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

CD RECEIVER

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

SERVICE MANUAL

SPARE TDF PANEL

MAIN UNIT NAME TDF PARTS No. TDF NAME KDC-237SA/237SAY KDC-237SG/237SGY

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

B53-0481-00 (N) 345

Y33-2660-62 TDF-237A Y33-2660-63 TDF-237G

B.BOOST

VOL

AUD

SET UP

ATT

Lever (D10-4589-04) x2

Antenna adaptor (T90-0523-05)

AME

SCAN RDM REP

DC cord (E30-6427-05)

Escutcheon (B07-3122-01)

KDC-237

Mounting hardware assy (J21-9716-03)

SCRL

Carrying case (W01-1685-05)

DISP

PTY

This product uses Lead Free solder.

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

ELECTRIC UNIT (X34- )

ANT.

TUNER FRONT-END

IC7

RDS DECODER

IC1

IC8

BU5

RESET IC

CN3

WIRED REMOTE

to GND

PANEL DET

RESET

SWITCH UNIT (X16- )

AM+B

LX-BUS

A8V SW5

IC2 or IC3

SW5

A8V

ROM CORRECTION (NOT USED)

F-AUX

ROT ARY ENCODER

SW5

IC2

REMOTE

SW5

IC9

ANALOG SW

IC10

E2PROMSW5

SYSTEM u-COM

SERVO+B

Q401

A8V A8V

SW CONT

E-VOL

111

Q301

PAN5V

BU5

SW5

BLOCK DIAGRAM

DME1

A8V

IC1

VFD DRIVER

MUTE

ILLUMI+B

MECHA

R11-15

1/2W Rx5

FL+B

KEY ILLUMI

KEY MATRIX

R80-82

1/2W Rx3

BU5

FL+B

ED1

VFD

DSI

Q302

IC6

POWER IC

Q701-704

PRE-OUT MUTE

BU5 BU5

MUTE

DC-CN etc

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

BU5

Q705

Q901-903

DC-DET

CN4,J5

PRE-OUT

FRONT/ REAR/SW

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

BU DET RST

ACC DET

BU DET

FL+B

AM+B

SW5

A8V

SW5

BU5

SERVO+B

ILLUMI+B

PHONE

R103

PHONE

Q101

ACC-DET

Q103

BU-DET

Q102

SURGEDET

IC4

POWER SUPPLY IC

CD SERVO

SW14V

Q8,9

ILLUMI +B

SW14V

BU5

SW5

P.ON FL

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

COMPONENTS DESCRIPTION

● ELECTRIC UNIT (X34-4672-78)

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

IC1 System µ-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

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.

& 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.

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 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.

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 Lo fixed 6 REMO I Remote control signal input Detects pulse width 7NC-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 RESET - L: Reset 13 XOUT - 10.0MHz 14 VSS 15 XIN - 10.0MHz 16 VCC1 17 NMI I Connects to VSS 18 PANEL DET I Panel communication detection H: Panel detached, L: Panel attached 19,20 NC - Not used Output L fixed 21 22,23 NC - Not used Output L fixed

ROMCOR DET

I E2PROM writing request H: Writing

Truth Value

Table

Processing Operation Description

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

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

24 PON FL O Key illumination power supply control ON: H, OFF: L 25 NC - Not used

26 PON PANEL I/O Panel 5V control

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 32 33 VFD CLK O VFD clock output 125kHz

34 VFD BLK O VFD data blanking output

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 40 CD SRAMSTB O 1M-bit SRAM standby H: SRAM standby 41 EPM I Flash EPM input Connects to VSS 42 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 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 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 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 -

VFD SYS DATA VFD PAN DATA

CD LOE LIM SW

CD DRIVEMUTE

CD DISC12 SW

O VFD data output

I VFD data input

Communication request from mechanism DSP

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

O Motor driver mute output

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

Truth Value

Table

Processing Operation Description

ON: L, Momentary power down/Panel detached : Hi-Z, 11 minutes after ACC OFF: Hi-Z

H: Reset cancelled, L: Reset, Momentary power down /Panel detached: L, 11 minutes after ACC OFF: L

H: Data request

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

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

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

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 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

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

78 PWIC MUTE O Power IC mute

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

80 BU DET I Detection of momentary power down (Operates after less than 4ms after momentary

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

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

PON EXT GND

ANALOG CON

PWIC DC DET

I/O IC2 external input quick charge control

OAUX/LX audio switching

I DC offset detection

Truth Value

Table

Processing Operation Description

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 first-out mute begins to work), LX/Other source: L

During 500ms after 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

power down is detected)

If DC offset is found 20 times in 100ms with condition of over 1.0V, it will be judged as DC offset detected.

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

MICROCOMPUTER’S TERMINAL DESCRIPTION

Pin No. Pin Name I/O Application

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

Processing Operation Description

• 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

AFS MID L

AFS HIGH Hi-Z Normal reception

e Destination switching

Except AF search, seeking or tuner source

Condition

r Power supply IC (IC4) control SEL1 (Pin 10)

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

LLLOFFOFF OFF

LLHONOFF OFF HLHONONOFF HHHONONON

SEL2 (Pin 11)

PS1-1 PS2-2

LLOFF OFF HLONOFF HHONON

AUDIO/SW5

TYPE 2 TYPE 1 (Pin 86) (Pin 85)

2.4V 0V

Model

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

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

TEST MODE

■ Example

::.

Key Description of display Description

5 Disc EJECT times display

■5 While disc EJECT times is displayed, press and hold for

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.

E J C X X X X X

Disc EJECT times display. MAX 65535 (times)

2 seconds or longer to clear disc EJECT times.

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

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

TEST MODE

■ Special displays when all lights are on in STANDBY source

Key Description of display Description

Common

■AM ROM data transfer

■ While the forced power OFF data is displayed, press and

■ While in CD information display mode, press and hold for

All lights ON. All lights ON.

1 Destination terminal

T Y P E : 1 1

“TYPE” indicates system µ-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 µ-com: IC1) indication

2 Serial No. display 3Power ON time display

0 0 0 0 0 0 0 0

P O N 0 H X X

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.

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 display ed 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.

6Panel open/close

■6 times display

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

FM ROM correction version

display

Audio data initialization Forced Power OFF information display

R O 1 2 3

E R R

R – – – –

****

A N I TUD I

P – – –OFF

P S E COFF

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 because of missing Security Code. (Code security supporting model)

P P N LOFF

Forced power OFF by communication error between system µ-com and panel.

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.

2 seconds or longer to clear all CD information.

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

TEST MODE

• CD information display mode

Key Description of display Description

FM I2C com(forward munication rotation) status

AM (reverse rotation) nism error XX: Error number. “– –” is displayed in case there is no error.

/ CD mecha-

log display

/ CD Load

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

/ CD Ejection

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

CD time code error count data display XX: Number of errors. “– –” is displayed in case there is no error. (Missing counts)

CD time code error count data display XX: Number of errors. “– –” is displayed in case there is no error. (count not updated)

I K2C O

I G2C N

M 1 : X XCERR

M 2 : X XCERR

M 3 : X XCERR

L 1 : X XDERR

L 2 : X XDERR

E 1 : X XJERR

E 2 : X XJERR

E 3 : X XJERR

E 4 : X XJERR

C O S ENT L

C X: XDDA

C T A YNT S

C X: XDDA

I2C communication OK

I2C communication NG

Mechanism error log 1 (Latest)

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

Load error switch 2

Ejection error switch 1

Ejection error switch 2

Ejection error switch 3 XX: Number of errors. “– –” is displayed in case there is no error. Ejection error switch 4 XX: Number of errors. “– –” is displayed in case there is no error. CD time code error count data (Missing counts) mode display. Number of CD-DA count errors

CD time code error count data (count not updated) mode display. Number of CD-DA count errors

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 Front-end (A1) communication error

• TUNER preset operation

Key Description of display Description

4 Preset function

• 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

T N GNE2P

T N GNCON

F 8 . 3 A 4M1 9

F 8 . 1 AM1 9

F 8 . 1 WM1 9

F 8 . 1 MM1 9

F 8 . 1 NM1 9

Front-end (A1) E2PROM is still the default (unspecified) value. Communication with front-end (A1) is not possible.

Change to 98.3MHz with the preset key [4].

AUTO Forced WIDE Forced MIDDLE 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 E S TDS 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

AM (DOWN)

■ Adjustment value memory pressing the key for 2 seconds or longer. Mode clear

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

S MD – F

E I T EPWR

F 8 . 3 A 4M1 9

18dBµ (0) ↔ 36dBµ (F)

Displays the data that has been written in the E2PROM when

Clear the FST adjustment mode. (Returns to normal display and the test mode is retained.)

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

■ 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.

Track down procedure Goes down by 1 track from the currently played track. 1Jump procedure 2Jump procedure Jump to No. 14 (Blurring surface disc TCD-731RA Tr14) 3 Information display

Mechanism model name (When key is pressed while the display in the left is being

Mechanism version shown, returns to normal display.) 6Jump procedure Jump to No. 15. Set the volume value to “25”.

Used media: For CD, KTD-02A

6 E00:

TEST MODE

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.

Jump to No. 28 (Scratch 0.7mm for MUSIC line vibration testing)

Display of Mechanism model name and Mechanism version.

(For 20Hz 0dB DC protection false-operation FCT checking)

■ 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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