Kenwood XW-320 Service manual

STEREO DOUBLE CASSETTE DECK

STEREO DOUBLE CASSETTE DECK X-W320

0 0

8¶

1 1

DUBBING

NORM. HIGH

O.T.E.

REC LEVEL

MIN MAX

POWER

DOLBY NR CCRS

RESET

REV.

MODE

- ON – OFF

RECINPLAY

OUT

LINE

SYSTEM

CONTROL

AC 110 120V

AC 220 240V

X-W320

SERVICE MANUAL

Cassette lid ass'y (A53-2021-08)

Panel (A60-1287-08)

Front glass (B03-3818-08)

Cassette lid ass'y (A53-2022-08)

Power cord bushing (J42-0336-08)

Phono jack (E11-0369-08)

Miniature phone jack (E11-0188-05)

Slide switch * (S90-0125-08)

AC power cord * (E30-)

* Refer to parts list page on 16.

X-W320

CONTENTS / ACCESSORIES

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

CIRCUIT DESCRIPTION.............................................3

ADJUSTMENT.............................................................6

PC BOARD ..................................................................7

Accessories

Check that the following accessories are present.

SCHEMATIC DIAGRAM..............................................9

EXPLODED VIEW .....................................................14

PATS LIST.................................................................16

SPECIFICATIONS .......................................Back cover

Audio cord ......................(2)

(E30-0505-05)

System control cord........(1)

(E30-2733-05)

* AC plug adapter...........(1)

(E03-0115-05)

* Use to adapt the plug on the

power cord to the shape of the wall outlet (Accessory only for regions where use is necessary.)

CIRCUIT DESCRIPTION

REC MUTE

LINE MUTE PLAY B/A B BIAS B R/P

DATA

CLOCK

STROBE

DOLBY C/B DOLBY ON/OFF LEVEL L LEVEL R

CLK

STROBE

DATA

RESET

LINE MUTE

REC MUTE

SOLB

CPMB

CSPB

B PACK

R REC

F REC

B CrO2

PHB

B PLAY

SOLA

CPMA

CSPA

PHA

A CrO2

A PLAY

A PACK

BIAS NOR

BIAS CRO2

PB AMP

TAPE A TAPE B

DOLBY NR

REC EQ

IC 102

HX-PRO

IC 201

SYSTEM IC

u-COM

IC 101

DRIVER B

DRIVER A

R/P MECHA B PB MECHA A

KEY MATRIX

CMAL2Z078A CMAL2Z077A

1. Microprocessor

1-1 Microprocessor periphery block diagram

X-W320

KEY MATRIX

Pin No. I/O FUNCTION KR0 KR1 KR2 KR3

63 FIP23 SB CW CCW 64 FIP22 SC COUNTER B F.F A REV A STOP A 65 FIP21 SD REW A REV MODE DOLBY FWD A 66 FIP20 SE COUNTER A DUBB HIGH DUBB NOR CCRS 67 FIP19 SF O.T.E PAUSE RECORD STOP B 68 FIP18 SG REW B F.F B REV B FWD B

X-W320

CIRCUIT DESCRIPTION

1-2 Pin description

Pin No. Pin Name I/O Description Action

1~7 G7~G1 O FL tube grid signal output (G7~G1)

8 VDD SUPPLY (+5V)

9 CLK O System IC clock output 10 STB O System IC strobe signal input H 11 DATA O System IC serial data output H/L 12 HXPRO O HX-PRO bias switching L : ON L 13 PLAY B/A O B/A Head switching H : B H/L 14 DOLBY ON O DOLBY ON/OFF H 15 DOLBY C/B O DOLBY C/B H 16 MPX O MPX FILTER OFF/ON L 17 RST I Reset signal input L 18 CPMA O A capstan motor ON H 19 CPMB O B capstan motor ON H 20 AVss GND 21 PHA I A mecha rotation detection L 22 PHB I B mecha rotation detection L 23 A PACK I A tape detection input H 24 B PACK I B tape detection input H 25 A CrO2 I A mecha CrO2 tape detection H 26 B CrO2 I B mecha CrO2 tape detection H 27 LEVEL L I CCRS, DPSS Lch signal input 28 LEVEL R I CCRS, DPSS Rch signal input 29 AVDD ANALOG SUPPLY (+5V) 30 AVREF FOR ADC

31, 32 XT1, XT2 OPEN

33 Vss GND 34 X1 I Clock oscillator 35 X2 I Clock oscillator 36 CSPB O B-Capstan motor speed High/Nor H/L 37 B BIAS O B Bias ON/OFF H : ON H 38 B Mecha R/P O B REC/PLAY switching H : REC H 39 F REC I A-Fool Proof FWD L : REC OK H 40 R REC I A-Fool Proof BWD L : REC OK H 41 CSP A O A-capstan motor speed High/Nor H/L 42 SOLB O B solenoid ON H 43 SOLA O A solenoid ON H 44 EQ SP O 45 S DATA I/O Serial data input output H/L 46 S BUSY I/O Serial busy input output H/L 47 CE I System Stop L 48 IC Connect to VSS 49 LINE MUTE O Line mute control H 50 REC MUTE O Rec mute control H 51 BIAS NORMAL O HX-PRO Bias switching H : NOR H 52 VDD Supply (+5V) 53 B PLAY SW I B-Mecha Mode SW L : PLAY L 54 A PLAY SW I A-Mecha Mode SW L : PLAY L 55 EQ 70/120 O EQ switching H : 70us H 56 OTE O OTE LED Indicator L

57~60 KR3~0 I Key return signal input(KR3~0)

61 70HSP O EQ SP HIGH & BIAS 70us

62~70 SA~SI O FL tube grid signal output(SA~SI)

71 VLOAD FL tube driving voltage(-30V)

72~77 SJ~SO O FL tube segment signal output

78 IC O Supply (+5V) to FL

79,80 G9,G8 O FL tube grid signal output

CIRCUIT DESCRIPTION

2. Initialize

When the mechanism made an irregular action, follow the chart below for initializing.

Commence initializing

Switch ON MTR (Wait for 1 sec.)

X-W320

Yes

Switch ON

"PLAY" SW

Yes

Switch ON SOL

(50 msec.)

Wait for 1 sec.

Switch ON

"PLAY" SW

Switch OFF MTR

Complete initializing

3. Test mode

3-1 Setting method

While pressing the STOP key (A DECK), turn the power switch ON. After turned the power ON, all lights are illuminated for 1.5 seconds and return to normal display with T indication.

3-2 Cancellation

Turn the power switch OFF.

3-3 Contents of the test mode

1) (4 / 8 / 12) seconds recording.

KEYS T(SECONDS)

DECK B STOP 7 + DECK B REC ¶ 4 DECK B STOP 7 + DECK B PAUSE 8 8 DECK B STOP 7 + DOLBY NR 12

REC

T(SEC)

PLAY

RWD

X-W320

RECINPLAY

OUT

LINE

SYSTEM CONTROL

AC 110 120V

AC 220 240V

Oscilloscope

AC voltmeter

Frequency counter

AC voltmeter

{

(A) (B)

1 2

REC/PB UNIT

TP201(L) TP202(R)

GND

R404

To be added a 1kΩ.

R524

Q404

VR502

VR501

(A DECK)

(B DECK)

1KΩ

ADJUSTMENT

No. ITEM

INPUT

SETTINGS

OUTPUT

SETTINGS

CASSETTE TAPE

DECK SETTINGS

ALIGNMENT

POINTS

ALIGN FOR

Unless otherwise specified : each ; switch should be set as follows : TAPE : NORMAL, DOLBY : OFF, INPUT : LINE 0dBs=0.775V

I.Cassette mechanism section (REC/PB head adjustment)

Demagnetize the REC /PB head by head eraser. Clean the REC/PB head, erase head capstan and pinch roller with a cotton swab immersed in alcohol.

Maximize the output and adjust so that the Lissajous figure nears a line slanted 45°.

Demagnetization

[1]

and cleaning

REC/PB head

[2]

azimuth

– –

MTT-114,

TCC-153

SCC-1727

Power OFF, demagnetization,

cleaning play

(B) PLAY

REC/PB

head, erase

head. cap-

stan, pinch

roller

Azimuth

adjustment

screw.

II. Printed circuit board adjustment. Note : First perform the high-speed adjustment.

1. Playback a TEST TAPE

<1>

Tape

speed

(A DECK)

Tape

speed

HIGH

NOR. 3. Disconnect a 1kΩ. NOR. VR402

MTT-111 TCC-100

SCC-1727

HIGH

3kHz, -4dB

TP201

TP202

(B)

2. Connect collector (Q404)/ R404 to GND via1kΩ.

1. Playback a TEST TAPE.

2. Connect collector (Q508) /R524 to GND via 1kΩ.

HIGH VR401

Adjust so that the frequency is 6kHz(HIGH), 3kHz (NOR) at the tape center.

HIGH VR501

(B DECK)

NOR. 3. Disconnect a 1kΩ. NOR. VR502

Playback level

<2>

(A DECK)

Playback level

TCC-130 PLAY

(B DECK)

<3> MPX filter 19kHz, -20dB

REC LEVEL 0dB DOLBY B MODE

VR403(L)

VR404(R)

VR503(L)

VR504(R)

L 203(L)

L 204(R)

775mV

775mV ±2dB

• Adjust the REC LEVEL volume so that the recording monitor output becomes 15mV at 1kHz.

• Record 1kHz and 10kHz alternately.

VR101(L)

VR102(R)

15mV ±1dB

<5> Bias current

1kHz,15mV

10kHz,15mV

TP201(L)

TP202(R)

(B)

• Rewind and playback recorded signal.

• Adjust the REC LEVEL vol-

<4> Recording level 1kHz, 200mV

ume so that the recording monitor output becomes 200mv at 1kHz.

• Record 1kHz.

• Rewind and playback record-

VR201(L)

VR202(R)

Adjust the variable resistors so that a playback level of 200mV ±0.5dB is obtained.

ed signal.

FIG.

(a)

SYSTEM CONNECTIONS (a) AZIMUTH ADJUSTMENT

SCREW

TAPE SPEED(HIGH) TEST POINT

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