Panel 5V SW

Q153,154 ILL Control ILL lights when the base of Q153 is “H”.
Q201 Noise buffer

Q350

Q351 Pre / NF Mute SW Mutes the Pre Rear Lch or NF Lch when the base is “H”.
Q352 Pre / NF Mute SW Mutes the Pre Rear Rch or NF Rch when the base is “H”.

Q354

Q355 Pre Mute SW Mutes the Front Lch when the base is “H”.
Q356 Pre Mute SW Mutes the Front Rch when the base is “H”.

Pre and NF Mute SW
(not always Pre and NF)

Pre and NF Mute SW
(not always Pre and NF)

3.5~5.0 Audio P-CON ON

7.0~ Audio P-CON, P-ANT ON
SW2 OUT

2.0~3.0 ILL FM ON

4.0~ ILL AM ON

“L” when the back-up voltage becomes more than 24V (momentary power down).
“H” when the back-up voltage becomes less than 24V.
“L” when B.u is present.
“H” when B.u is absent or momentary power down is detected.

DSI lights when the base is “L”.

DSI turns on and off when panel is taken off.
When the panel is attached, the base goes “L”, turning the Tr ON to supply 5V to the panel.
When panel is taken off, panel 5V cut off.

Drives the Pre and NF Mute sw (Q351,355) when the base is “L”.

Drives the Pre and NF Mute sw (Q352,356) when the base is “L”.

EZ500

3

EZ500

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM MICROCOMPUTER : UPD703030GC052 (X34 : IC1)

Pin No. Pin Name I/O Application

1 PLL CLK I/O CLK output terminal to F/E
2 Not used O
3PANEL-DET I Panel DET terminal No panel DET : L, Panel DET : H
4 IC2 SDA I/O DATA input/output terminal with E-VOL
5 IC2 SCL I/O CLK output terminal to E-VOL
6 VDD ­7 VSS ­8 FLIP-DET I Flip DET terminal L : Panel DET, H : Panel flippable
9 BEEP O BEEP output terminal
10 REMO I Remote control input
11,12 Not used O Destination other than E and E2
13 L CE O CE output terminal for LCD driver
14,15 Not used O Non variable illumination switch destination

EJECT KEY ILL, GUIDE ILL, FLIP-DET “H” and PANEL-DET is “L” : “H” / “L”

16 DSI I/O

DSI control terminal FLIP-DET “H” and PANEL-DET is “H” : “L”
17 DIM CON O Dimmer control terminal 50ms interval : “H” / “L”
18 TEST ­19 ILL CON O During FLIP DET ILL+B OFF During FLIP DET “L” : H
20 VOL A I Volume key input When looking at VOL, also look at FLIPDET
21 VOL B I Volume key input When looking at VOL, also look at FLIPDET
22 MOSW O CD mechanism MOTOR IC SW Loading, Eject, Brake : H
23 LO/EJ I/O CD mechanism LOADING, EJECT switching STOP, Brake : Hi-Z, Loading : L, Eject : H
24 M STOP O STOP request to CD mechanism
25 M RST O Reset output terminal to CD mechanism Normal : H, Reset : L
26 MUTE I/O MUTE terminal Hi-Z : Mute ON, L : Mute OFF
27 LOE/LIM SW I CD DOWN SW DET terminal H : Chucking
28 M-MUTE L I MUTE request terminal from CD mechanism L : Mute request
29 M-MUTE R I MUTE request terminal from CD mechanism L : Mute request
30 PANEL 5V I/O Panel 5V control terminal
31 RESET I Normal : H, Reset : L
32 XT1 I 32kHz
33 XT2 I 32kHz
34 REGC - Connect 1µF condenser to GND
35 X2 I 20MHz
36 X1 I 20MHz
37 VSS ­38 VDD ­39 CLKOUT -

Truth

Processing Operation Description

value table

Panel DET : L, Detached, Momentary power down : H

4

EZ500

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

40 IC2 TYPE1 I E-VOL setting switching terminal
41 IC2 TYPE0 I E-VOL setting switching terminal
42~44
45
46 SW5V I/O Control terminal for SW5V ON : L, OFF : Hi-Z
47,48
49~51
52 B.U-DET I Momentary power down DET terminal
53 ACC-DET I ACC DET terminal ACC DET : L, ACC no DET : H
54 DIMMER I Small DET terminal ON : L, OFF : H
55 BVDD ­56 BVSS ­57
58 (SVR) O POWER IC SVR control terminal Momentary power down : H
59 P-MUTE O POWER IC MUTE output terminal
60 P-STBY O POWER IC STBY output terminal When POWER IC ON : H, OFF : L
61 Not used O

62

63

64 AFS O Constant switching terminal at noise DET
65 O-DATA I/O Not used
66 O-CLK I/O Not used
67 O-CE I/O Not used

68 LX_RST O Reset output to external devices

69 LX_CON O Control output to external devices ON : H, OFF : L
70 AVCONT O AD reference voltage control output While in operation : H
71 AVDD ­72 AVSS ­73 AVREF - AD reference voltage control input Connect to 70 pin

74 PHONE I PHONE DET terminal

75 TYPE3 I Destination switching terminal
76~81 Not used I
82 S-METER I S-meter DET terminal
83 NOISE I FM noise DET terminal
84 IFC-OUT I F/E IFC OUT input terminal

TYPE2~TYPE0
CD MECHA+B

PS2-0, PS2-1
PS1-0~PS1-2

EXT AMP CON

PRE MUTE R

PRE MUTE L

I Destination switching terminal e

I/O Power supply control terminal for MP3 ON : L, OFF : Hi-Z

O Control terminal for power supply IC w
O Control terminal for power supply IC q

O

O Rch PRE MUTE output

O Lch PRE MUTE output

Truth

value table

BU DET : L, BU no DET (momentary power down) : H

During POWER OFF : L, During ALL OFF : L, When TEL MUTE : L

When momentary power down : L,
M-MUTE R : L (during CD), 2 zone : H fixed
When momentary power down : L,
M-MUTE L : L (during CD), 2 zone : H fixed
During FM seek and AF search : L, During reception : H

Normally : L,
System RST return, then after 400msec or more : H then L

TEL MUTE : 1V or lower,
NAVI MUTE : 2.5V or higher

Processing Operation Description

5

EZ500

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

85 LX_MUTE I MUTE request from external devices H : MUTE ON, L : MUTE OFF
86 LX_REQ_M O Request output to external devices Request DET : L
87 Not used O Non RDS destination Output L fixed
88 LX_REQ_S I Request input from external devices Request DET : L
89 KEY-REQ I Communication request from LCD driver L : KEY input
90 LO.S SW I Loading start SW DET terminal Loading start : L

12cm DISC EJECT position DET SW terminal
91 12EJE SW I

12 or 8cm DET
92 EJECT I EJECT DET terminal L : KEY input
93 Not used O Output L fixed
94 LX_DATA_S I DATA input terminal from external devices
95 LX_DATA_M O DATA output terminal for external devices Last retention
96 LX_CLK I/O CLK input/output terminal with external devices
97 L DATAL I Data input from LCD driver
98 L DATAS O DATA output terminal to LCD driver
99 L CLK O CLK output terminal to LCD driver
100 PLL DATA I/O DATA input/output terminal with F/E

Truth

value table

12cm DISC : L

Processing Operation Description

Truth value table

q

PS1-0 PS1-1 PS1-2 AUDIO P-CON P-ANT

LLLOFF OFF OFF

H (L) L (H) L ON OFF OFF

HHLONONOFF
HHHONONON

w

PS2-0 PS2-1 ILLUMI FM+B AM+B

LLOFF OFF OFF

H (L) L (H) ON ON OFF

HHONOFF ON

e

MODEL

KDC-X579 K L L L
EZ500 K L L L
KDC-MP425 K H L L
KDC-MPV525 K L H L
KDC-MPV5025 K L L L
KDC-WV6027 E H L H
KDC-W6027 E L L H
KDC-W6027Y E L L H
KDC-MPV7026 M H H L
KDC-MP6026 M L H H

DESTINATION

012

TYPE

6

TEST MODE

EZ500

1. How to enter the test mode

• While holding the Preset 1 and Preset 3 keys, reset the unit.

2. How to exit from the test mode

• Reset the unit, ACC OFF, Power OFF, and Panel detached.

• (Note) The test mode cannot terminated by momentary
power down.

3. Initial status in the test mode

• Sources :All OFF

•Display :All segments are lit

•Volume :-10 dB (displayed as 30)

• Loudness :OFF

• CRSC :OFF regardless of the presence

of switching function

• SYSTEM Q : Flat.

• BEEP :When pressing any keys, the

buzzer generates a beep at any time

•AUX : ON

• MENU SYSTEM Q : OFF

•Variable model : Default is white

4. Special display in Tuner mode

When any of the following messages is displa yed in Tuner
mode, the front end may be abnormal.

• “TNE2P NG” : The EEPROM is set to the def ault (unstab le
values) because the F/E was shipped without passing
through the adjustment process, etc.

• “TNCON NG” : Communication with the F/E is not pos­sible.

5. Forced switching of K3I

• Each press of the Preset 6 key in Tuner mode should switch
K3I from AUT O → Forced Wide → Forced Middle → Forced
Narrow → AUTO. The initial status is AUTO and the dis­play shows these modes as follows.

•AUTO:FMA

•Forced Wide :FMW

•Forced Middle : FMM

•Forced Narrow: FMN

6. CD Receiver Test Mode Specification

• When resetting to start, forced ejection of CD is prohib­ited. When a CD is in place, the CD is not recognized
when reset.

• When the Track up key is pressed, the mechanism jumps
to the following trac k.

No.9 → No.15 → No.10 → No.11 → No.12 → No.13 →
No.22 → No.14 → No.9 (Return to the first track.)

• When the Track down key is pressed, the track goes down
by one from the currently played track.

• When the number of total tracks of the MP3 disc is less
than 9, 1st track is played.

• When a CD being played, by pressing Preset 1 key inter­mittently, the mechanism can be made to jump to Track
No. 28.

7. Audio-related specifications

•A short press of the Q key initiates the audio adjustment
mode.

• Pressing the ✽ key on the remote controller initiates the
audio adjustment mode.

•Fader is selected to the initial item.

•Continuous holding of a remote controller key is inhibited,
and workings are short press of any keys.

• Bass, Middle and Treble are adjusted in 3 steps of -8 / 0 /
+8 with the Track Up/Down keys (Default : 0).

• Balance is adjusted in 3 steps of L15 / 0 / R15 with the
Track Up/Down keys (Default : 0).

•Fader is adjusted in 3 steps of R15 / 0 /L15 with the Track
Up/Down keys (Default : 0).

• HPF is adjusted in 2 steps of OFF / 170Hz with the Track
Up/Down keys (Default : OFF).

• LPF is adjusted in 2 steps of OFF / 120Hz with the Track
Up/Down keys (Default : OFF).

• Bass f, Bass Q, Bass EXT, Middle f, Middle Q and Treble f
are not dealt with by the audio adjust.

8. Menu-related specifications

•A short press of the PLAY/PAUSE key initiates the Menu
mode.

• Pressing the DNPP key on the remote controller initiates
the Menu mode.

•Continuous holding of a remote controller key is inhibited,
and workings are short press of any keys.

• Contrast is adjusted in 3 steps of 0 / 5 / 10 with the Track
Up/Down keys (Default : 5).

9. Backup current measurement

•When the unit is reset while ACC is OFF (i.e. by turning
Back-Up ON), the MUTE terminal goes OFF in 2 seconds
in place of 15 second. (The CD mechanism is not acti­vated at this time.)

7

EZ500

TEST MODE

10. Special display when the display is All ON

Pressing the Preset keys while the power is All OFF dis­plays the following information.

1 key Version display (8 digits, Month/Day/Hour/Minute)

(Display) SYS xxxxxxxx

2 key Serial number display (8 digits)

(Display) SNo xxxxxxxx

3 key Short press : View power ON time.

(The All OFF period is not counted.)
2 seconds long press : Clear power ON time.
(Display) PonTim xxxxx Max. 60000 (hours)

4 key Short press : Display CD operation time.

2 seconds long press : Clear CD operation time.
(Display) CDTim xxxxx Max. 60000 (hours)

5 key Short press : Display CD ejection count.

2 seconds long press : Clear CD ejection count.
(Display) EjeCnt xxxxx Max. 60000 (times)

6 key Short press : Display Panel open/close count.

2 seconds long press : Clear Panel open/close count.
(Display) PnCnt xxxxxx Max. 600000 (times)

FM key Display ROM collection version.

(Display) ROM Rxxx Invalid : ROM R– – –

11. Other specifications

• Only during the changer operation, two-zone ON/OFF is
achieved by pressing Preset 1 key. When ON, P/S dot is
turned on all the time.

• No displays such as “CODE OFF/ON” during power ON.

• The line mute against times are 1 second from 10 sec­onds when starting the test mode.

• OEM display output is not stop if OEM display not connec­tion on the test mode.

12. Switching the frequency span (K/M type)

• While holding the Preset 1 key and Preset 5 ke y, reset the
unit.

13. OEM compatible setting
(Electronic volume destination setting)

• Models equipped with S03F/E can become OEM model
compatible by using the No. 2 pin of the microcomputer.
The setting methods are shown below. For actual data
values, please refer to the Application Document IC2V-05.

IC2-TYPE0 IC2-TYPE1

(41 pin) (40 pin)

Low Low q Model on the market (default)
Low High w

High Low e
High High

Model on the market CRSC changed

OEM model compatible CRSC changed
r OEM model compatible CRSC and
de-emphasis changed

Contents

8

14. Security

• Forced Power ON mode (All models)

Even when the security (Simple security and Code secu­rity) is approved, resetting the unit while holding the Q key
and Preset 4 key makes it possible to turn the power ON
for 30 minutes. After 30 minutes have elapsed, it is not
possible to return to the previous condition unless the unit
is reset again. (Security code is doing not clear at this
mode. Put the power on fill-in.)

• Method of registration of the security code after
EEPROM (F/E) replacement (Code security model)

1. Enter the test mode. (See How to enter the test mode)

2. Press the MENU key to enter the MENU.

3. When the message “Security” is displayed, press and
hold the Track up/down keys for 1second to enter the
Security registration mode.

4. Enter the code using the FM/AM/Track up/Track down
keys.

• FM key : Number up

• AM key : Number down

•Track up key : Cursor right shift

•Track down key : Cursor left shift

5. Hold down the Track up key for at least 3 seconds and
the message, “RE-ENTER” appears , so once again en­ter the code according to Step 4 above.

6. Press and hold the Track up key for 3 seconds until “AP­PROVED” is displayed.

7. Exit from the test mode. (See How to exit from the test
mode)
(Note) All Clear is not applicable to the security code of
this model.

•

Method of clearing the simple security code (K type)

1. While the code entry is requested, press and hold the
Track up key for 3 seconds while holding the AUTO key
pressed. (– – – – will dissappear.)

2. Enter “KCAR” from the remote controller.

• Press the 5 key on the remotecontroller twice, then

press the Track up key. (This enters “K”)

• Press the 2 key on the remote controller 3 times, then

press the Track up key. (This enters “C”)

• Press the 2 key on the remote controller once, then

press the Track up key. (This enters “A”)

• Press the 7 key on the remote controller twice, then

press the Track up key. (This enters “R”)

3. Security function is canceled and the unit enters the All
OFF mode.

4. If you commit a mistake in the code entry, the unit en­ters the code request mode.

EDCBA

EZ500

PC BOARD
(COMPONENT SIDE VIEW) (FOIL SIDE VIEW)

SWITCH UNIT
X16-2960-10 (J76-0036-12)

AUTO

S2

S13

S11

S10

S7

SRC

ATT

VOLUME

S1

1

D1

ED1

73

SWITCH UNIT
X16-2960-10 (J76-0036-12)

D24

D23

R22

R21

D22

CP1

C11
C10

VOL A

VOL B

DI

ILL+B

R23

2

FLIP DET

16

CE

DO

CL

CP2

1

J1

15

PANEL 5V

RESET

KI3

KS4

ESD-GND

KI5

REMO

R11

1

2

3

4

AM

S9

S5

33

S6

564321

S4

S14

S8

RESET

FM

D2

C12

C13

AUTO

S15

34

25

R33

26

R32

Q5

DIMMER

R31

EB

R9

D3

X16-2960-10

Ref. No. Address

IC2 7A

IC2

1

3

S12

DISP

S3

2

4

Q4

DGND+ILL GND

EB

R14

EB

Q3

KI4

R12

R25

C1

R7

R6

R1

1

100

IC1

51

50

D28

D27

D26

KI2

KS2

C3

R2

C4

C2

R5

R4

R3

R16

76

CP4

KI1

C6

Q2

EB

D25

75

CP3

R8

D21

5

6

X16-2960-10

D29

KS3

KS5

R24

C7

R10

Ref. No. Address

IC1 5D

Q2 6D
Q3 7C
Q4 6C
Q5 6C

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

7

9

F G H I J

8

R422

R54

C4

R

4

5

2

EZ500

1

PC BOARD (COMPONENT SIDE VIEW)

ELECTRIC UNIT X34-3080-14 (J74-1447-42)

W2

2

J3

R355

R351

EB

Q351

Q355

BE

R361R359
R362

R360

BE

R376

R377

EB

Q357

C355

C359

R356

R352

Q356

EB

R358

BE

Q352

Q358

C354

C358

C352

D308

D307

W1

Q350

C353

R357

C351

3

CN3

CN4

R363

1

R364
3
4

6

C360
R373

J4

L3

4

A1

1

J2

13 11 12 8 4 3 2
91067 5 1

C301

D309

D311

D310

BE

BE

Q354

D205 D204

CN6

3

D352

1

D351

W104

W101

W103

C211

L10

C302

C303

D301

D303
D304

224

125

TH1

C256

C255

C254

Q201

BE

W106

W105

D358

D357

D356

5

C221

L6

C220

L7

L8

CN5

L9

C116

24

6

C117 C115

C118

18

IC7

C216

1
2

R215

C222C224
R214R216

C223C225

C217

R211

R212

R213

R113
R112
R114

C219

C226
C227

C218

C210

C208

C207

D161

22

23

IC2

33

34

C209

D154

R203

C212

12

11

1

44

C202 C201

D153 D158

W3

IC4

W4
W5

R262/W204

R259/W201

R261/W203

D203

R204

R260/W202

C251 C252 C253

R253

R402
R403
R404
R406

R104

R102

R401
R405

R153

C213

R254

R152

CN2

23 1

24 2

C304

R154

R105

R103

R315
R407

R207
R208

R210

W6

C257

/W205

D270

C33

76

100

R209

D269

75

D252

R257

C258

D32

D271

Q31

EB

C32

41

IC10

R372

R371

R370

IC1

R163

R151

R155

R156

W7

D254

C7

R169

W8

85

R8

R34

R35

SDA

R158

D257

R37

R33

7

8

SCL

R36

C403

R60

R157

R31

D256

C31
R32

R9

51

50

26

251

R59

IC6

R56

R55

J1

D25

D31

D4
D2

D

R408

R2

R58

BU

C

R409

S1

169

X3

C502

P1

D162

D156D155D160D159D152

2

117

CN1

D157D151

18

D163 D

7

10