Kenwood 303, 303E, 353, 353E, 503 Service Manual

...

70%

MINI HiFi COMPONENT SYSTEM

DISC

STANDBY

TIMER

DISPLAY/DEMO

SELECTBACK ENTER

SOUND

CONTROL

TUNING

MODE

REC/ARM

REVERSE

MODE

TAPE EQ.

PHONES

DISC SKIP

OPEN/ CLOSE

PUSH OPEN

DECK

PLAY

DECK

REC/PLAY

VOLUME

CONTROL

RXD-303/303E/353/353E/503/503E/553/553E/

553-GR/553E-GR/653/653E/A33/A53/A53-GR

SERVICE MANUAL

(XD-303~A73)**

Panel(CD) * (A29-)

Front glass * (B10-)

Knob * (K29-)

Panel ass'y * (A60-)

Phone jack (E11-0280-05)

**Refer to page 2 if you want to know system configuration.

In compliance with Federal Regulations, following are reproductions of labels on, or inside the product relating to laser product safety.

Knob * (K29-)

* Refer to parts list on page 33.

KENWOOD-Crop. certifies this equipment conforms to DHHS Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.

DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM

Unplug the power cord from the power outlet then, while holding the ENTER key depressed, plug the power cord again.

÷ Please note that resetting the microcomputer clears the

stored contents and returns to the factory set condition.

Operation to reset

The microcomputer may fall into malfunction (impossibility to operate, erroneous display, etc.) when the power cord is unplugged while power is ON or due to an external factor. In this case, execute the following procedure to reset the microcomputer and return it to normal condition.

(Main unit only)

SYSTEM

MAIN UNIT

DESTINATION SPEAKER

SP CORD PSRTS No

XD-303 RXD-303 KE LS-N303 E30-5829-08 XD-303E RXD-303E E1 LS-N303 E30-5829-08 XD-353 RXD-353 YMXTEH LS-N353 E30-5829-08 XD-353E RXD-353E E1 LS-N353 E30-5829-08 XD-353(M3) RXD-353 M LS-N353(M3) E30-5829-08 XD-353(M5) RXD-353(M5) M5 LS-N353(M3) E30-5829-08 XD-503 RXD-503 KPE LS-N503 E30-5829-08 XD-503E RXD-503E E1 LS-N503 E30-5829-08 XD-553 RXD-553 YMXTE LS-N553 E30-5829-08 XD-553E RXD-553E E1 LS-N553 E30-5829-08 XD-553(M3) RXD-553 M LS-N553(M3) E30-5829-08 XD-553(M5) RXD-553(M5) M5 LS-N553(M3) E30-5829-08 XD-553-GR RXD-553-GR ET1 LS-N553-GR E30-5829-08 XD-553E-GR RXD-553E-GR E1 LS-N553-GR E30-5829-08 XD-653 RXD-653 TEX LS-N653 E30-5475-05 XD-653 E RXD-653 E E1 LS-N653 E30-5475-05 XD-753 RXD-553 MX LS-N753 E30-5838-08 XD-753(M3) RXD-553 M LS-N753(M3) E30-5838-08 XD-753(M5) RXD-553(M5) M5 LS-N753(M3) E30-5838-08 XD-A33 RXD-A33 KP LS-N353 E30-5829-08 XD-A53 RXD-A53 KP LS-N553 E30-5829-08 XD-A73 RXD-A53 KP LS-N753 E30-5838-08

FM indoor antenna (1) AM loop antenna (1)

Speaker cords (2)

(XD-653

Refer to system configuration.

only)

Remote

(T90-0836-05) (T90-0852-05) (A70-1337-05): RC-553....KPMXYK1P1M5

(A70-1338-05): RC-553E....TEE1T1

Battery cover (A09-1151-08)

control unit (1)

Use to adapt the plug on the power cord tothe shape of the wall outlet. (Accessory only for regions where use is necessary.)

AC (E03-0115-05)

plug adaptor (1)

Provided in the speaker package

Batteries (R6/AA) (2)

RXD-303/353/503/553/653/A33/A53

CONTENTS / ACCESSORIES / CAUTIONS

CONTENTS / ACCESSORIES / CAUTIONS............. 2

EXTERNAL VIEW.......................................................3

DISASSEMBLY FOR REPAIR....................................3

BLOCK DIAGRAM......................................................4

CIRCUIT DESCRIPTION............................................5

ADJUSTMENT..........................................................10

WIRING DIAGRAM...................................................12

Accessories

PARTS DESCRIPTIONS..........................................13

PC BOARD .............................................................. 14

SCHEMATIC DIAGRAM.......................................... 19

EXPLODED VIEW ....................................................31

PARTS LIST..............................................................33

SPECIFICATIONS....................................................43

SYSTEM CONFIGURATION

Cautions

ENTER

AC 220-

240V~

AC 110120V~

GND

ANTENNA

FRONT

SPEAKERS

(

6-16

)

DVD/VIDEO INPUT

SURROUND

SPEAKERS

(

8-16

)

OFF

SURROUND

RXD-303/353/503/553/653/A33/A53

BOTTOM SIDE

HOW to open the tray if not comes out.

(1) Turn the friction arm counterclockwise using a screw driver and the like.

(2) Pull out the tray frontwards by hand when the tray comes just out.

EXTERNAL VIEW

Lock terminal board (E70-0124-05)

Slide switch (S62-0077-05)

Lock terminal board (E70-0123-05)

Cover (F07-1692-01)

Metallic cabinet * (A01-)

Lock terminal board (E70-0052-05)

Pin jack (E63-0095-05)

DISASSEMBLY FOR REPAIR

Slide switch (S62-0001-05)

CLK

PLL-CLK

PLL-CE

PLL-DO

SD ST

PLL-DATA

S-LEVEL

DE-EMPH

R/P

LATCH

Lch-OUT

Rch-OUT

+12V

REC

PB AMP

AMP

(600mV)

DECK (580mV)

CD (1.2V)

Lch-OUT

Rch-OUT

D OUT

XCOUT

XCIN

(16.9344MHz)

DATA

POWER RELAY

XIN

XOUT

XCIN

XCOUT

(10MHz)

(32.768KHz)

MAIN CLOCK

TIMMER CLOCK

MPX CLK

DATA

u-COM

TUNER

C1,C2

A,B

CANCEL

BEAT

OUT

REC-MUTE

A/B

AEQ

BEQ

SPEANA

DATA/CLK RDS IC

PROTECTION

SP RELAY

ATT

MUTE

BEEP

TIMER

STANDBY

R/PERASE

SOUND

OSC

BIAS

BIAS TRAP

BA3126N

CXA1498S

OTHER ch

H.P.

Rch

Lch

RF AMP AN8806SB

PICKUP/ LOADING DRIVER

CD DSP MN662748

KEY

(X13)

TUNER PACK

FM75

ANT

B DECK

(X28)

DECK

MECHA

IC2

IC1

CN1

IC12

RDS

INPUT ATT .

M62498FP

IC11 M62498FP

MD/DVD IN

IC4

IC1

CD MECHA

CDM-35

D.OUT

(OPTICAL)

MAIN u-COM

M30622MA-A42FP

(X07)

Q3,4

Q1,2

Q13,15

-10dB

MUTE

IC2

IC101

(X14)

AMP

GND

DEMODULATOR

L.P.F.

LOUDNESS

INPUT SELECTOR INPUT VOL. MAIN VOL. 3BAND TONE

L/R

FRONT

SUV VOL.

SELECTOR

INPUT SELECTOR /E.VOL.

(X32)

HEAD SW

PLAY/REC

PLAY BACK

/REC EQ.

A DECK

14,16

IC3

SPEAKERS

(X14)

AMP

Q14,16

BASS REVISE CIRCUIT

AC/DC PROTECTION

MTX

SLch

SRch

OFF

GND

IC5

AVR

-V

D51

GND

D52

GND

AVR

-35V

AVR

12V

Q15

Q11

AVR

Q13

AVR

Q14

AVR

X32,Q2

DECK

TUNER

LOADING DRIVER

PICKUP DRIVER

CD DSP.RF AMP

CONTROL IC

ELECTRIC VOL

-40V

MAIN u-COM

FIL

12V

MAIN

FIP

IC1

ED1

KEY1-3

BASS MID TRE

VOLUME

BASS BOOST CANCEL CIR.

FIP DRIVER

REMOCON INTERFACE

ATT.

BACKUP

u-COM

Q13,

CN2

(T/E TYPE ONLY)

RXD-503/553/653

E/T TYPE ONLY

EXCEPT FOR

K/P TYPE

RXD-653/653E

RXD-303/303E/353/353E RXD-503/503E/553/553E/553-GR/553E-GR

RXD-A33/A53/A53-GR

RXD-303/353/503/553/653/A33/A53

BLOCK DIAGRAM

RXD-303/353/503/553/653/A33/A53

Set Type BAND

Receving Frequency

Range

Channel

Space

FM 87.5MHz

108.0MHz 100kHz +10.7MHz 25kHz

K,P K1

AM 5 30kHz

1700 kHz 10kHz +450 kHz 10kHz

FM 87.5MHz

108.0MHz 100kHz +10.7MHz 25kHz

M,Y(1) K2

AM 530kHz

1610kHz 10kHz + 450kHz 10kHz

FM 87.5MHz

108. 0MHz 50kHz +10. 7MHz 25kHz

M,Y(2),X E1

AM 531kHz

1602kHz 9kHz +450 kHz 9kHz

FM 87. 5MHz 108.0MHz 50kHz +10.7MHz 25kHz

E,E2

RDS AM 531kHz

1602kHz 9kHz +450 kHz 9kHz

FM 87. 5MHz

108. 0MHz 50kHz +10. 7MHz 25 kHz

MW 531kHz

1602kHz 9kH z +450 kHz 9kHzT

RDS

LW 153kHz

72 9kHz 9kHz +450kHz 9kHz

CIRCUIT DESCRIPTION

1. Initialization

1-1 Setting of the Initial Conditions

While pressing the [ENTER] key, plug the AC cord into AC

wall outlet.

1-2 Initializing Operation

• A Microcomputer is initialized for start when the AC power is turned on when pressing the [ENTER] key. At that time, CD and cassette mechanisms are also initialized.

• During the initial conditions, the display shows *INITIALIZE* and after that it will be returned to standby condition.

1-3 Initial Items

(1) AMPLIFIER

• POWER ON/STANDBY STANDBY

• VOLUME 14

• BALANCE CENTER

• INPUT SELECTOR TUNER

• SOURCE DIRECT OFF

• MUTE OFF

• AUTO POWER SAVE OFF

• AUX(DVD/VIDEO) INPUT LEVEL

-3

• DISPLAY MODE AUTO

• BEEP SOUND ON

(2) TUNER

• BAND FM

• FREQUENCY LOWEST FREQUENCY

• AUTO/MONO AUTO

• PRESET CHANNEL "– –"ch

2. Destination List of Tuner

(3) CASSETTE DECK

• REVERSE MODE REVERSE

• TAPE A/B B

• TAPE DIRECTION FORWARD

(4) AUX (DEV/VIDEO)

• DVD/VIDEO DISPLAY DVD

(5) CLOCK

• CLOCK 0:00(E,E2,T)/12:00am(OTHER)

• Program Timer Recoding ON TIME 0:00(E,E2,T)/12:00(OTHER) OFF TIME 0:00(E,E2,T)/12:00(OTHER)

• Program Timer Play ON TIME 0:00(E,E2,T)/12:00(OTHER) OFF TIME 0:00(E,E2,T)/12:00(OTHER)

• Program on Mode OFF

• SLEEP TIMER OFF

(6) Equalizer

• Equalizer OFF

• CUSTOM EQ.1~3 FLAT

• EX. BASS ON

• 3D LEVEL OFF

1-4 Mechanism Initialization

1-4-1 CD Mechanism

• If a mechanism error occurs *C ERR* is indicated on the display.

1-4-2 DECK mechanism

• When the initial condition becomes NG for the third time,decide the error. The error condition is displayed as X ERR on the display.

1-4-3 Error display

• If both mechanism (CD/DECK) error occur, the display is indicated as follows.

• CD & X ERR

RXD-303/353/503/553/653/A33/A53

CIRCUIT DESCRIPTION

3. Test Mode

3-1 Setting of the Test Mode

AUX MODE AUX(DVD VIDEO) key+AC-ON

TUNER MODE TUNER(BAND) key+AC-ON

TAPE MODE TAPE A(< >) key+AC-ON

CD MODE DISC3 key+AC-ON

MENU key+AC-ON

The oscillation diagnosis(existence of oscillation and measurement of period) of a sub clock is per-

SUB CLOCK OSC

DIAGNOSIS

3-2 Cancel of the test mode

By turning the power off, the system is initialized and the test mode is canceled.

3-3 Contents of the Test Mode

3-3-1 Tuner Test mode

KEY DISPLAY OPERATION

SELECT Normal indication 10 20 30 00 (- -)

MENU Normal indication BACK TUNING DOWN

SOUND CONTROL

TUNING MODE P. ch DOWN

ENTER

DISPLAY/DEMO FL indication ON FL indication OFF

CD OPEN/CLOSE

formed before the test mode is entered. If the diagnosis result is OK, the system enters the test mode. If the diagnosis result is NG, the oscillation of the sub clock is diagnosed again. If the result is OK, the system enters the test mode. If the diagnosis result is continuously NG 5 times with "ERR1" and "ERR2" displayed.

AUTO • STEREO MANUAL • MONO

Normal indication

50Hz

100Hz

TUNING UP

P. ch UP

50HZ/50µ 100Hz/75µ

the system stops

3-3-2 Aux Test Mode

KEY DISPLAY OPERATION

Tone

DISC 1 Tone MIN

DISC 2 Normal indication AUX LEVEL MAX AUX LEVEL MIN DISC 3 Normal indication Lch MAX Rch MAX CENTER

EX.BASS Normal indication EX. BASE ON EX. BASE OFF

3-3-3 Deck Test Mode

KEY DISPLAY OPERATION

REC/ARM Normal display

* Mechanism SW Detection

HALF SW DISPLAY HALF SW DISPLAY

A PACK SW "T" (The first dot) A CrO2 SW "A" (The second dot) B PACK SW "P" (The third dot) B RVS REC SW "E" (The forth dot)

B FWD SW "T" (The sixth dot) B CrO2 SW "E" (The seventh dot)

A PLAY SW "Moon" (Segment) B PLAY SW Sun(Segment)

MAX MAX MAIN CENTER

Tone CENTE

If the REC/ARM key is pressed, the system record for 4 seconds. Then, it rewinds to the REC starting position and plays back automatically. If the REC/ARM key is pressed, during the 4 seconds REC operation, the system records further for 4 seconds, then returns to the starting position of the first 4 seconds REC operation and plays back.

RXD-303/353/503/553/653/A33/A53

CIRCUIT DESCRIPTION

3-3-4 Test Mode

KEY DISPLAY OPERATION

CD-PLAY/PAUSE 05

(Change the mode alternately by the stop key.) DISC 1 01 : STOP

(Cyclically changed in the 07 stop mode only.) 08

STOP 01 TAPE EQ Ex. 01~02 CD track no. up.

TAPE EQ (Press it more than 400msec.) REVERSE MODE Ex. 02~01 CD track no. down. REVERSE MODE (Press it more t han 400msec.) The pickup travels inward.

05 and 03

09 TO value FO value

CD FF search. The pickup travels outward.

** ** Tracking-servo on.

: Tracking-servo off.

Adjustment value/mean value TB value FB value TG value FG value

Stop (Press it 1time.) Cancel the test mode. (Press it 2 times.)

CD FB search.

4. Microprocessor : M30622MA-A62FP

4-1 Microprocessor Periphery Block Diagram

X28,IC1

DECK SYSTEM IC

(CXA1498S)

X14,IC1 X13,IC101

DOT DRIVER

(LC75711NED)

X14,ED1 X13,IC11

Vaccume Fluorescent

Display (HNA-15MM18T)

X32,IC2

DSP IC

(MN662748)

M30622MA-A62FP

7 X13,IC12 2

DECK MECHA

SYSTEM IC

(M62498AFP)

TUNER PACK

PLL IC

(LC72131)

CD MECHA

(CDM-35)

RDS IC(E, T)

(BU1923F)

RXD-303/353/503/553/653/A33/A53

CIRCUIT DESCRIPTION

4-2 Key Matrix

Input Voltage KEY3 KEY2 KEY1

(V) Pin94 Pin95 Pin97

0.00 0.23 REV. MODE POWER

0.26 0.75 REC EX. BASS DISPLAY/DEMO

0.79 1.29 TAPE EQ. CD PLAY/ PAUSE TUNING MODE

1.33 1.84 OPEN/CLOSE BAND MENU

1.88 2.38 DISC SKIP TAPE B SOUND

2.42 2.93 DISC 3 TAPE A SELECT

2.96 3.45 DISC 2 AUX BACK

3.49 3.98 DISC 1 STOP ENTER

4.01 4.52 – – –

4.54

4.80 KEY OFF KEY OFF KEY OFF

* The input voltage value : for 4.8[V] in a standard voltage

4-3 Pin Description of Microprocessor

Pin No. Pin Name I/O Description

1 SLEVEL I RSD signal level input. 2 CE2 I Backup detection input 2. AC ON AC OFF 3 SD I SD detection input. 4 ST I Stereo detection input. 5 PLL CE O PLL IC chip enable. 6 RDS DATA I RDS data input. 7 PLL CLK O PLL IC clock output. 8 BYTE - GND.

9 CNVSS - GND. 10 XCIN I Timer clock input(32.768kHz). 11 XCOUT O Timer clock output(32.768kHz). 12 RST I Reset signal input. NORMAL RESET 13 X OUT O Main clock output(10MHz). 14 VSS - GND. 15 X IN I Main clock input(10MHz). 16 VCC(BU) - u-com power supply(+5.0V). 17 NMI - Connected to VCC. 18 REM I Signal input of remote control. 19 RDS CLK I RDS clock input. 20 BLKCK I Sub code synchronous signal input. L H Interrupt 21 CE2 I Back up detection input. AC ON AC OFF 22 BEEP SOUND O Beep sound output. 23 PLL DO I PLL IC data input. 24 B EQ O Equalizer control of B deck play back. 25 REC MUTE O Deck recording mute control. MUTE ON 26 R/P O Deck recording/playback changeover control. RECORDING PLAY 27 NOR O B deck Normal/CrO2 changeover control. NORMAL CrO2 28 MCLK O CD DSP command clock signal output. 29 STAT I CD DSP status signal input. 30 MDATA O CD DSP command data output. 31 FL DATA O Data output to VFD dot driver. 32 A CrO2 I A deck CrO2 detection switch input. NORMAL CrO2 33 FL CLK O Clock output to VFD dot driver. 34 FL CE O Chip enable output toVFD dot driver. 35 FL RST O Reset signal output to VFD dot driver. 36 F REC I B deck forward recording prohibition detection switch. 37 B CrO2 I B deck CrO2 detection switch input. CrO2 Normal 38 A PACK I A deck cassette tape detection switch input. 39 A PLAY I A deck head position detection switch input. 40 B PACK I B deck cassette tape detection switch input.

ACTIVE

RXD-303/353/503/553/653/A33/A53

CIRCUIT DESCRIPTION

Pin No. Pin Name I/O Description

41 R REC I B deck reverse recording prohibition detection switch. 42 B PLAY I B deck head position detection switch input. 43 BIAS O Deck bias on/off changeover control. ON OFF 44 BEAT.C O Deck beat cancel on/off changeover control. ON OFF 45 B SOL O B deck solenoid control. 46 CPM O Deck capstan motor control. 47 A SOL O A deck solenoid control. 48 TAPE MUTE O Deck line mute control. MUTE ON 49 A/B O Deck A/B changeover control. B A 50 A EQ O A deck play back equalizer control. 51 MCONT A I Multi control jog input 1. 52 MCONT B I Multi control jog input 2. 53 VOL B I Volume encoder input 2. 54 VOL A I Volume encoder input 1. 55 LED STBY O Control port of standby LED. OFF ON 56 LED TIMER O Control port of timer LED. OFF ON 57 NC - Unused. 58 OPEN SW I CD open detection switch input. 59 CLOSE SW I CD close detection switch input. 60 TD SW I Traverse down switch input port of CD mechanism. 61 TU SW I Traverse up switch input port of CD mechanism. 62 VCC(BU) - u-com power supply(+5.0V). 63 OPEN O CD motor control output. 64 VSS - GND. 65 CLOSE O CD motor control output. 66 BRKM O CD motor control output. 67 RTL O Rotary motor opposite direction(CCW) output. 68 RTR O Rotary motor positive direction(CW) output. 69 DC OFF O Power control of CD DSP IC. ON OFF 70 CD PROT I CD protection input(Only at selector CD). NORMAL PRO. ON 71 SLT SW I CD start limit switch input. 72 MLD O CD DSP command load signal output. 73 SQCK O CD sub code clock output. 74 SUBQ I CD sub code input. 75 D MUTE O CD DSP muting output. 76 XRST O CD DSP IC reset control. RESET 77 PHTR I CD mecha. Stop switch input.

78 PS SW I 79 TU ON/OFF O Tuner power on/off output.

80 A-MUTE O Control port of audio muting. 81 ATT O -10dB attenuation output. ON OFF 82 POWER O Power relay control. 83 SP RELAY O Control port of speaker relay. 84 EV CLK O Clock output to E..volume. 85 EV DATA O Data output to E..volume. 86 EMPHASIS O Tuner emphasis output. 87 EPROM DATA O Expander ROM data output. 88 EPROM CLK O Expander ROM clock output. 89 PROTECT I Detection port of protection. 90 SPEANA I Input port of music signal. 91 TYPE I Discrimination of tuner destination. 92 BPH I B deck reel sensor input. 93 APH I A deck reel sensor input.

94,95 KEY3,KEY2 I A/D key input(key3,key2).

96 AVSS - GND. 97 KEY1 I A/D key input(key1). 98 VREF - A/D reference voltage input. 99 AVCC(BU) - u-com power supply(+5.0V).

100 PLL DATA O PLL IC data output.

Tray position & disc detector switch input port of CD mechanism.

ACTIVE

RXD-303/353/503/553/653/A33/A53

No. ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

AMPLIFIER

SETTINGS

ALIGNMENT

POINTS

ALIGN FOR FIG.

Unless otherwise specified, the individual switches should be set as following : POWER : ON SELECTOR : CD

1 IDLE CURRENT –

Connect a DC

voltmeter to CN3 ( 1 2 ), Lch CN4 ( 3 4 ), Rch

X07, A/2.

VOLUME : 0

VR1 (L)

VR2 (R)

X07, A/2

10 mV (a)

DC voltmeter

10 mV

CN3

(a)

1 2 3 4

(+)L(-)R(+)R(-)

ADJUSTMENT

Amp adjustment RXD-A53(K/P), RXD-503/553(K/P) only

CD player adjustment

1. While pressing the "DISC 3" key, turn the power on to enter the test mode.

2. Load a disc on disc 1 tray.

LASER CURRENT

Note: Type 4 disc : SONY YEDS-18 Test Disc or equivalent. LPF: Around 47 kΩ+ 390 pF or so. Step 1~4 are in Test Mode.

CHECK

SETTINGS

INPUT

Test disc

Type 4

OUTPUT

SETTINGS

Connect the DC

voltmeter to

CN6(pin1 and 2)

on X32.

PLAYER

SETTINGS

Press the

PLAY/PAUSE key,

then confirm that the

display is 03 or 05.

ALIGNMENT

POINTS

ALIGN FOR

– 0.5±0.2V

FIG.No. ITEM

RVS FWD

NO. ITEM INPUT SETTING

OUTPUT

SETTING

CASSETTE TAPE

DECK SETTING

ALIGNMENT

POINTS

ALIGN FOR FIG.

0dBs = 0.775V

I Cassette mechanism unit (Adjustment of the REC / PLAY head)

(1)

Demagnetization

and cleaning

Power : OFF

Demagnetization,

cleaning, PLAY

Recording

head, erase

head, capstan

pinch roller

Demagnetize the REC / PLAY head with the head eraser. Clean the REC / PLAY head, erase head, capstan and pinch roller using a cotton swab slightly damped with alcohol.

(2)

Azimuth of the

REC / PLAY

head

SCC-1727 TCC-153 MTT-114

10kHz, -10dB

(B) PLAY

Adjust the output to maximum and adjust the azimuth adjustment screw for the Lissajours waveform pattern of the oscilloscope to become close to a 45ß straight line.

II PC BOARD ADJUSTMENT

(1)

TAPE SPEED

(NORMAL)

TCC-110 MTT-111

SCC-1727

3kHZ

(B) PLAY VR5

Adjust the tape speed so that 3kHz is obtained at the center of the tape.

III PC board adjustment.

(1)

PLAYBACK

LEVEL

MTT-150

400Hz

(B) PLAY

VR 3 (L)

VR 4 (R)

Adjust the playback output to —2.5dBs.

MTT-256, SCC-1727

315Hz

Adjust the playback output to —5.5dBs.

MTT-256U, TCC-120

315 Hz

Adjust the playback output to —1.5dBs.

(2) BIAS CURRENT

(A) Adjust the AG for the output of the DECK to

become 12.5KHz —20dBs.

400Hz/12.5kHz (AC-224)

(B) REC PLAY

VR 1 (L)

VR 2 (R)

Record 400Hz and 12.5kHz alternately, and adjust the bias current adjustment potentiometer for the playback levels to become the same.

AC 220-

240V~

AC 110- 120V~

GND

ANTENNA

FRONT

SPEAKERS

(

6-16

)

DVD/VIDEO INPUT

SURROUND

SPEAKERS

(

8-16

)

OFF

SURROUND

Oscilloscope

AC voltmeter

Frequency counter

AC voltmeter

{

(A) (B)

X13, CN1

L-PLAY

R-PLAY

GND

Cassette Deck adjustment

RXD-303/353/503/553/653/A33/A53

ADJUSTMENT

Measurement Equipment Connections

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