Sony TC-WE675 - Dual A/r Cassette Deck Manual de usuario

Model Name Using Similar Mechanism TC-WE635

Transport Mechanism Type TCM-230ASR41B

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

STEREO CASSETTE DECK

SPECIFICATIONS

Dolby noise reduction extension manufactured under license

from Dolby Laboratories Licensing Corporation.

HX Pro originated by Bang & Olufsen.“DOLBY”, the double-D

symbol ;and “HX PRO” are trademarks of Dolby Laboratories

Licensing Corporation.

TC-WE675

— Continued on next page —

Ver 1.0 2001.04

Sony Corporation

Home Audio Company

ShinagawaTec Service Manual Production Group

9-873-894-11

2001D0900-1

SERVICE MANUAL

System

Fast-winding time

Approx.100 sec. (with Sony C-60 cassette)

Signal-to-noiseratio (at peak leveland weightedwith Dolby

NR off)

55 dB, using Sony TYPE I cassette

57 dB, using Sony TYPE II cassette

58 dB, using Sony TYPE IV cassette

S/N ratio improvement

With Dolby B NR on:

Approx. 5 dB at 1 kHz, 10 dB at 5 kHz

With Dolby C NR on:

Approx. 15 dB at 500 Hz, 20 dB at 1 kHz

Harmonic distortion

0.4% (using Sony TYPE Icassette):

160 nWb/m 315 Hz, 3rd H.D.)

1.8% (using Sony TYPE IV cassette):

250 nWb/m 315 Hz, 3rd H.D.)

Frequency response (DOLBY NR OFF)

30-16,000 Hz (±3 dB, IEC), 20-17,000 Hz

(±6 dB), using Sony TYPE I cassette

30-17,000 Hz (±3 dB, IEC), 20-18,000 Hz

(±6 dB), using Sony TYPE II cassette

30-19,000 Hz (±3 dB, IEC), 20-20,000 Hz

(±6 dB), 30-13,000 Hz (±3 dB, –4dB recording),

using Sony TYPE IV cassette

Wow and flutter

±0.13% W. Peak (IEC)

0.1% W. RMS (NAB)

±0.2% W. Peak (DIN)

Variable pitch range

Approx. –30 to +30 %

Inputs

Line inputs (phono jacks)

sensitivity 0.16 V, input impedance 47 kilohms

Outputs

Line outputs (phono jacks)

rated output level 0.5 V at a load impedance of

47 kilohms, load impedance over 10 kilohms

Headphones (stereo phone jack)

output level 0.25 mW at a load impedance of

32 ohms

TC-WE675

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE

WITH MARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE

PARTS LIST ARE CRITICAL TO SAFE OPERATION. RE-

PLACE THESE COMPONENTS WITH SONY PARTS WHOSE

PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR

IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

ÀLA SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0SUR LES

DIAGRAMMES SCHÉMATIQUES ET LALISTE DESPIÈCESSONT

CRITIQUES POUR LA SÉCURITÉDE FONCTIONNEMENT. NE

REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY

DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU

DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow-

ing safety checks before releasing the set to the customer:

Checktheantenna terminals,metal trim,“metallized”knobs, screws,

and all other exposed metal parts forAC leakage. Check leakage as

described below.

LEAKAGE

The AC leakage from any exposed metal part to earth Ground and

from all exposed metal parts to any exposed metal part having a

returnto chassis,must not exceed0.5 mA(500 microampers).Leak-

age current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’instructions to use these

instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of aVOM

or battery-operated AC voltmeter. The “limit”indication is 0.75

V, so analog meters must have an accurate low-voltage scale.

The Simpson 250 and Sanwa SH-63Trd are examples of a pas-

sive VOM that is suitable. Nearly all battery operated digital

multimeters that have a 2V AC range are suitable. (See Fig. A)

Fig. A. Using an AC voltmeter to check AC leakage.

0.15µF

To Exposed Metal

Parts on Set

1.5kΩAC

voltmeter

(0.75V)

Earth Ground

General

Power requirements

U.S.A.and Canadian models:

120 V AC, 60Hz

European models:

230 V AC, 50/60Hz

Australian models:

240 V AC, 50/60Hz

Other models:

120/220/230-240 V AC, 50/60Hz

Adjustable with voltage selector

Power consumption

22 watts

Dimensions (w/h/d)

Approx. 430 ×120 ×300 mm

Mass 4.2 kg

Supplied accessories

Audio connecting cords (2)

Control A1II cable (1)*

*Supplied for Canadian models only

Design and specifications are subject to change

without notice.

TC-WE675

PARTSNo. MODEL

4-232-414-0sUS model

4-232-414-1sCND model

4-232-414-2sAEP model

4-232-414-3sUK model

4-232-414-4sSP model

4-232-414-5sAUS model

MODEL IDENTIFICATION

–Back panel–

Part No.

• Abbreviation

CND : Canadian model

SP : Singapore model

AUS : Australian model

TABLE OF CONTENTS

1. GENERAL .......................................................................... 4

2. DISASSEMBLY

2-1. Case ...................................................................................... 5

2-2. Front Panel Assy ................................................................... 5

2-3. Cassette Lid Assy (Deck A/B) .............................................. 6

2-4. Mechanism Deck Assy (Deck A/B) ...................................... 6

3. SERVICE MODE .............................................................. 7

4. MECHANICAL ADJUSTMENTS................................. 8

5. ELECTRICAL ADJUSTMENTS ................................. 8

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 12

6-2. Printed Wiring Board – MAIN Section – ........................... 14

6-3. Schematic Diagram – MAIN (1/4) Section – ..................... 15

6-4. Schematic Diagram – MAIN (2/4) Section – ..................... 16

6-5. Schematic Diagram – MAIN (3/4) Section – ..................... 17

6-6. Schematic Diagram – MAIN (4/4) Section – ..................... 18

6-7. Printed Wiring Board – DECK Section – ........................... 19

6-8. Schematic Diagram – DECK Section – .............................. 19

6-9. Schematic Diagram – LEAF SW Section – ........................ 20

6-10. Printed Wiring Board – LEAF SW Section – ................... 21

6-11. Schematic Diagram – PANEL Section –........................... 22

6-12. Printed Wiring Board – PANEL Section – ........................ 23

6-13. Schematic Diagram – POWER Section – ......................... 24

6-14. Printed Wiring Board – POWER Section – ...................... 25

6-15. IC PIN FUNCTION .......................................................... 26

7. EXPLODEDVIEWS

7-1. Case Section ........................................................................ 27

7-2. Chassis Section ................................................................... 28

7-3. Cassette Holder Section ...................................................... 29

7-4. Front Panel Section ............................................................. 30

7-5. Tape Mechanism Section .................................................... 31

8. ELECTRICAL PARTS LIST ........................................ 32

TC-WE675 SECTION 1

GENERAL

Front Panel

Location of Parts and Controls

1POWER button

2RESET (Deck A) button

3MEMORY (Deck A) button

4RESET (Deck B) button

5MEMORY (Deck B) button

6AUTO REC LEVEL indicator

7REC LEVEL knob

8FADER button

9ARL button

0SYNCHRO button

qa PHONES jack

qs HIGH/NOMAL button

qd A+B REC button

qf DECK B button

qg DECK A button

qh (AMS) M(Deck B) button

qj m(AMS) (Deck B) button

qk H(Deck B) button

ql h(Deck B) button

w; REC z(Deck B) button

wa A(Eject) (Deck B) button

ws REC MUTING W(Deck B) button

wd PAUSE X(Deck B) button

wf x(Deck B) button

wg DOLBY NR B/C switch

wh DOLBY NR OFF/ON FILTER

wj H/FRONT (Deck A) button

wk h/BACK (Deck A) button

wl REC z(Deck A) button

e; REC MUTING W(Deck A) button

ea A(Eject) (Deck A) button

es PAUSE X(Deck A) button

ed x/CLEAR (Deck A) button

ef (AMS) M(Deck A) button RMS +

eg m(AMS) (Deck A) button RMS –

eh DISPLAY button

ej CHECK button

ek SET button

el RMS/START button

r; PITCH CONTROL knob

ra PITCH CONTROL button

rs DIRECTION switch

• AMS is the abbreviation forAutomatic Music Sensor.

1 2 3 4 5 6 7

wdwle;

ws w; ql qk qj qfqg qdqsqhegef wfwjwk

eaed

wges wh

ekel ejeh

TC-WE675

SECTION 2

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. CASE

2-2. FRONT PANEL ASSY

screw

(BVTT 3x6)

two screws

(case 3 TP2)

two screws

(case 3 TP2)

case

screw

(BVTP 3x8)

screw

(BVTP 3x8)

screw

(BVTP 3x8)

two screws

(BVTT 3x6)

claw

front panel assy

CN301

CN401

CN807

CN5802

CN803

CNA806

flat type wire

(Deck A)

CN002

flat type wire

(Deck B)

screw

(BVTP 3x8)

wire

Set Case Front Panel Assy Cassette Lid Assy (Deck A/B) Mechanism Deck Assy (Deck A/B)

• The equipment can be removed using the following procedure.

TC-WE675

2-3. CASSETTE LID ASSY (DECK A/B)

2-4. MECHANISM DECK ASSY (DECK A/B)

four claws

Push the EJECT button.

cassette lid assy

two screws

(BVTP 2.6x8)

mechanism deck assy

two screws

(BVTP 2.6x8)

TC-WE675

RESET 0

MEMORY 1

RMS/START 2

SET 3

CHECK 4

DISPLAY 5

m(AMS) 6

(AMS) M7

x/CLEAR Grid check display (*1)

n/BACK 8

N/FRONT 9

PAUSE XA

REC MUTING Wb

REC zC

DIRECTION MODE switch

sPLAY

RELAY H

A deck side

Button Display

KEY CHECK & DISPLAY CHECK MODE

While pressing the h/BACK (A deck) and REC MUTING W(B deck) buttons with the power off, press the POWER button to turn on

the power.

The fluorescent display tube displays the number or special message corresponding to the button pressed.

The message displayed differs according to the position of the switch.

SECTION 3

SERVICE MODE

RESET 0

MEMORY 1

DECK A 2

DECK B 3

A+B REC 4

HIGH/NOMAL 5

m(AMS) 6

(AMS) M7

xSegment check display (*2)

PAUSE XA

REC MUTING Wb

REC zC

FADER d

ARL E

SYNCHRO All lit

DOLBY NR switch (*3)

OFF h

B PLAY

B deck side

Button Display

Grit check display (*1)

Segment check display (*2)

RMS

(*3) The DOLBY NR switch consists of a pair of switches.

B and C are valid only in the ON or ON FILTER state.

TC-WE675

PRECAUTION

1. Clean the following parts with a denatured alcohol-moistened

swab :

record/playback/erase head pinch roller

rubber belts capstan

idlers

2. Demagnetize the record/playback head with a head demagne-

tizer.

3. Do not use a magnetized screwdriver for the adjustment.

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power sup-

ply voltage unless otherwise noted.

Torque Measurement

SECTION 5

ELECTRICAL ADJUSTMENTS

SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION

1. The adjustment should be performed in the publication.

(Be sure to male playback adjustment at first.)

2. The adjustments and measurement should be performed for both

L-CH and R-CH.

• Switch position

DOLBY NR switch : OFF

DIRECTION MODE switch : g

• Standard record position :

Deliver the standard input signal level to input jack and set the

REC LEVEL knob to obtain the standard output signal level

as follows.

– Record Mode–

0 dBs = 0.775V

Standard Input Level

Test Mode

1. While pressing the H/FRONT (DECK A) and REC MUT-

ING Wbuttons with the power off, press the !button to turn

on the power. The fluorescent display tube lights up for about

one second, and the test mode is set. The test mode performs the

following two special functions.

• Playback speed switching function

Pressing the HIGH/NORMAL button switches the playback

speed between standard/double speed.

• Counter RESET & MEMORY function

Resets the counter when recording starts.When rewound with

the m(AMS) buttonafterrecording, stopsat thepoint where

recording started.

2. To release the test mode, turn OFF the power switch.

Mode Torque meter Meter reading

Forward CQ-102C 30 to 65 g • cm

(0.42 to 0.90 oz • inch)

Forward

back

tension CQ-102C

DECK A : 1 to 6 g • cm

(0.014 to 0.083 oz • inch)

DECK B : 2 to 9 g • cm

(0.028 to 0.125 oz • inch)

Reverse CQ-102RC 30 to 65 g • cm

(0.42 to 0.90 oz • inch)

Reverse

back

tension CQ-102RC 1 to 6 g • cm

(0.014 to 0.083 oz • inch)

FF/REW CQ-201B 70 to 120 g • cm

(0.97 to 1.67 oz • inch)

set –

AF OSC

attenuator 10 kΩ

600 Ω

LINE IN

level mete

LINE OUT

47 kΩ

Standard Output Level

TestTape

Input terminal LINE IN

source impedance 10 kΩ

input signal level 0.5 V (–3.8 dBs)

Input terminal LINE IN

source impedance 10 kΩ

input signal level 0.5 V (–3.8 dBs)

Tape Contents Use

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

P-4-L300 315 Hz, 0 dB PB Level Adjustment

TC-WE675

Record/Playback Head Azimuth Adjustment

DECK A DECK B

Procedure:

1. Forward Playback Mode

2. Turn the adjustment screw for the maximum output levels. If

these levels do not match, turn the adjustment screw until both

of output levels match together within 1 dB.

3. Playback Mode

4. Change the reverse playback mode and repeat the steps 1 to 3.

5. After the adjustment, lock the adjustment screws with suitable

locking compound.

Adjustment Location: –record/playback head –

Tape speed Adjustment DECK A DECK B

Adjust DECK A first

Procedure:

–Forward Playback Mode –

(High speed adjustment)

1. Press the PITCH CONTROL button to set to OFF .

2. Set to test mode. (Refer to page 11.)

3. Press the Hbutton to playback.

4. Press the HIGH/NORMAL button to playback at double speed.

5. Adjust RV316 (DECK A), RV416 (DECK B) so that the fre-

quency counter reading becomes 5,980 ± 80 Hz.

(Normal speed adjustment)

6. Press the Hbutton to playback.

7. Press the HIGH/NORMAL button to playback at normal speed.

8. Adjust RV317 (DECK A), RV417 (DECK B) so that the fre-

quency counter reading becomes 3,000 ± 90 Hz.

(Pitch control adjustment) (DECK A)

9. Press the PITCH CONTROL button to set to ON .

10. Set PITCH CONTROL knob to mechanical center.

11. Press the Hbutton to playback.

12. Adjust RV318 so that the frequency counter reading becomes

2,990 ± 90 Hz.

Adjustment Location: MAIN board (See page 14.)

Sample value of wow and flutter

W.RMS (JIS) less than 0.3% .

(test tape : WS-48B)

Playback Level Adjustment DECK A DECK B

Procedure:

–Forward Playback Mode –

Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and

DECK B : RV121 (L-CH), RV221 (R-CH) so the level meter read-

ing becomes the adjustment limits below.

Adjustment Value:

LINE OUT level : –7.7 dBs ± 0.5 dB (0.301 to 0.338 V)

Level difference between channels : within 0.5 dB

Confirmthatthe LINEOUT leveldoes notchange in playbackmode

while changing the mode from playback to stop several times.

Adjustment Location: MAIN board (See page 14.)

set

test tape

P-4-A100

(10 kHz, –10 dB) level mete

LINE OUT

47 kΩ

within

1 dB within

1 dB

output

level

R-CH

peak

R-CH

peak

L-CH

peak

L-CH

peak

screw

position screw position

Screen Pattern

set

In phase 45˚90˚135˚180˚

good wrong

47 kΩ

L-CH

R-CH

test tape

P-4-A100

(10 kHz, –10 dB)

LINE OUT

oscilloscope

forward sidereverse side

adjustment screws

set

frequency counter

47 kΩ

LINE OUT

test tape

WS-48B

(3 kHz, 0 dB)

set

test tape

P-4-L300

(315 Hz, 0 dB) level mete

LINE OUT

47 kΩ

TC-WE675

Bias Consumption Current Adjustment

DECK A DECK B

This adjustment should be performed when replacing the head assy

or the bias oscillator transformer (T131, T231),(T141, T241).

Setting:

REC LEVEL knob : standard recording position (See page 11.)

Procedure:

1. Connect the digital voltmeter to test point TP331 (DECKA) and

TP441 (DECK B).

2. Set DECK A: RV131 (L-CH), RV231 (R-CH) and DECK B:

RV141 (L-CH), RV241 (R-CH) to mechanical center.

3. Press the Hbutton to playback.

4. Adjust DECK A: T131 (L-CH), T231 (R-CH) and DECK B:

T141 (L-CH), T241 (R-CH) so that the digital voltmeter read-

ing becomes minimum.

Adjustment Value: Maximum 220 mV

Adjustment Location: MAIN board (See page 14.)

Record Bias Adjustment DECK A DECK B

Setting:

REC LEVEL knob : standard record position (See page 11.)

Procedure:

1. Set to test mode (See page 11.)

2. Insert a tape into deck B, press the REC zbutton and then

press the Hbutton to start recording.

Adjustment level:

The palyback output of 10 kHz level difference against 315 Hz ref-

erence should be ± 0.5 dB.

Adjustment Location: MAIN board (See page 14.)

Record Level Adjustment DECK A DECK B

Setting:

REC LEVEL knob : standard record position (See page 11.)

Procedure:

1. Set to test mode (See page 11.)

2. Insert a tspe into deck B, press the REC zbutton and then

press the Hbutton to start recording.

3. Record Mode

4. Playback Mode

set

AF OSC

attenuator 10 kΩ

600 Ω

LINE IN

1) 315 Hz

2) 10 kHz 50 mV (–23.8 dBs)

blank tap

CS-123

3. Record Mode

set

recorded

portion level mete

LINE OUT

47 kΩ

4. Playback Mode

5. Confirm playback the signal recorded in step 2 become adjust-

ment level as follows.

If the selevels do not adjustment level, adjust DECK A: RV131

(L-CH), RV231 (R-CH) and DECK B: RV141 (L-CH), RV241

(R-CH) to repeat steps 3 and 4.

set

AF OSC

attenuator 10 kΩ

600 Ω

LINE IN

blank tap

CS-123

315 Hz, 50 mV (–23.8 dBs)

set

recorded

portion level mete

LINE OUT

47 kΩ

5. Confirm playback the signal recorded in step 2 become adjust-

ment level as follows.

Ifthe selevelsdo not adjustmentlevel, adjust theDECKA:RV102

(L-CH), RV202 (R-CH) and DECK B: RV101 (L-CH), RV201

(R-CH) to repeat steps 3 and 4.

Adjustment Value:

LINE OUT level : –23.8 dBs ± 0.5 dB (47.2 to 53.0 mV)

Adjustment Location: MAIN board (See page 14.)

set

321

blank tape

CS-413

TP331 (DECK A)

TP441 (DECK B)

L-CHR-CH

digital

voltmeter

LINE IN

no signal

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