Fostex X-24 Service Manual Download Page 23

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X-24

MIXER / JACK PCBs

5. CIRCUIT & BLOCK DIAGRAMS

D103

+VCC

U201B

-VCC

-16dBV

4560

12K

10/16

PHONES OUT

(16ohm 20mW)

PUNCH IN/OUT

DTC314TK

CK PCB (2/2)

HGND

GND

R253

47K

R156

R255 47K

R256

C156

STEREO OUT

-10dBV

R154

U105

DTC314TK

R254

R155

47K

U205

470/10

-10dB

-5dB

0dB

+3dB

+6dB

CH1 BAR GRAPH

-10dB

-5dB

CH2 BAR GRAPH

D106

D107

D104

D105

D203

D204

0dB

+3dB

+6dB

-10dB

-5dB

0dB

CH3 BAR GRAPH

D206

D207

D205

D303

D304

D305

+3dB

+6dB

D306

D307

-10dB

-5dB

0dB

+3dB

+6dB

CH4 BAR GRAPH

D406

D407

D403

D404

D405

H+VCC

R420

12K

C414

10/16

R422 10K

OUT1

OUT2

OUT3

OUT4

OUT5

VCC

GND

AMP

U404

BA6124

R421 5.1K

C415

10/16

-VCC

+VCC

C214 10/16

C314

10/16

R220

12K

R222

10K

R320

12K

R322

10K

OUT1

OUT2

OUT3

OUT4

OUT5

VCC

GND

AMP

U304

BA6124

OUT1

OUT2

OUT3

OUT4

OUT5

VCC

GND

AMP

U204

BA6124

R321 5.1K

R221

5.1K

C215

10/16

C315

10/16

-VCC

C114 10/16

R120

12K

R122

10K

OUT1

OUT2

OUT3

OUT4

OUT5

VCC

GND

AMP

U104

BA6124

R121

5.1K

C115

10/16

-VCC

C153

220P

20KAA

-VCC

R153

47K

U5A

-VCC

C254 22P

C255 10/16

U5B

4556

C256

MASTER

ADER

C250

220P

C251 22P

C252 10/16

C253

220P

R250 68K

R251 12K

R252

24K

U4B

R134B

(+6dB)

(+7.1dB)

-10dBV

C150

220P

C151

22P

C152 10/16

R150

68K

R151 12K

R152

24K

R134A

U4A

4560

+VCC

-10dBV

C154 22P

C155 10/16

4556

+VCC

A.B

-17.1dBV

R116

24K

R117 24K

R133 50KB

U101D

S T

R118

30K

R119

30K

R218 30K

R219

30K

A.B

R216 24K

R217 24K

R233 50KB

U201D

A.B

R316

24K

R317 24K

R333 50KB

U301D

R318

30K

R319

30K

R418

30K

R416

24K

R419 30K

A.B

R417 24K

R433

50KB

U401D

R11

12K

R12

12K

C13

22P

C14

10/16

4560

-VCC

R10

12K

C11

22P

U6A

4560

R127 12K

R227 12K

R327

12K

R427 12K

+VCC

C413 10/16

R415

47K

INPUT

ADER

R413

12K

R431 20KA

U3B

4560

R414 12K

R412 100K

R426

12K

U403

DTC144EK

+VCC

R314 12K

R312 100K

-VCC

R315

47K

R326

12K

U303

DTC144EK

+VCC

-VCC

INPUT

ADER

R313

12K

R331 20KA

U3A

4560

+VCC

C313 10/16

47K

R214 12K

R212

100K

R226

12K

U203

DTC144EK

+VCC

-VCC

C213 10/16

R215

INPUT

ADER

R213

12K

R231 20KA

U2B

4560

-VCC

U101A

INPUT

ADER

(6.0dB)

-16.0dBV

R113

12K

R131 20KA

U2A

4560

R114 12K

R112

100K

+VCC

-VCC

-10dBV

C113

10/16

R115

47K

R126

12K

U103

DTC144EK

+VCC

C109 10/16

R111

12K

D101

1 3

1 2

U101B

R125 47K

D102

R109

30K

+VCC

U102

DTC144EK

-VCC

A.B

C209 10/16

R211

12K

D201

D202

+VCC

REC

1 4

U201A

+VCC

R225

47K

R209

30K

1 2

A.B

U201C

1 4

U301A

+VCC

C309

10/16

U202

DTC144EK

-VCC

REC

1 2

U301B

-VCC

R311 12K

R325

47K

D301

D302

R309

30K

+VCC

U302

DTC144EK

-VCC

U301C

C409

10/16

R411

12K

D401

D402

+VCC

A.B

REC

1 4

U401A

U401B

+VCC

-VCC

R425

47K

R409

30K

1 2

A.B

U401C

U402

DTC144EK

-VCC

R13

47K

C12

220P

U6B

C10 220P

-VCC

47/10

OP SHIELD

47/10

GND

HGND

GND

-VCC

H-VCC

GND

E / D 1

E / D 2

E / D 3

E / D 4

B 1

B 2

B 3

B 4

M U T E

2
1

4567

B 1

B 2

B 3

B 4

E C 1

E C 2

E C 3

E C 4

2
13

T R K 3

T R K 4

T R K 1

T R K 2

T R K 3

T R K 4

SEL

P I T C H

T R K 1

T R K 2

R E C

LED

2
1

6789

1 0

1 1

1 2

1 3

WIDE PITCH

CONTR

(+15% <->

-50%)

R135

10KB

R205

100K

R207

47K

C205

10P

C207

10/16

U1B

2068

C206

10P

H+VCC

SW4

SW1

SW2

SW3

A144EK

U10

A144EK

750

TRIM

(0dB <-> 40dB)

R203

R204

R230B

R230A

100KCC

C203

100/10

C204

100/10

GND

R206

100K

GND

U11

A144EK

U12

A144EK

750

SW5

14K

ohm

INPUT IMP

R310 47K

R410

47K

C308 10/16

C408

10/16

-10dBV

14K

ohm

-10dBV

LINE IN3

LINE IN4

INPUT IMP

-10dBV

14K

ohm

LINE IN2

INPUT IMP

4.3K

J204

R210

47K

C201 NON

MIXER PCB

REC

-10dBV

R105

100K

R107

47K

C105

10P

C107

1 4

TRIM

(0dB <-> 40dB)

R103

R104

C103

100/10

C104 100/10

R130B

R130A

100KCC

R102 12K

INPUT MIC 1/3

(BALANCE)

MIC :12K

ohm

LINE:22K

ohm

INPUT IMP

-10dBV <> -50dBV

CK PCB (1/2)

J102

J101

C101 NON

C102 NON

R101

U1A

2068

+VCC

-VCC

C106

10P

U101C

R106

100K

C202 NON

R201

12K

R202 12K

INPUT MIC 2/4

(BALANCE)

MIC :12K

ohm

LINE:22K

ohm

INPUT IMP

-10dBV <> -50dBV

J202

J201

LINE IN1

R108

J104

R110 47K

C108 10/16

C208

10/16

-10dBV

14K

ohm

INPUT IMP

R208 4.3K

R308

4.3K

R408

4.3K

J304

J404

GND

+VCC

-VCC

HGND

H+VCC

H-VCC

WER LED

+VCC

H+VCC

-VCC

H-VCC

-VCC

TRK1

TRK2

TRK3

TRK4

A.B

REC

LED

750

+VCC

GND

HGND

GND

H-VCC

•

•••

•

Summary of Contents for X-24

Page 1: ...X 24 Service Manual Model multitracker ...

Page 2: ...r against them paying particular attention to cords at plugs convenience recep tacles and the point where they exit from the appliance Cleaning The appliance should be cleaned only as rec ommended by the manufacturer Nonuse Periods The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time Object and Liquid Entry Care should be taken so that obje...

Page 3: ...K DIAGRAMS Owner s manual 8288418000 for export domestic model AC adaptor AD 12A 8270727003 for USA CND 8270727006 for EUR 8270727007 for UK 8270727010 for JPN Adjusting Procedures Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining the Model X 24 NOTES The following accessories are supplied with X 24 as the standard accessories Following is the...

Page 4: ...or RCA pin Output level 10 dBV Load impedance 10 kΩ or more LINE OUT L R Connector RCA pin Output level 10 dBV Load impedance 10 kΩ or more INSERT SEND Connector Stereo phone ring Output level 10 dBV Load impedance 10 kΩ or more Phones Max Output Level 20 mW or more 1 kHz 16 Ω load Level Indication 0 dB is indicated by 5 dot LED bargraph meter when input output level is 10 dBV with the above stand...

Page 5: ...d 3 times from 5 cm height RECORDER SECTION Tape Speed 9 5 cm s 1 5 3000 Hz 45 Hz when reproducing TCW 211 test tape Wow Flutter PLAY 0 25 or less TCW 211 test tape ANSI WTD REC PLAY 0 30 or less AC 514 test tape ANSI WTD Pitch Control MIN PITCH VR Fully CCW 45 or less TCW 211 test tape MAX PITCH VR Fully CW 12 or more TCW 211 test tape Fast Winding Time FF RWD 150 20 sec TAPE C 60 Tape Counter De...

Page 6: ...Hz Input signal 1 kHz 0 dBV standardfader position with 1 kHz BPF Cross Erasure 1 dB or less Input signal 10 kHz 10 dBV standard fader position Measure level difference when adjacent track is put into REC mode Channel Separation 50 dB or more Input signal 1 kHz 10 dBV standard fader position with 1 kHz BPF Measure leakage level when adjacent track is put into REC mode Sync Crosstalk 25 dBV or less...

Page 7: ... B NR REHEARSAL 1 Master fader MASTER 2 Input playback level control faders INPUT PLAYBACK LEVEL 3 Pan pot knob PAN 4 Record track select switches REC SEL 5 Record track LED 6 Level meter 7 Pitch control knob WIDE PITCH 8 Tape counter reset button RESET 9 Cassette lid Cassette tray Top Panel 10 Transport control buttons Play button PLAY Stop button STOP Fast forward button FF Rewind button REW Rec...

Page 8: ... 2 3 4 3 Tape out jacks TAPE OUT 1 2 3 4 4 Dolby B noise reduction on off switch DOLBY NR ON OFF 5 Power switch ON STANDBY 6 DC IN connector DC IN 12V 3 ADJUSTING PROCEDURES With constant use the head surface becomes soiled with magnetic particles from the tape dirt and dust Under such conditions the tape will not always be in smooth contact with the head and thus result in poor performance Less 3...

Page 9: ...own several times close to the head surface On completing the above procedures slowly draw the demagnetizer away from the head and switch it off when it is more than one meter away from the head As demagnetizm in the head cannot be seen unlike the soiled head routine demagnetizing is necessary It is recommended to do so at the same time the head is cleaned 1 2 3 3 2 Test Equipment and Adjusting To...

Page 10: ...ounting legs or vice versa if it is high NOTE Always adjust the head azimuth and phase when the head height is adjusted 3 6 Check and Adjusting of Head Azimuth Switch off the DOLBY SW Connect an AC volt meter to the TAPE OUT and playback the 12 5 kHz section on the TC 284W test tape Rotate the REC PLAY head azimuth adjusting screw to obtain a maximum output level 1 2 3 3 5 Volume SW setting Input ...

Page 11: ...rt and the track to be adjusted is put in REC mode Assuming the track 1 to be adjusted the oscilloscope probe is connected to the test point TP104 on the R P PCB assy and rotate and fix the pot R133 220 kΩ at 60 mV Adjust the remaining tracks in the same way Track 2 Track 3 Track 4 Adjust R233 so that the voltage at TP204 is 60 mV Adjust R333 so that the voltage at TP304 is 60 mV Adjust R433 so th...

Page 12: ...d check if the distortion level is less than 2 1 2 3 3 15 Erasure Measurement Connect a 1 kHz bandpass filter and AC volt meter to TAPE OUT 1 4 and set the controls under the same condition as 3 12 Record a 1 kHz 0 dBV 1 V sine wave signal which is 10 dB higher than the reference recording level on a blank tape Rewind the tape to the start point of recording and advance it by a short length Then r...

Page 13: ...f the AC volt meter reading is within the following specifications DIN AUDIO 47 dB IHF A 55 dB 1 2 3 3 18 1 Reproduce Set the control as follow Dolby B noise reduction on off switch OFF Put a blank cassette tape and start recording without applying a signal Rewind the tape to the start point and play it back Check if the AC volt meter reading is within the following specifications DIN AUDIO 45 dB ...

Page 14: ...C adaptor AD 12A JPN 31 8274 1400 00 PCB assy Regulator X 24 32 8216 6800 00 Sheet isolation X 24 33 8277 4470 15 Cable assy 1P earth lug D3 8MF F L150 Ref No Part No Description 1 8259 0500 00 Head erase X 14 24 2 8259 0520 00 Head R P 4T N LR44RS07 X 24 3 8260 4620 00 Pinch roller assy 4 8260 4630 00 Idler arm assy 5 8260 4640 00 Fly wheel assy 6 8260 4650 00 Motor assy 7 8260 4660 00 F R arm as...

Page 15: ...D VIEW 1 6 4 5 8 7 2 17 18 10 11 16 12 14 15 25 24 28 29 30 26 27 19 20 21 22 23 9 3 BBT 3x8 CZn BBT 3x8 CZn BBT 3x8 CZn BBT 3x8 CZn BBT 3x8 CZn BBT 3x12 BZn BBT 3x8 CZn BBT 3x8 CZn BBT 3x8 CZn 13 32 BBT 3x8 CZn 31 33 BBT 3x8 CZn ...

Page 16: ...16 X 24 X 24 TRANSPORT EXPLODED VIEW ...

Page 17: ...X 24 17 X 24 PCB PATTERN DRAWING MIXER JACK PCBs ...

Page 18: ...18 X 24 R P REGULATOR PCBs ...

Page 19: ...410 8230 1384 73 HT carbon 1 4W 47kΩ 5 R111 411 8230 1381 23 HT carbon 1 4W 12kΩ 5 R112 412 8230 1381 04 HT carbon 1 4W 100kΩ 5 R113 413 8230 1381 23 HT carbon 1 4W 12kΩ 5 R114 414 8230 1381 23 HT carbon 1 4W 12kΩ 5 R115 415 8230 1384 73 HT carbon 1 4W 47kΩ 5 R116 416 8230 1382 43 HT carbon 1 4W 24kΩ 5 R117 417 8230 1382 43 HT carbon 1 4W 24kΩ 5 R118 418 8230 1383 03 HT carbon 1 4W 30kΩ 5 R119 419...

Page 20: ...Description 8274 1340 00 PCB assy Mixer X 24 B001 8251 9681 02 Plain PCB Jack X 24 Ref No Part No Description R101 201 8230 1381 23 Resistor HT carbon 1 4W 12kΩ 5 Ref No Part No Description R102 202 8230 1381 23 Resistor HT carbon 1 4W 12kΩ 5 C101 201 N A C102 202 N A E001 Wire jumper IPS 1041 2 F5 E002 Wire jumper IPS 1041 4 F10 J001 8245 1711 03 Connector PI jack 8283 3P WHT J002 8245 1712 03 Co...

Page 21: ...n 1 4W 24kΩ 5 Ref No Part No Description R102 402 8230 1381 04 HT carbon 1 4W 100kΩ 5 R103 403 8231 5032 23 R TRIM PIT carbon 22kΩ 637T R105 405 8230 1383 94 HT carbon 1 4W 390kΩ 5 R106 406 8231 5034 71 R TRIM PIT carbon 470Ω 637T R107 407 8230 1383 32 HT carbon 1 4W 3 3kΩ 5 R108 408 8230 1381 81 HT carbon 1 4W 180Ω 5 R109 409 8230 1382 22 HT carbon 1 4W 2 2kΩ 5 R110 410 8230 1383 32 HT carbon 1 4...

Page 22: ...tor PL jack RCA 4P YKC21 3115 J005 8245 3080 06 Connector PI jack SBRK 6S 4 J006 8245 3080 13 Connector PI jack SBRK 13S 4 J007 8245 3080 08 Connector PI jack SBRK 8S 4 J008 8245 3080 09 Connector PI jack SBRK 9S 4 J009 010 8245 5280 01 Connector PI jack 1P RT 01T 1 0B J011 8245 3080 04 Connector PI jack SBRK 4S 4 J101 8245 5470 05 Connector PI jack PH 5P WHT J201 8245 5471 05 Connector PI jack PH...

Page 23: ... 1 VCC U101A INPUT FADER 6 0dB 16 0dBV R113 12K 1 2 R131 20KA 2 3 8 4 1 U2A 4560 R114 12K R112 100K VCC VCC 10dBV C113 10 16 R115 47K R126 12K 3 2 U103 DTC144EK VCC C109 10 16 R111 12K D101 1 3 10 1 2 U101B R125 47K D102 R109 30K VCC 3 1 2 U102 DTC144EK VCC A B 4 3 5 C209 10 16 R211 12K D201 D202 VCC REC 2 1 1 4 7 1 3 U201A VCC R225 47K R209 30K 10 11 1 2 PB A B 4 3 5 U201C 1 1 4 U301A VCC C309 10...

Page 24: ... T301 R329 6 2K D VCC 3 1 2 U307 DTC114TK 3 1 2 U408 DTC114TK BIAS ADJ R431 100 R332 1 C325 220P 1 2 3 4 5 U309 1 TP404 BIAS CURR 1 TP305 C326 0 0015 PP 1 2 3 4 5 J301 1 2 3 R333 220KB D VCC AGND BIAS ADJ R432 1 C425 220P 1 2 3 4 5 U409 1 TP405 C426 0 0015 PP 1 2 3 4 5 J401 1 TP1 1 2 3 R433 220KB D VCC BGND AGND C424 2 2 50 R430 10K R434 2 2K R435 2 2K R436 22 1 3 2 L403 1 TP406 OSC LEVEL C428 0 0...

Page 25: ...LINE IN INSERT 10dBV 1 2 3 4 TIP RTN RING SEND TRIM TRIM MIC IN 1 3 10dBV 50dBV REC A B REC PB REC A B REC PB REC A B REC PB REC A B REC PB REC A B REC PB 2 3 1 2 3 1 TIP RTN RING SEND TIP RTN RING SEND TIP RTN RING SEND INPUT FADER INPUT FADER INPUT FADER REC A B REC PB REC A B REC PB REC A B REC PB LINE IN INSERT 10dBV LINE IN INSERT 10dBV LINE IN INSERT 10dBV MIC IN 2 4 10dBV 50dBV ...

Page 26: ...FOSTEX CORPORATION 3 2 35 Musashino Akishima Tokyo Japan 196 0021 FOSTEX CORPORATION OF AMERICA 15431 Blackburn Ave Norwalk CA 90650 U S A PRINTED IN JAPAN JUNE 1998 8288772000 ...

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