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

CD RECEIVER

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

SERVICE MANUAL

© 2007-9 PRINTED IN JAPAN B53-0577-00 (N) 373

Panel assy	Panel assy
KDC-138 (A64-4276-02)	KDC-138CR (A64-4277-02)
KDC-138	KDC-138CR

Panel assy
KDC-139 (A64-4286-02)
KDC-139S (A64-4287-02)	TDF SPARE-PANEL
	MAIN UNIT NAME	TDF PARTS No.	TDF NAME
KDC-139	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
Mounting hardware assy	* Plastic cabinet assy	* Carrying case
(J21-9716-03)	(A02-2736-03)	(W01-1692-05)

DC cord	* Escutcheon	Lever	Screw set	Screw (4x16)
(E30-6415-15)	(B07-xxxx-xx)	(D10-4589-04) x2	(N99-1757-05)	(N84-4016-48)

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

This product uses Lead Free solder.

This product complies with the RoHS directive for the European market.

KDC-138/138CR/139/139S

BLOCK DIAGRAM

ELECTRIC UNIT (X34- )

J2	ANT.					Q901-903
A1			DME1
	AM+B	BU				DC-DET
TUNER			CD		BU		R103
	A8V	A8V						BU5
FRONT-END			MECHA		IC6	PHONE	PHONE
	SW5	SERVO+B
			16	2	POWER		Q101
3					IC

1

ACC DET

ACC-DET

Q103

BU5

BU DET

BU-DET

IC2 or IC3

J1

Q102

1

Q701,702

J5

DC-CN

E-VOL

MUTE

SURGE-

PHONE

A8V

PRE-OUT

PRE-OUT

DET

ROM CORRECTION (NOT USED)

MUTE

REAR/SW

SP-OUT

IC4

IC10

ACC

BU5

SW5

E2PROM

PS1 1 / PS1 2 / PS1 3

B.U.

3

2

1

1

BU5

P-ANT

IC1

Q705

PS2 1 / PS2 2

P-CON

BU5

BU DET

FL+B

MUTE

RST

AM+B

SYSTEM u-COM

9

SW5

POWER

1

SUPPLY

A8V

IC

DC-CN etc

SW5

IC8

1

1

2

1

1

5

D5

PHONE

BU5

BU5

RESET IC

Q301

ACC DET / BU DET

P.ON FL

SW5

BU5

ILLUMI+B

PS1-1 / PS1-2 / PS1-3

SERVO+B

CD

PS2-1 / PS2-2

PAN5V

Q2

SERVO

J3

CN

to GND

J1

PANEL DET

IC1

ED1

S2

J2

S1

RESET

F-AUX

ROTARY

LCD

LED

ENCODER

DRIVER

SW5

KEY

ILLUMI

IC2

SW5

10

KEY

REMOTE

MATRIX

SWITCH UNIT (X16- )

CD PLAYER UNIT (X32-598x-xx)

MOTHER

DPU1

IC1

BOARD (X34- )

RST

MRST

D.GND

A,B,C,E,F

MSTOP

MSTOP

A

B

Q3

F

CLK

LEVEL SHIFT

CLK

E

LEVEL SHIFT Q3

C

Q7

1 CHIP IC

DATA

DATA

APC

RF AMP

Q4

LEVEL SHIFT

+

MUTE

SERVO

MUTE

PROCESSOR

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

+

IC6

L-ch

MICRO

R-ch

FO COIL

FO OUT

PROCESSOR

A.GND

TR COIL

TR OUT

AVDD

IC3

3.3V REG

8V SW

Q1

AS8V

VREF

VREF

MOTOR

FOD,TRD,

Q8,9 SW

Q2

(0-00),(0-01)

DM1

TVD,SPL

SW

ONLY

DRIVER

SPINDLE

DM OUT

DMUTE

D.GND

MOTOR

D.GND

Q6

IC2

DM2

IOVDD

3.3V SW

3.3V REG

BU5V

LOADING &

SLED

FM OUT

S7V

MOTOR

P-ON1

SW

(0-01),(0-03)

REGVDD

ONLY

S.GND

S4

8EJE-SW

X1 or

D.GND

X2

S3

CLOCK

LOE/LIM-SW

16.93MHz

S2

12EJE-SW

S1

LOS-SW

D.GND

S.GND

S.GND

LO/EJ

MOTOR

2

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	Amplifies 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	Electric Discharge Circuit for C805 (SVR)	ON when the base goes Lo.
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.

● 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	Digital signal processing (DSP, PLL, sub-codes, CIRC error correction, audio data
	IC1	& MECHA µ-COM	interpolation processing) operations, and microcomputer function.
		RF Amplifier responding	Generation of RF signal based on the signals from the APC circuit and the laser pick-up,
		to CD-RW	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.
	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.

3

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.

4

KDC-138/138CR/139/139S

MICROCOMPUTER’S TERMINAL DESCRIPTION

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

Pin No.		Pin Name				I/O	Application	Truth Value	Processing Operation Description
								Table
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 fixed
6	REMO					I	Remote control signal input		Detects pulse width
7	NC					-	Not used		Output L fixed
8	BYTE					-	Memory extended bus width setting		Connects to VSS
9	CNVSS					-			Connects to VSS
10	XCIN					-	32.768kHz
11	XCOUT					-	32.768kHz
						-			L: Reset
12	RESET
13	XOUT					-	10.0MHz
14	VSS					-
15	XIN					-	10.0MHz
16	VCC1					-
17	NMI					I			Connects to VCC
						I	Panel communication detection		H: Panel detached, L: Panel attached
18	PANEL DET
19,20	NC					-	Not used		Output L fixed
21	ROMCOR DET					I	E2PROM writing request		H: Writing
22,23	NC					-	Not used		Output L fixed
24	PON FL					-	Not used		Output L fixed
25	NC					-	Not used		Output L fixed
									ON: L, Momentary power down/Panel detached:
26	PON PANEL					I/O	Panel 5V control
									Hi-Z, 11 minutes after ACC OFF: Hi-Z
27,28	NC					-	Not used		Output L fixed
29	AUD SCL					I/O	E-VOL clock output
30	AUD SDA					I/O	E-VOL data input/output
31	VFD SYS DATA					O	LCD data output
32	VFD PAN DATA					I	LCD data input
33	VFD CLK					O	LCD clock output		125kHz
34	VFD BLK					-	Not used		Output L fixed
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 fixed
38	CD LOS SW					I	CD loading detection
39	PIO0					I	Communication request from mechanism DSP		H: Data request
40	CD MSTOP					O	CD mechanism µ-com stop		H: Mechanism µ-com operates,
									L: Mechanism µ-com stops
41	EPM					I	Flash EPM input		Connects to VSS
42	CD LOE LIM SW					I	CD detection (Chucking SW)		H: Loading completed, L: No disc
43	PON CD					-	Not used

5

KDC-138/138CR/139/139S

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.		Pin Name			I/O	Application	Truth Value	Processing Operation Description
							Table
44		CD LOEJ			I/O	CD motor control	q	Refer to the truth value table
45		CD MOTOR			I/O	CD motor control	q	Refer to the truth value table
46		VFD CE			O	LCD control request
47		CD DRIVEMUTE			O	Motor driver mute output
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 fixed
54		CD MUTE			I	CD mute request		L: Mute request
55		CD DISC12 SW			I	12cm disc detection		Pull-up (B.U.)
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 fixed
62		VCC2			-
63		NC			-	Not used		Output L fixed
64		VSS			-
65		NC			-	Not used
66		TUN IFC OUT			I	Front-end IFC-OUT input		H: Station found, L: No station
67		PON EXT GND			I/O	IC2 external input quick charge control		L: OFF, Hi-Z: Quick charge, When IC2 is in source select:
								Hi-Z, Mute L: L, Momentary power down/Power OFF: L
68		MUTE			I/O	Mute		L: Mute OFF, Hi-Z: Mute ON
69		ANALOG CON			O	AUX/LX audio switching		AUX: H (Switches after 100ms after first-out mute
								begins to work), LX/Other source: L
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		During 500ms after power OFF and momentary
								power down: H, Since then: L
77		PWIC STBY			O	Power IC standby control		Power ON: H, Power OFF: L
78		PWIC MUTE			O	Power IC mute		STANDBY source/Momentary power down: L,
								TEL mute: L
					I	ACC power supply detection		ACC found: L, No ACC: H
79		ACC DET
								BU found: L, No BU/Momentary power down: H
					I	Detection of momentary power down		(Operates after less than 4ms after momentary
80		BU DET
								power down is detected)
81~83		NC			-	Not used		Output L fixed
84		TUN SMETER			I	S-meter input
85		TYPE1			I	Destination switching	e	Refer to the truth value table

6

KDC-138/138CR/139/139S

MICROCOMPUTER’S TERMINAL DESCRIPTION

	Pin No.	Pin Name	I/O	Application	Truth Value	Processing Operation Description
					Table
	86	TYPE2	I	Destination switching	e	Refer to the truth value table
	87	PWIC DC DET	I	DC offset detection		If DC offset is found 20 times in 100ms with condition
						of over 1.0V, it will be judged as DC offset detected.
	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	r	Refer to the truth value table
	91	PS2 1	O	Power supply IC control	r	Refer to the truth value table
	92	PS1 1	O	Power supply IC control	r	Refer to the truth value table
	93	PS1 2	O	Power supply IC control	r	Refer to the truth value table
	94	PS1 3	O	Power supply IC control	r	Refer to the truth value table
	95	NC	-	Not used		Output L fixed
	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)

• Truth value table

q CD motor control

	CD motor		CD loading/eject
Stop	L		L
Load	H		L
Eject	H		H
Brake	H		Hi-z
e Destination switching
TYPE 2	TYPE 1		Model
(Pin 86)	(Pin 85)
0V	0V		KDC-135
0V	2.4V		KDC-135CR
1.2V	0V		KDC-136

r 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	AUDIO/SW5	AM
L	L	OFF	OFF
H	L	ON	OFF
H	H	ON	ON

7

KDC-138/138CR/139/139S

TEST MODE

■ Example

Key	Description of display		Description
5		E J C X X X X X	Disc EJECT times display. MAX 65535 (times)
	Disc EJECT times display
■5			While disc EJECT times is displayed, press and hold for
			2 seconds or longer to clear disc EJECT times.
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.

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

8

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

T

P

1

1

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

condition indication

real-time condition of the destination terminal.

1

Development ID

5

: 0

0

7

0

1

K

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

condition indication

2

Serial No. display

0

0

0

0

0

0

0

0

Serial No. is displayed (8 digits)

P

o

n

0

H

X

X

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

3

displayed by displayed by increments of 10 minutes.

Power ON time display

P

o

n

X

X

X

X

X

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

■3

When Power ON time is displayed, press and hold for

2 seconds or longer to clear Power ON time.

P

L

y

0

H

X

X

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

4

displayed by increments of 10 minutes.

Disc operation time display

P

L

y

X

X

X

X

X

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

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

■4

2 seconds or longer to clear the disc operation time.

(Cleared only for displayed media.)

5

E

J

C

X

X

X

X

X

Disc EJECT times display. MAX 65535 (times)

Disc EJECT times display

■5

While disc EJECT times is displayed, press and hold for

2 seconds or longer to clear disc EJECT times.

6

Panel open/close

P

C

X

X

X

X

X

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

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

■6

times display

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

0

1

2

3

The number is the ROM correction version number.

FM

ROM correction version

E

R

When E2PROM is not installed.

display

–

–

–

–

When not written in yet.

o

o

o

o

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

■AM

ROM data transfer

Audio data initialization

I

n

I

T

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

P

O

F

F

–

–

–

No forced power OFF

Forced Power OFF

P

O

F

F

P

n

L

Forced power OFF by communication error between system

µ-com and panel.

information display

■

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

CD information display

mode” in the next section.

mode ON/OFF

■

While in CD information display mode, press and hold for

2 seconds or longer to clear all CD information.

9

KDC-138/138CR/139/139S

TEST MODE

• CD information display mode

Key

Description of display

Description

I2C com-

I

C

O

K

I2C communication OK

munication

I

C

E

R

I2C communication NG

status

1

: X

X

M

–

E

R

Mechanism error log 1 (Latest)

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

CD mecha-

/

Mechanism error log 2 (Latest)

nism error

2

: X

X

M

–

E

R

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

log display

3

: X

X

M

–

E

R

Mechanism error log 3 (Latest)

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

CD Load

1

: X

X

L

D

E

R

Load error switch 1

XX: Number of errors. “– –” is displayed in case there is no error.

/

error

information

2

: X

X

L

D

E

R

Load error switch 2

display

XX: Number of errors. “– –” is displayed in case there is no error.

FM

1

: X

X

E

J

E

R

Ejection error switch 1

(forward

XX: Number of errors. “– –” is displayed in case there is no error.

rotation)

CD Ejection

Ejection error switch 2

AM

2

: X

X

E

J

E

R

XX: Number of errors. “– –” is displayed in case there is no error.

(reverse

/

error

rotation)

information

3

: X

X

E

J

E

R

Ejection error switch 3

display

XX: Number of errors. “– –” is displayed in case there is no error.

4

: X

X

E

J

E

R

Ejection error switch 4

XX: Number of errors. “– –” is displayed in case there is no error.

CD time code

L

O

S

E

CD time code error count data (Missing counts) mode display.

/

error count

data display

: X

X

C

D

D

A

Number of CD-DA count errors

(Missing

XX: Number of errors. “– –” is displayed in case there is no error.

counts)

CD time code

S

T

A

Y

CD time code error count data (count not updated) mode display.

/

error count

data display

: X

X

C

D

D

A

Number of CD-DA count errors

(count not

XX: Number of errors. “– –” is displayed in case there is no error.

updated)

■Test mode specifications in TUNER source

Error is found in front-end (A1), etc. if indications below is displayed while in tuner source.

	Status	Display				Description
	Front-end (A1) E2PROM data error	E	2	E	R	Front-end (A1) E2PROM is still the default (unspecified) value.
	Front-end (A1) communication error	I	C	E	R	Communication with front-end (A1) is not possible.
	Destination mismatch	T	P	E	R	When destination is mismatch between front-end (A1)
						E2PROM and the product.

10

				KDC-138/138CR/139/139S
			TEST MODE
• TUNER preset operation
Key	Description of display				Description
4	Preset function		9 8 . 3		Change to 98.3MHz with the preset key [4].

• K3I forced switching

Every time when [6] key is pressed in tuner FM source, switched in the following order: AUTO → Forced WIDE → Forced MIDDLE → Forced NARROW → AUTO. Default status is AUTO, and displayed as shown below.

	Key	Description of display						Description
			A	9	8	.	1	AUTO (1)
	6	K3I Forced switching	3	9	8	.	1	Forced WIDE (2)
			2	9	8	.	1	Forced MIDDLE (3)
			1	9	8	.	1	Forced NARROW (4)

• FST adjustment mode

Perform FST soft-mute adjustment.

Key					Note
■					Enter the FST adjustment mode. (Press for 1 second or longer.)

Operations in the FST adjustment mode are as follows:

	Key						Description of display				Description
	FM (UP)						Soft-mute adjustment	S	D	– F	18dBµ (0) ↔ 36dBµ (F)
	AM (DOWN)
	■						Adjustment value	W	R	T	Displays the data that has been written in the E2PROM when
							memory				pressing the key for 2 seconds or longer.
							Mode clear	9	8	. 3	Clear the FST adjustment mode. (Returns to normal display
											and the test mode is retained.)

After completing the FST adjustment, if You wish to clear the test mode, You can do this using the reset button.

■Test mode specifications in CD source

• Procedure in CD-DA media (KTD-02A)

Key			Description of display		Description
					Every time pressed, jumps to the track shown below.
			Track up procedure		No.9 → No.15 → No.10 → No.11 → No.12 → No.13 → No.22 →
					No.14 → No.9 (recursive) But in case the disc has 8 tracks
					or less, playback starts with track No.1.
			Track down procedure		Goes down by 1 track from the currently played track.
1			Jump procedure		Jump to No. 28 (Scratch 0.7mm for MUSIC line vibration testing)
2			Jump procedure		Jump to No. 14 (Blurring surface disc TCD-731RA Tr14)
			Information display		Display of Mechanism model name and Mechanism version.
3			Mechanism model name	6 C 0 0 0 0 0 0	(When key is pressed while the display in the left is being
			Mechanism version		shown, returns to normal display.)
6			Jump procedure		Jump to No. 15. Set the volume value to “25”.
					(For 20Hz 0dB DC protection false-operation FCT checking)
Used media: For CD, KTD-02A

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KDC-138/138CR/139/139S

TEST MODE

■ Audio-related test mode

Procedure

Note

Enter audio adjustment mode (the initial item should be Fader, and then, Balance →

Press the [AUD] key (main unit)

Bass Level → Middle Level → Treble Level → SW Level → System Q → V-Offset →

Press the [AUD] and [ ] keys (Remote control)

LPF Sub Woofer.

About audio adjustment items (include both Audio Function Mode and Audio Setup Mode)

Procedure	Item	Procedure					Description
	Fader	[VOL] knob and [		/		] key	Adjust to 3 steps of R15 ↔ 0 ↔ F15. (Default value: 0)
	Balance	[VOL] knob and [		/		] key	Adjust to 3 steps of L15 ↔ 0 ↔ R15. (Default value: 0)
For item	Bass Level	[VOL] knob and [		/		] key	Adjust to 3 steps of -8 ↔ 0 ↔ +8. (Default value 0)
forwarding	Middle Level	[VOL] knob and [		/		] key	Adjust to 3 steps of -8 ↔ 0 ↔ +8. (Default value 0)
procedure,
	Treble Level	[VOL] knob and [		/		] key	Adjust to 3 steps of -8 ↔ 0 ↔ +8. (Default value 0)
press [AUD]
	LPF Sub						Adjust to 2 steps of 80Hz ↔ Through. (Default value: Through)
key and		[VOL] knob and [		/		] key
	woofer						(Only in models with Sub Woofer output)
[FM] key
							Adjust to 2 steps of -8 ↔ 0. (Default value 0) (Other than model with internal AUX)
	Volume Offset	[VOL] knob and [		/		] key	Adjust to 3 steps of -8 ↔ 0 ↔ +8. (Default value 0)
							(Only models with internal AUX)

Procedure	Note
Press the [B.BOOST] key for 1 second or longer	Switch Bass Boost (Note: Front key functions as MENU.)

■ [ATT] key operation

Procedure					Note
In the TUNER source, press [				] key	ATT OFF/ON

■ MENU-related test mode

Procedure

Note

Press the [B.BOOST] key (main unit)

Continuous forwarding by remote control is prohibited

Press the [DNPP/SBF] and [DIRECT] keys (Remote control)

■ Backup current measurement

Procedure

Note

MUTE terminal is OFF after 2 seconds, not after 15 seconds.

While ACC OFF (Back Up ON), Reset

(During this time, the CD mechanism does not function.)

■ PREOUT switching (KDC-138/139/139S only)

Procedure

Note

In the STANDBY source, press and hold [AUTO] key for

Switches PREOUT

1 second or longer

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