JVC TDW-254-BK Service manual

SERVICE MANUAL

DOUBLE CASSETTE DECK

TD-W254BK

Supplement

TD-W254BK

AUTO REVERSE

DOLBY B-C NR HX PRO

B

REC/PLAYBACK

A B SYNCHRO DUBBING

NORM SPEED HIGH SPEED

STANDBY / ON

A

PLAYBACK

DOUBLE CASSETTE DECK

TD-W254

AUTO REVERSE

POWER

ON

STANDBY

INPUT LEVEL

5

COUNTER RESET

REVERSE MODE

DOLBY B NR

OFF C

B

OFF

5

4

3

2

1

PLAY

MIN

PHONES

COUNTER RESET

6

7

8

9

PLAY

MAX

AUTO TAPE SELECTOR / CONTINUOUS PLAY

REC/REC MUTE

PAUSE

Area suffix

J C EN U

The transformer and the circuit board have already been changed in issued model TD-W254BK (No.4363).

Please confirm this SCHEMATIC DIAGRAMS (No.4363BSCH) to the schematic diagram and the circuit board.

Northern Europe

Other Areas

U.S.A

Canada

Please refer to TD-W254BK (No.4363) for the content of the text.

TD-W254BK

VICTOR COMPANY OF JAPAN, LIMITED

PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.4363B)

200107

1

2

3

4

TD-W254BK

5

Block diagram

L

DECK A PB HEAD

DECK B REC/PB HEAD

ERASE HEAD

LINE IN

L

R

L

R

VR111

A PB EQ ADJ

VR211

A PB EQ ADJ

(R)

(L)

VR216

B PB EQ ADJ

-7V -7V

ABC

2 4

VCA

13

515

7

VR601 Input Level

Q1101

Q2101

HS

VR116 B PB EQ ADJ (L)

(R)

L2401 L1401

BIAS ADL

VR246

(R)

REC/PB SELECT

IC845

7

8

B HX PRO

2

VOL.CONTROL

& DD RP

DECK A

PB HEAD AMP

VR212 VR112

DB101

(R) (L)

A PB LEVEL ADJ

IC816

7 9

11

12

10 17

VR146

BIAS ADJ

IC851

4

6

IC811

7

(L)

2

8

3

IC812

PB EQ SWITCH

REC

Q8163

413

B DECK LEVEL ADJ

PB SIGNAL

SELECT

A70

Q8172

HS

B PB

DECK B PB HEAD AMP

4

IC815

7

3

6

VR217

(R)

BIAS DSC

2

L8401

FREQUENCY ADJ

IC818

5.6

2

8

VR117 B PB LEVEL ADJ (L)

Q8491 Q8492

4

Q1152

Q2152

3 8 9

B70

REC AMP

1

IC825

7

REC LEVEL ADJ

Q8481 Q8482

PB O

28

REC IN (L)

3031

IC835 DOLBY NR

PB IN (R)

Q8251

REC MUTE

REC IN

(R)

PB IN (L)

101121

12.13

Q8171

A PB

3

9

VR226

(R)

+B

-B

UT (L)

91522

16

REC OUT (L)

Q2251Q1251

VR126 REC LEVEL ADJ (L)

PB OUT (R)

REC OUT (R)

FL MUTE DI701

HEADPHONES

5

7

IC861

1

3

IC852

LEVEL METER AMP

5

3

Q705

Q706

Q707

L

LINE OUT

R

J8601 H.P.JACK

7

1

IC701

1 2 3 4

G0 G6 5 6 7

9

S1-S16

24

47

METER

48

(R)

METER (L)

~

2-1

TD-W254BK

< MEMO >

2-2

Standard schematic diagrams

Equalizer & headphone amp circuit

470P

150P

C1102

VR111

5

470P

C1101

4.7K

R1102

4.7K

R2102

470P

C2108

C2101

QVP0004-104Z

VR211

4

QVP0004-104Z

VR116

0.001

CN815 CN811

QGF1220F1-06 QGF1220F1-06

330P

C1152

C1151

0.001

C2152

270K

C1455

0.022

C1456

0.039

C2456

0.039

C2151

VR216

QVP0004-104Z

C1452 100P

C2452

100P

330P

C1451

C2451

3

2

R1452

33K

UPC1297CA

100/10

IC845

C8454

1

C8451

R2452

10/25

560P

C1453C1454

R1451

0.01

33K

0.01

C2454

R2451 270K

C2453

560P

C2455

QVP0004-104Z

150P

R1101R2101

C1108

150P

C2102

R1152

R2152

560P/100

1M1M

150P

IC816

4.7k

L1401L2401

QQR0847-001

Q1101

Q2101

C1107

470P

C2107

10P

C8452

C8455

Q8101

22k

R8101

D8101

UPC1330HA

C8151

10/25

R8151

22k

VR146

QVPA601-203AZ

QVP0004-203Z

VR246

100/10

R8102

1/50

C8453

4.7K

R8451

100K

R1453

R2453

C2457

C1457

Q8163

10/25

10

C8101

0.01

C8102

R8152

10/25

150P

C1103

0.01

C1105

220/10

C2105

220/10

C2103

150P

C1153

C1155

QVPA601-101AZ QVP0004-101Z

22K

C2155

C2153

CN845

QGA2512C1-05Z

3K

3.6K

R8452

R8453

D8451

D8452

R1109

15

R2109

15

0.01

150P

220/10

150P

IC815 AN6557F

C1104

0.01

C2104

R1159

R2159

VR212

C1154

0.012

15

C2154

15

0.012

VR112

R2104

R1154

IC811 AN6557F

R1104

270K

R2105

3.3K

270K

VR117

VR217

R1105

3.3K

IC811

R1155

6.8K

R2155

6.8K

R2154

C8491

0.01/100

QQR0845-001

L8401

1K

R8103

QVPA601-101AZ

QVP0004-101Z

R2108

3.6K

AN6557F

IC815

AN6557F

270K

R1158

4.7K

R1165R2165

R2158

4.7K

270K

C1106

4.7/50

R2107

C2106

4.7/50

1M1M

Q1152

Q2152

C8492

2K

47/25

R2106

4.7K

0.022

C8493

C1156

4.7/50

C2156

4.7/50

R8491

R1108

C8152

3.6K

0.01

Q8491

6.8

R1110

R1107

Q8492

R1160

R2160 R1161R2161

2K

R2110

C8494

33K

33K 12K12K

R8492

0.001

R1106

4.7K

0.0015

R8493

C1169

C2169

C8495

33K

C8496

270P

82K

C8481

82K

Q8481

4.7/50

47K

R8104

BU4066BC

IC812

R8481

R1111

R2111

R8482

R8483

R8484

10K

TD-W254BK

Parts are safety assurance parts. When replacing those parts make

IC861

BA15218N

R1601

R1602

120K

R1604

C8601

5.6K

10K

1.8K1.8K

R1603

R1605

12K

R2605

IC861 BA15218N

1K

R8171

15

Q8482

1K

D8481

R2603

C8482

R2602

120K

10K

R8486

100/10

R8485

3.3K

330/25

C8483

C1602

C2602

R2604

5.6K

470

0.0022

R8172

R8471

R8472

R8473

100K

C8602

R2601

1.8K

R8474

22K

R8475

Q8471

CN861

150

0.01

150

BU4066BC

100K

IC818

R8173

1.8K

47K

QGB2003L1-05

Q8171

Q8172

CN862

QGB2003M2-05

0.022

C1601

0.022

C2601

C8901

IC891

0.01

M50253P

J8601 QNS0092-001

J701

QMS3533-V01

sure to use the specified one.

Recording signal Indicator signal P.B signal (Deck A) P.B & H.P signal (Deck B)

CN801

QGF1205C1-06

CN802

QGF1205C1-20

PBIN-L

PBIN-R RECSIG-L RECSIG-R LINEOUT-L LINEOUT-R

NRSW

DUB

NRREC

RECMUTE

MUTE POFF

RESET METER-L METER-R

NS

HS BMETAL BCrO2

VOLSEND VOLRETURN

DDRPSEL

DDRP STBY

11V

7V

5.6V

5V

GND

-7V

-24V

F1

F2

B70

Note:/s/t/T235812AV.001 VDH2358-102AV_1/1

ABCD E F G

2-3