Kenwood KDC-138, KDC-138-CR, KDC-139-S, KDC-139 Service manual

CD RECEIVER

KDC-138/138CR KDC-139/139S

SERVICE MANUAL

Panel assy KDC-138 (A64-4276-02)

Panel assy KDC-139 KDC-139S (A64-4287-02)

(A64-4286-02)

Mounting hardware assy (J21-9716-03)

KDC-138

KDC-139

Panel assy KDC-138CR (A64-4277-02)

TDF SPARE-PANEL

MAIN UNIT NAME TDF PARTS No. TDF NAME KDC-138 Y33-2830-63 TDF-81D KDC-138CR Y33-2830-64 TDF-81DCR KDC-139 Y33-2820-65 TDF-139

KDC-139S Y33-2820-66 TDF-139S

* Plastic cabinet assy (A02-2736-03)

KDC-138CR

* Carrying case (W01-1692-05)

DC cord (E30-6415-15)

* Depends on the model. Refer to the parts list.

* Escutcheon (B07-xxxx-xx)

Lever (D10-4589-04) x2

This product complies with the

Screw set (N99-1757-05)

Screw (4x16) (N84-4016-48)

This product uses Lead Free solder.

RoHS directive for the European market.

KDC-138/138CR/139/139S

BLOCK DIAGRAM

ELECTRIC UNIT (X34- )

TUNER FRONT-END

IC1

ANT.

IC8

BU5

RESET IC

to GND

PANEL DET

RESET

IC2

REMOTE

SWITCH UNIT (X16- )

AM+B A8V SW5

IC2 or IC3

A8V

ROM CORRECTION (NOT USED)

F-AUX

ROTARY ENCODER

IC10

SW5

E2PROMSW5

SYSTEM u-COM

SW5

E-VOL

111

Q301

PAN5V

SERVO+B

BU5

A8V

DRIVER

IC1

LCD

DME1

MUTE

ILLUMI+B

CD MECHA

KEY ILLUMI

KEY MATRIX

ED1

BU5

LED

IC6

Q701,702

PRE-OUT MUTE

BU5 BU5

DC-CN etc

PHONE ACC DET / BU DET P.ON FL PS1-1 / PS1-2 / PS1-3 PS2-1 / PS2-2

POWER IC

Q705

MUTE

Q901-903

DC-DET

BU DET

RST

PRE-OUT

REAR/SW

PS1 1 / PS1 2 / PS1 3 PS2 1 / PS2 2

SERVO+B

PHONE

ACC DET

BU DET

FL+B

AM+B

SW5

A8V

SW5

BU5

R103

PHONE

Q101

ACC-DET

Q103

BU-DET

Q102

SURGEDET

IC4

POWER SUPPLY IC

CD SERVO

BU5

DC-CN

PHONE

SP-OUT

ACC B.U.

P-ANT P-CON

DPU1

FO COIL

TR COIL

DM1

SPINDLE MOTOR

DM2

LOADING & SLED MOTOR

CD PLAYER UNIT (X32-598x-xx)

IC1

D.GND

APC

IC6

FO OUT

TR OUT

MOTOR DRIVER

DM OUT

FM OUT

VREF

S.GND

A,B,C,E,F

FOD,TRD,

TVD,SPL

1 CHIP IC RF AMP

+ SERVO PROCESSOR

+ MICRO

PROCESSOR

VREF

DMUTE

X1 or X2

CLOCK

16.93MHz

RST

MSTOP

CLK

DATA

AVDD

IOVDD

P-ON1

REGVDD

D.GND

LEVEL SHIFT

IC3

3.3V REG

Q8,9

3.3V SW

LEVEL SHIFT

(0-00),(0-01) ONLY

8V SW

(0-00),(0-01) ONLY

IC2

3.3V REG

(0-01),(0-03) ONLY

D.GND

S.GND

MOTHER BOARD (X34- )

MRST

MSTOP

CLK

DATA

MUTE

L-ch R-ch

A.GND

AS8V

D.GND

BU5V

S7V

8EJE-SW

LOE/LIM-SW

12EJE-SW

LOS-SW

S.GND

LO/EJ MOTOR

KDC-138/138CR/139/139S

COMPONENTS DESCRIPTION

ELECTRIC UNIT (X34-564x-xx)

●

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

IC1 System µ-COM Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.

IC2,3 E-VOL Controls the source, volume and tone.

IC4 Power Supply IC Outputs 5Vx2, 8.1Vx2, 10.2V, P-CON and P-ANT.

IC6 Power IC Ampliﬁ es the front L/R and the rear L/R to 50W or 45W maximum.

IC8 Reset IC Lo when detection voltage goes below 3.6V.

Q2 Servo+B AVR When Q3’s base goes Hi, Servo+B AVR outputs 7.5V.

Q3 Control SW for Servo+B ON when the base goes Hi.

Q11 14V SW ON when the base goes Hi.

Q12 14V SW ON when the base goes Lo.

Q13 Control SW for IC4 ON when the base goes Hi.

Q14 Control SW for IC4 ON when the base goes Lo.

Q101 ACC DET ON when the base goes Hi during ACC is applied.

Q102 Serge DET When the base goes Hi, surge voltage is detected.

Q103 BU DET ON when the base goes Hi during BU is applied.

Q104,105 Mute Control ON when the base goes Hi.

Q301 Panel 5V SW ON when the base goes Lo.

Q402 Quick Charge Voltage SW Charges voltage quickly when the base goes Hi.

Q701,702 Pre-out Mute SW When a base of the 4 transistors goes Hi, pre-out is muted.

Q705 Mute Driver for Pre-out ON when the base goes Lo.

Q801

Q901 DC Offset DET ON when the base goes Hi after Q902’s and Q903’s outputs are separated.

Q902,903 DC Offset DET SW ON when the bases go Lo after IC6’s SP-OUTs (DC) are separated.

Electric Discharge Circuit for C805 (SVR)

ON when the base goes Lo.

SWITCH UNIT (X16-616x-xx)

●

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

IC1 LCD Driver

IC2 Remote Control Sensor

CD PLAYER UNIT (X32-5980-04)

●

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

Focusing, tracking, sled and spindle servo processing.

Automatic adjustment (focusing, tracking, gain, offset and balance) operations.

CD Signal Processor

IC1

IC2 3.3V REG Supplies 3.3V to IC1 and the laser pick-up.

IC6 4ch BTL Driver Focusing and tracking coil, sled and spindle motor driver, disc loading and eject operation.

& MECHA µ-COM

RF Ampliﬁ er responding

to CD-RW

Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data

interpolation processing) operations, and microcomputer function.

Generation of RF signal based on the signals from the APC circuit and the laser pick-up,

and generation of servo error (focusing error and tracking error) signals.

Detection of dropout, anti-shock, track crossing and off-tracking conditions, included gain

control function during CD-RW.

KDC-138/138CR/139/139S

COMPONENTS DESCRIPTION

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

Q3 5V-3.3V Level Shift Shifts 5V to 3.3V, or 3.3V to 5V.

Q4 5V-3.3V Level Shift Shifts 3.3V to 5V.

Q6 BU3.3V SW Q6 is ON when Q8 or Q9 is ON.

Q7 APC (Auto Power Control) Drives LD (Laser Diode).

Q8 Power Supply Control Power Supply Control from MECHA µ-COM. Q6 is ON when pin 63 (P_ON1) of IC1 is Hi.

Q9 Power Supply Control Power Supply Control from system µ-COM. Q6 is ON when pin 125 (MSTOP) of IC1 is Hi.

D1,2 5V Force Voltage Prevention 5V Force Voltage Prevention from MECHA µ-COM side.

D3 Laser Diode Protection Prevents reverse bias which is applied to laser. Laser destruction prevention.

D4 Static Electricity Countermeasure Prevents malfunction by static electricity.

KDC-138/138CR/139/139S

MICROCOMPUTER’S TERMINAL DESCRIPTION

SYSTEM µ-COM: IC1 on X34- (ELECTRIC UNIT)

●

Pin No. Pin Name I/O Application

1 LX DATA M I/O Data to slave unit Pull-down (GND)

2 LX CLK I/O LX-BUS clock 125k~65kHz

3~5 NC - Not used Output L ﬁ xed

6 REMO I Remote control signal input Detects pulse width

7 NC - Not used Output L ﬁ xed

8 BYTE - Memory extended bus width setting Connects to VSS

9 CNVSS - Connects to VSS

10 XCIN - 32.768kHz

11 XCOUT - 32.768kHz

12 RESET

13 XOUT - 10.0MHz

14 VSS -

15 XIN - 10.0MHz

16 VCC1 -

17 NMI I Connects to VCC

18 PANEL DET

19,20 NC - Not used Output L ﬁ xed

22,23 NC - Not used Output L ﬁ xed

24 PON FL - Not used Output L ﬁ xed

25 NC - Not used Output L ﬁ xed

26 PON PANEL I/O Panel 5V control

27,28 NC - Not used Output L ﬁ xed

29 AUD SCL I/O E-VOL clock output

30 AUD SDA I/O E-VOL data input/output

33 VFD CLK O LCD clock output 125kHz

34 VFD BLK - Not used Output L ﬁ xed

35 CD DATA I/O CD mechanism I2C data input/output

36 CD CLK I/O CD mechanism I2C clock output

37 NC - Not used Output L ﬁ xed

38 CD LOS SW I CD loading detection

39 PIO0 I

40 CD MSTOP O CD mechanism µ-com stop

41 EPM I Flash EPM input Connects to VSS

43 PON CD - Not used

ROMCOR DET

VFD SYS DATA

VFD PAN DATA

CD LOE LIM SW

- L: Reset

I Panel communication detection H: Panel detached, L: Panel attached

I E2PROM writing request H: Writing

O LCD data output

I LCD data input

Communication request from mechanism DSP

I CD detection (Chucking SW) H: Loading completed, L: No disc

Truth Value

Tab le

Processing Operation Description

ON: L, Momentary power down/Panel detached:

Hi-Z, 11 minutes after ACC OFF: Hi-Z

H: Data request

H: Mechanism µ-com operates,

L: Mechanism µ-com stops

KDC-138/138CR/139/139S

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

44 CD LOEJ I/O CD motor control

45 CD MOTOR I/O CD motor control

46 VFD CE O LCD control request

48 CD CCE O CD mechanism chip enable

49 NC I Not used

50 CD MRST O CD mechanism µ-com reset H: Normal, L: Reset

51~53 NC - Not used Output L ﬁ xed

54 CD MUTE I CD mute request L: Mute request

56 ROTARY CCW I VOL key input Detects pulse width

57 ROTARY CW I VOL key input Detects pulse width

58~61 NC - Not used Output L ﬁ xed

62 VCC2 -

63 NC - Not used Output L ﬁ xed

64 VSS -

65 NC - Not used

66 TUN IFC OUT I Front-end IFC-OUT input H: Station found, L: No station

68 MUTE I/O Mute L: Mute OFF, Hi-Z: Mute ON

70 LX RST O Forced reset to slave unit H: Reset, L: Normal

71 LX CON O Start-up request to slave unit H: Slave unit ON, L: Slave unit OFF

72 LX MUTE I Mute request from slave unit H: Mute ON, L: Mute OFF

73 LX REQ M O Communication request to slave unit

74 NC - Not used

75 LX REQ S I Communication request from slave unit Pull-down (GND)

76 PWIC SVR O SVR discharging circuit

77 PWIC STBY O Power IC standby control Power ON: H, Power OFF: L

78 PWIC MUTE O Power IC mute

79 ACC DET

80 BU DET

81~83 NC - Not used Output L ﬁ xed

84 TUN SMETER I S-meter input

85 TYPE1 I Destination switching

CD DRIVEMUTE

CD DISC12 SW

PON EXT GND

ANALOG CON

O Motor driver mute output

I 12cm disc detection Pull-up (B.U.)

I/O IC2 external input quick charge control

O AUX/LX audio switching

I ACC power supply detection ACC found: L, No ACC: H

I Detection of momentary power down

Truth Value

Tab le

Processing Operation Description

Refer to the truth value table

L: OFF, Hi-Z: Quick charge, When IC2 is in source select:

Hi-Z, Mute L: L, Momentary power down/Power OFF: L

AUX: H (Switches after 100ms after ﬁ rst-out mute

begins to work), LX/Other source: L

During 500ms after power OFF and momentary

power down: H, Since then: L

STANDBY source/Momentary power down: L,

TEL mute: L

BU found: L, No BU/Momentary power down: H

(Operates after less than 4ms after momentary

power down is detected)

Refer to the truth value table

KDC-138/138CR/139/139S

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

86 TYPE2 I Destination switching

88 LINE MUTE I Line mute detection TEL mute: Below 1V, NAVI mue: Over 2.5V

89 OFFSET DET I Power IC offset detection

90 PS2 2 O Power supply IC control

91 PS2 1 O Power supply IC control

92 PS1 1 O Power supply IC control

93 PS1 2 O Power supply IC control

94 PS1 3 O Power supply IC control

95 NC - Not used Output L ﬁ xed

96 AVSS -

97 REF CON O VREF control Connects to VREF

98 VREF -

99 AVCC -

100 LX DATA S I Data from slave unit Pull-down (GND)

PWIC DC DET

I DC offset detection

Truth Value

Tab le

Processing Operation Description

Refer to the truth value table

If DC offset is found 20 times in 100ms with condition

of over 1.0V, it will be judged as DC offset detected.

Refer to the truth value table

• Truth value table

CD motor control

CD motor CD loading/eject

Stop L L

Load H L

Eject H H

Brake H Hi-z

Destination switching

TYPE 2

(Pin 86)

0V 0V KDC-135

0V 2.4V KDC-135CR

1.2V 0V KDC-136

TYPE 1

(Pin 85)

Model

Power supply IC (IC4) control

SEL1 (Pin 10)

PS1-2 PS1-3 PS2-1 ILLUMI P-CON P-ANT

L L L OFF OFF OFF

L L H ON OFF OFF

H L H ON ON OFF

H H H ON ON ON

SEL2 (Pin 11)

PS1-1 PS2-2

L L OFF OFF

H L ON OFF

H H ON ON

AUDIO/SW5

KDC-138/138CR/139/139S

TEST MODE

Example

■

Key Description of display Description

Disc EJECT times display

■

A symbol “■” in the key column indicates that the key should be pressed and held for 1 second or longer.

How to enter the test mode

■

Procedure Note

Press and hold the [1] key and [3] key and reset.

EJ CXXXXX

Disc EJECT times display. MAX 65535 (times)

While disc EJECT times is displayed, press and hold for

2 seconds or longer to clear disc EJECT times.

All lamps blink when it is detected that the sub-clock resonator is disconnected.

When having started up in the test mode, change the LINE MUTE inhibition time from 10 seconds to 1 second.

When operating in the test mode, even if a DC offset error occurs, detection information is not written in the E2PROM.

Forced disc ejection is prohibited in the test mode.

How to clear the test mode

■

Procedure Note

Reset, momentary power down, ACC OFF, Power OFF, Panel detached. Clearing the test mode

Test mode default condition

■

Description Default values

Source STANDBY

Display Display lights are all turned on.

Volume -10dB (“30” is displayed.)

Bass Boost OFF

CRSC OFF regardless of having/not having the switching function.

AUX ON (Only model equipped with AUX)

System Q NATURAL (FLAT)

Preout Rear

KDC-138/138CR/139/139S

TEST MODE

Special displays when all lights are on in STANDBY source

■

Key Description of display Description

Common

■

All lights ON. All lights ON.

Destination terminal

condition indication

Development ID

condition indication

2 Serial No. display

Power ON time display

■

Disc operation time display

■

Disc EJECT times display

■

Panel open/close

times display

■

ROM correction version

display

AM ROM data transfer

■

Audio data initialization

Forced Power OFF

information display

CD information display

mode ON/OFF

■

5:00701K

00000000

Pon 0HXX

Po nXXXXX

PLy 0HXX

PL y XXXXX

EJ CXXXXX

PC XXXXX

POFF –––

POF F Pn L

TP11

0123

––––

oooo

InIT

“TYPE” indicates system µ-com (IC1) destination, and shows

real-time condition of the destination terminal.

Development ID – Version (system µ-com: IC1)

Serial No. is displayed (8 digits)

00~50 is displayed for “XX”. When less than 1 hour,

displayed by displayed by increments of 10 minutes.

00001~10922 is displayed for “XXXXX”. MAX 10922 (hours)

When Power ON time is displayed, press and hold for

2 seconds or longer to clear Power ON time.

00~50 is displayed for “XX”. When less than 1 hour,

displayed by increments of 10 minutes.

00001~10922 is displayed for “XXXXX”. MAX 10922 (hours)

While the disc operation time is displayed, press and hold for

2 seconds or longer to clear the disc operation time.

(Cleared only for displayed media.)

Disc EJECT times display. MAX 65535 (times)

While disc EJECT times is displayed, press and hold for

2 seconds or longer to clear disc EJECT times.

PANEL open/close times display. MAX 65535 (times)

Press the key for more than 2 seconds while the PANEL open/

close count is displayed and PANEL open/close count is cleared.

The number is the ROM correction version number.

When E2PROM is not installed.

When not written in yet.

When data not matched. (due to the difference in versions)

AUDIO setting value is re-set to the test mode default value.

No forced power OFF

Forced power OFF by communication error between system

µ-com and panel.

While the forced power OFF data is displayed, press and

hold for 2 seconds to clear the data.

For the display contents, refer to “CD information display

mode” in the next section.

While in CD information display mode, press and hold for

2 seconds or longer to clear all CD information.

KDC-138/138CR/139/139S

TEST MODE

• CD information display mode

Key Description of display Description

(forward

rotation)

(reverse

rotation)

I2C communication status

CD mecha-

nism error

log display

CD Load

error

information

display

CD Ejection

error

information

display

CD time code

error count

data display

(Missing

counts)

CD time code

error count

data display

(count not

updated)

1:X X M – E R

2:X X M – E R

3:X X M – E R

1:X X L D E R

2:X X L D E R

1:XXEJER

2:XXEJER

3:XXEJER

4:XXEJER

:XXCDDA

ICOK

ICER

LOSE

STAY

I2C communication OK

I2C communication NG

Mechanism error log 1 (Latest)

XX: Error number. “– –” is displayed in case there is no error.

Mechanism error log 2 (Latest)

XX: Error number. “– –” is displayed in case there is no error.

Mechanism error log 3 (Latest)

XX: Error number. “– –” is displayed in case there is no error.

Load error switch 1