KENWOOD KDC-237SA, KDC-237SAY, KDC-237SG, KDC-237SGY Service Manual

CD RECEIVER

KDC-237SA/237SAY KDC-237SG/237SGY

SERVICE MANUAL

© 2006-12 PRINTED IN JAPAN B53-0481-00 (N) 345

SPARE TDF PANEL

MAIN UNIT NAME	TDF PARTS No.	TDF NAME
KDC-237SA/237SAY	Y33-2660-62	TDF-237A
KDC-237SG/237SGY	Y33-2660-63	TDF-237G

Panel assy

KDC-237SA/237SAY/237SG/237SGY (A64-4059-02)

B.BOOST

MENU

/PTY

DISP

KDC-237

FM

VOL

SCRL

AUD

SET UP

AM

TI AME

SCAN

RDM

REP

ATT

Lever	DC cord	Carrying case
(D10-4589-04) x2	(E30-6427-05)	(W01-1685-05)

Antenna adaptor	Escutcheon	Mounting hardware assy
(T90-0523-05)	(B07-3122-01)	(J21-9716-03)

This product uses Lead Free solder.

KDC-237SA/237SAY

KDC-237SG/237SGY

BLOCK DIAGRAM

ELECTRIC UNIT (X34- )

J2	ANT.					Q901-903
A1	J4	BU	DME1			DC-DET
TUNER	AM+B LX-BUS BU		CD		BU		R103
FRONT-END	A8V	A8V	MECHA		IC6	PHONE	PHONE	BU5
	SW5	SERVO+B
			16	3	POWER		Q101
3					IC

IC9

Q401

1

ACC DET

ACC-DET

ANALOG

A8V

SW

A8V

Q103

1

SW

CONT

BU DET

BU-DET

BU5

IC2 or IC3

Q102

1

Q701-704

CN4,J5

MUTE

SURGE-

E-VOL

SW5

PRE-OUT

1

A8V

PRE-OUT

DET

IC7

FRONT/

MUTE

ROM CORRECTION (NOT USED)

REAR/SW

RDS

IC4

DECODER

IC10

BU5

SW5

E2PROM

PS1-1 / PS1-2 / PS1-3

2

1

1

BU5

3

3

8

IC1

Q705

PS2-1 / PS2-2

BU5

MUTE

BU DET

FL+B

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

WIRED

SW5

BU5

ILLUMI+B

R11-15

PS1-1 / PS1-2 / PS1-3

SERVO+B

CD

PS2-1 / PS2-2

CN3

PAN5V

1/2W

1

Q2

FL+B

Rx5

Q302

REMOTE

DSI

BU5

SERVO

J3

Q1

CN

SW14V

SW5

to GND

J1

R80-82

1/2W

FL+B

Q8,9

PANEL DET

Rx3

ILLUMI

ILLUMI+B

IC1

ED1

+B

S3

J2

S1

VFD

Q7

RESET

F-AUX

ROTARY

VFD

SW14V

P.ON FL

ENCODER

DRIVER

2

KEY

SW5

ILLUMI

IC2

SW5

9

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

CLK

LEVEL SHIFT

CLK

E

F

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

X1 or

8EJE-SW

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

J1

DC-CN

PHONE

SP-OUT

ACC

B.U.

P-ANT P-CON

2

KDC-237SA/237SAY

KDC-237SG/237SGY

COMPONENTS DESCRIPTION

● ELECTRIC UNIT (X34-4672-78)

Ref. No.	Application / Function	Operation / Condition / Compatibility
IC1	System -COM	Controls FM/AM tuner, the changer, CD mechanism, panel, volume and tone.
IC3	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 45W maximum.
IC7	RDS IC	RDS decoder.
IC8	Reset IC	Lo when detection voltage goes below 3.6V.
Q1	SW14V	ON when the base goes Hi.
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.
Q7	VFD+B SW	ON when the base goes Hi.
Q8	VFD+B AVR	When Q9’s base goes Hi, Servo+B AVR outputs 10.5V.
Q9	Control SW for VFD+B	ON when the base goes Hi.
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.
Q302	DSI ILLUMI SW	ON when the base goes Hi.
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 (X16-386x-xx)

Ref. No.	Application / Function	Operation / Condition / Compatibility
IC1	VFD Driver

● CD PLAYER UNIT (X32-5980-00)

	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 -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.
	IC3	3.3V REG	Supplies 3.3V to IC1 and audio circuit.
	IC6	4ch BTL Driver	Focusing and tracking coil, sled and spindle motor driver, disc loading and eject operation.
	Q1	A8V SW	Q1 is ON when Q2 is ON.

3

KDC-237SA/237SAY

KDC-237SG/237SGY

COMPONENTS DESCRIPTION

Ref. No.	Application / Function	Operation / Condition / Compatibility
Q2	Q1 SW	Q2 is ON when Q6 is ON.
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 -COM. Q6 is ON when pin 63 (P_ON1) of IC1 is Hi.
Q9	Power Supply Control	Power Supply Control from system -COM. Q6 is ON when pin 125 (MSTOP) of IC1 is Hi.
D1,2	5V Force Voltage Prevention	5V Force Voltage Prevention from MECHA -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.

MICROCOMPUTER’S TERMINAL DESCRIPTION

● SYSTEM -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 Lo fixed
6	REMO					I	Remote control signal input		Detects pulse width
7	NC					-	Not used		Output L fixed
8	BYTE					I	Memory extended bus width setting		Connects to VSS
9	CNVSS					-			Connects to VSS
10	XCIN					-	32.768kHz
11	XCOUT					-	32.768kHz
12						-			L: Reset
			RESET
13	XOUT					-	10.0MHz
14	VSS					-
15	XIN					-	10.0MHz
16	VCC1					-
17	NMI					I			Connects to VSS
18						I	Panel communication detection		H: Panel detached, L: Panel attached
		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

4

KDC-237SA/237SAY

KDC-237SG/237SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.		Pin Name		I/O	Application	Truth Value	Processing Operation Description
						Table
24	PON FL			O	Key illumination power supply control		ON: H, OFF: L
25	NC			-	Not used
							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	NC			-	Not used		Output L fixed
28	PWIC BEEP			O	Beep output
29	AUD SCL			I/O	E-VOL clock output
30	AUD SDA			I/O	E-VOL data input/output
31	VFD SYS DATA			O	VFD data output
32	VFD PAN DATA			I	VFD data input
33	VFD CLK			O	VFD clock output		125kHz
34	VFD BLK			O	VFD data blanking output		H: Reset cancelled, L: Reset, Momentary power down
							/Panel detached: L, 11 minutes after ACC OFF: L
35	CD SI			O	CD mechanism serial output
36	CD SO			I	CD mechanism serial input
37	CD CLK			O	Serial clock output		1MHz
38	CD LOS SW			I	CD loading detection
39	PIO0			I	Communication request from mechanism DSP		H: Data request
40	CD SRAMSTB			O	1M-bit SRAM standby		H: SRAM standby
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			O	CD mechanism power supply control		H: Power ON
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	VFD control request
47	CD DRIVEMUTE			O	Motor driver mute output
48	CD CCE			O	CD mechanism chip enable
49	CD DISC8 SW			I	8cm disc detection		Pull-up (B.U.)
50	CD MRST			O	CD mechanism -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	NC			-	Not used		Output L fixed
59	DSI			I/O	DSI control		OFF: Hi-z, Panel detached: Pulse drives, ON: H
60	RDS DATA			I	RDS decoder data input
61	RDS QUAL			I	RDS decoder QUAL input
62	VCC2			-

5

KDC-237SA/237SAY

KDC-237SG/237SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No.			Pin Name			I/O	Application	Truth Value	Processing Operation Description
								Table
63	NC					-	Not used		Output L fixed
64	VSS					-
65	RDS AFS M					I/O	Noise detection time constant switching	w	Refer to the truth value table
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	RDS CLK					I	RDS decoder clock input
75	LX REQ S					I	Communication request from slave unit		Pull-down (GND)
76	PWIC SVR					O	SVR discharging circuit		During 500ms after 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
79	ACC DET					I	ACC power supply detection		ACC found: L, No ACC: H
									BU found: L, No BU/Momentary power down: H
80	BU DET					I	Detection of momentary power down		(Operates after less than 4ms after momentary
									power down is detected)
81,82	NC					O	Not used		Output L fixed
83	RDS NOISE					I	FM noise detection
84	TUN SMETER					I	S-meter input
85	TYPE1					I	Destination switching	e	Refer to the truth value 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 selection		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	PON					-	Not used		POWER ON: H, POWER OFF: L

6

KDC-237SA/237SAY

KDC-237SG/237SGY

MICROCOMPUTER’S TERMINAL DESCRIPTION

	Pin No.	Pin Name	I/O	Application	Truth Value	Processing Operation Description
					Table
	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

w AFS control

	RDS AFS M				Condition
AFS MID		L		Except AF search, seeking or tuner source
AFS HIGH	Hi-Z			Normal reception
e Destination switching
TYPE 2		TYPE 1			Model
(Pin 86)		(Pin 85)
2.4V		0V			KDC-237SA/237SAY/237SG/237SGY

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-237SA/237SAY

KDC-237SG/237SGY

TEST MODE

■ Example

:

:

.

Key	Description of display		Description
5	Disc EJECT times display	E J C X X X X X	Disc EJECT times display. MAX 65535 (times)
■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.

Do not display “CODE_OFF”, “CODE_ON” or “CODE_NG” when Power is ON.

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.

When operating in the test mode, CD mechanism error log information clear mode, and DC offset error detection information clear mode, do not perform DEMO mode operations.

Also, do not display DEMO ON/OFF option items in the MENU in STANDBY source in the above modes.

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
System Q	NATURAL (FLAT)
Beep	Sound on with a key pressed regardless of any settings.
Preout	Sub Woofer

8

KDC-237SA/237SAY

KDC-237SG/237SGY

TEST MODE

■ Special displays when all lights are on in STANDBY source

Key

Description of display

Description

Common

All lights ON.

All lights ON.

1

Destination terminal

T

Y

P

E :

1

1

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

condition indication

real-time condition of the destination terminal.

Development ID condition

6

1

1

A

2

–

3 . 0 0

Development ID – Version (system -com: IC1)

indication

2

Serial No. display

0

0

0

0

0

0

0

0

Serial No. is displayed (8 digits)

3

Power ON time display

P

O

N

0

H

X

X

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

displayed by displayed by increments of 10 minutes.

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.

4

Disc operation time display

C

D

T

0

H

X

X

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

displayed by increments of 10 minutes.

C

D

T

X

X

X

X

X

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

■4

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.)

5

Disc EJECT times display

E

J

C

X

X

X

X

X

Disc EJECT times display. MAX 65535 (times)

■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)

■6

times display

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

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

FM

ROM correction version

R

O

1

2

3

The number is the ROM correction version number.

display

E

R

R

When E2PROM is not installed.

R

–

–

–

–

When not written in yet.

R

*

*

*

*

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

■AM

ROM data transfer

Audio data initialization

A

U

D

I

N

I

T

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

Forced Power OFF

P

O

F

F

–

–

–

No forced power OFF

information display

P

O

F

F

S

E

C

Forced power OFF because of missing Security Code.

(Code security supporting model)

P

O

F

F

P

N

L

Forced power OFF by communication error between system

-com and panel.

■

While the forced power OFF data is displayed, press and

hold for 2 seconds to clear the data.

CD information display

For the display contents, refer to “CD information display

mode ON/OFF

mode” in the next section.

■

While in CD information display mode, press and hold for

2 seconds or longer to clear all CD information.

9

KDC-237SA/237SAY

KDC-237SG/237SGY

TEST MODE

• CD information display mode

Key

Description of display

Description

FM

I2C com-

I

2

C

O

K

I2C communication OK

(forward

munication

rotation)

status

I

2

C

N

G

I2C communication NG

AM

(reverse

/

CD mecha-

M

C

E

R

R

1

:

X

X

Mechanism error log 1 (Latest)

rotation)

nism error

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

log display

M

C

E

R

R

2

:

X

X

Mechanism error log 2 (Latest)

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

M

C

E

R

R

3

:

X

X

Mechanism error log 3 (Latest)

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

/

CD Load

L

D

E

R

R

1

:

X

X

Load error switch 1

error

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

information

L

D

E

R

R

2

:

X

X

Load error switch 2

display

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

/

CD Ejection

E

J

E

R

R

1

:

X

X

Ejection error switch 1

error

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

information

E

J

E

R

R

2

:

X

X

Ejection error switch 2

display

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

E

J

E

R

R

3

:

X

X

Ejection error switch 3

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

E

J

E

R

R

4

:

X

X

Ejection error switch 4

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

/

CD time code

C

N

T

L

O

S

E

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

error count

C

D

D

A

:

X

X

Number of CD-DA count errors

data display

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

(Missing

counts)

/

CD time code

C

N

T

S

T

A

Y

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

error count

C

D

D

A

:

X

X

Number of CD-DA count errors

data display

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

(count not

updated)

10

KDC-237SA/237SAY

KDC-237SG/237SGY

TEST MODE

■ 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	T	N	E	2	P	N	G	Front-end (A1) E2PROM is still the default (unspecified) value.
Front-end (A1) communication error	T	N	C	O	N	N	G	Communication with front-end (A1) is not possible.

• TUNER preset operation

Key		Description of display			Description
4	Preset function		F M 1	9 8 . 3 A 4	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
6	K3I Forced switching		F	M	1	9	8 .	1	A	AUTO
			F	M	1	9	8 .	1	W	Forced WIDE
			F	M	1	9	8 .	1	M	Forced MIDDLE
			F	M	1	9	8 .	1	N	Forced NARROW

• RDS auto measurement

Add the process to replace the visual inspection of PS display previously done in the production line.

Status		Display	Description
PS data reception	R D S	T E S T	If displayed as shown at the left, force to OFF.
			P-CON is recovered by Power OFF/ON.

• 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

M

D

–

F

18dBµ (0) ↔ 36dBµ (F)

AM (DOWN)

■

Adjustment value

E

P

W

R

I

T

E

Displays the data that has been written in the E2PROM when

memory

pressing the key for 2 seconds or longer.

Mode clear

F

M

1

9

8 .

3

A 4

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.

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KDC-237SA/237SAY

KDC-237SG/237SGY

TEST MODE

■ Test mode specifications in CD source

Display mode default: P-Time

• Procedure in CD-DA media (KTD-02A)

Key			Description of display				Description
			Track up procedure		Every time pressed, jumps to the track shown below.
					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)
3			Information display	6 E 0 0 :	Display of Mechanism model name and Mechanism version.
			Mechanism model name		(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

■ Audio-related test mode

Procedure	Note
Press the [AUD] key (main unit)	Enter audio adjustment mode (the initial item should be Fader, and then, Balance →
Press the [AUD] and [ ] keys (Remote control)	Bass Level → Middle Level → Treble Level → System Q → V-Offset →

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

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

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

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