Fostex VM-08 Service manual

Service Manual

Model

VM08

8ch Digital Mixer with DSP Effects

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 DEC 1999 8288788000

VM08

L

R

INPUT

(-10 ~ -50dBV)

INPUT

(-10 ~ -50dBV)

TRIM

METER

METER

MONO/

STEREO

CH ON

CH ON

GAIN

PAN

GAIN

PAN

POST/PRE

EFF1

EFF2

AUX1

AUX2

A/D

CH1~4

CH5/6 - 7/8

A/D

A/D

LO MID HI

100 1K 10K

ST

L R

EFF

1 2

AUX

1 2

LO MID HI

100 1K 10K

POST/PRE

EFF1

EFF2

AUX1

AUX2

FOOT SW

SCENE UP/DOWN

STEREO ON/OFF

EFF ON/OFF

STEREO MASTER

AUX MASTER

EFF1

EFF2

LO MID HI

100 1K 10K

CH ON

ST MASTER

METER

To DIGITAL OUT

SP_DIF OUT

PHONES VOL

ST BUSS OUT

(-10dBV)

PHONES OUT

(20mW)

AUX 1/2 OUT

(-10dBV)

D/A

D/A

D/A

D/A

EFFECT1

REVERB/DELAY

EFFECT2

MODULATION/DELAY

AUX 1

MASTER

AUX 2

MASTER

EFF1

MASTER

EFF2

MASTER

EFF MUTE

EFF MUTE

“WARNING”

“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO
NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.”

SAFETY INSTRUCTIONS

1. Read instructions - All the safety and operating instructions

2. Retain instructions - The safety and operating instructions

3. Heed warnings - All warnings on the appliance and in the oper-

4. Follow instructions - All operating and use instructions should

5. Water and Moisture - The appliance should not be used near

6. Carts and Stands - The appliance should be used only with a

7. Wall or Ceiling Mounting - The appliance should be mounted to

8. Ventilation - The appliance should be situated so that its lo-

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER (OR BACK).

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

should be read before the appliance is operated.

should be retained for future reference.

ating instructions should be adhered to.

be followed.

water - for example, near a bathtub, washbowl, kitchen sink,
laundry tub, in a wet basement, or near a swimming pool, and
the like.

cart or stand that is recommended by the manufacturer.

An appliance and cart combination shoumRÛbe moved with
care. Quick stops, excessive force, and uneven surfaces
may cause the appliance and cart combination to overturn.

a wall or ceiling only as recommended by the manufacturer.

cation or position does not interfere with its proper ventila­tion. For example, the appliance should not be situated on a
bed, sofa, rug, or similar surface that may block the ventila­tion openings; or, placed in a built-in installation, such as a
bookcase or cabinet that may impede the flow of air through
the ventilation openings.

NO USER-SERVICEABLE PARTS INSIDE.

The lightening flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the user to the presence of uninsulated
“dangerous voltage” within the product's enclo­sure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.

CAUTION:

TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.

ATTENTION:

POUR ÉVITER LES CHOCS ÉLECTRIQUES,
INTRODUIRE LA LAME LA PLUS LARGE DE
LA FICHE DANS LA BORNE CORRE­SPONDANTE DE LA PRISE ET POUSSER
JUSQU' AU FOND.

The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and mainte­nance (servicing) instructions in the literature
accompanying the appliance.

9. Heat - The appliance should be situated away from heat
sources such as radiators, heat registers, stoves, or other ap­pliances (including amplifiers) that produce heat.

10. Power Sources - The appliance should be connected to a
power supply only of the type described in the operating in­structions or as marked on the appliance.

11. Grounding or Polarization - The precautions that should be
taken so that the grounding or polarization means of an appli­ance is not defeated.

12. Power Cord Protection - Power supply cords should be routed
so that they are not likely to be walked on or pinched by items
placed upon or against them, paying particular attention to
cords at plugs, convenience receptacles, and the point where
they exit from the appliance.

13. Cleaning - The appliance should be cleaned only as recom­mended by the manufacturer.

14. Nonuse Periods - The power cord of the appliance should be
unplugged from the outlet when left unused for a long period of
time.

15. Object and Liquid Entry - Care should be taken so that objects
do not fall and liquids are not spilled into the enclosure through
openings.

16. Damage requiring Service - The appliance should be serviced
by qualified service personnel when:
A. The power supply cord or the plug has been damaged;

B. Objects have fallen, or liquid has been spilled into the

C. The appliance has been exposed to rain; or
D. The appliance does not appear to operate normally or

E. The appliance has been dropped, or the enclosure damaged.

17 Servicing - The user should not attempt to service the appli-

ance beyond that described in the operating instructions. All
other servicing should be referred to qualified service personnel.

or

appliance; or

exhibits a marked changed in performance; or

8. BLOCK DIAGRAM

31

3

2

1

AD+5

R351

10KB

ADGND

3

2

1

AD+5

R352

10KB

ADGND

3

2

1

AD+5

R353

10KB

ADGND

3

2

1

AD+5

R354

10KB

ADGND

3

2

1

AD+5

R355

10KB

ADGND

3

2

1

AD+5

R356

10KB

ADGND

3

2

1

AD+5

R357

10KB

ADGND

1234567891011121314151617

<<<<<

<

<

AD+5

AD+5

AD+5

VR0

VR1

VR2

VR3

VR4

VR5

VR6

ADGND

ADGND

ADGND

JOG0

JOG1

DGND

DGND

AD+5

A

B

C

1

2

3

J351

FPC-17P

DGND

DGND

U351

EC12E

ADGND

VM08

VM08

TABLE OF CONTENTS

1. SPECIFICATIONS.................................................................................. 4

2. CONTROLS, INDICATORS AND CONNECTORS.......................... 5

3. SERVICE MODE ................................................................................... 6

REPLACING THE BATTERY ................................................................................ 7

4. EXPLODED VIEW ................................................................................ 8

FLAT CABLE CONNECTIONS.............................................................................. 8

5. PARTS LIST........................................................................................... 9

6. PCB PATTERN DRAWING............................................................... 11

7. CIRCUIT DIAGRAMS ........................................................................ 18

8. BLOCK DIAGRAM............................................................................. 31

NOTES

* Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining

the Model VM08.

* The following accessories are supplied with VM08 as the standard accessories.

Owner's manual : 8288448000
AC adaptor AD-9B : 8270818003 (for USA/CND)

* Following is the packing material for the Model VM08.

PACK, SIDE, L, VM08 : 8228456000

: 8270818006 (for EUR)
: 8270818007 (for UK)
: 8270818010 (for JPN)

PACK, SIDE, R, VM08 : 8228457000
CARTON, INNER, VM08 : 8228732000
CARTON, OUTER, VM08 : 8228911000

FADER (1/1)

30

CAUTION

Parts marked with this sign are safety critical components. They must always be replaced with
identical components. Refer to the Fostex Parts List and ensure exact replacement.

3

VM08

12345678910111213141516171819202122232425

DGND

DGND

CONN-M-25P

DGND

KEY0

KEY1

KEY2

KEY3

KEY4

KEY5

KEY6

KEY7

KEY8

DIG0

DIG1

LED_A0

LED_A1

LED_K0

LED_K1

LED_K2

LED_K3

LED_K4

LED_K5

LED_K6

LED_K7

J252

3

1

KEY[0..8]

DIG0

DIG1

LED_A0

LED_A1

DIG[0..1]LED_A[0..1]

D+5_1

R269

NON

S217

TACT

D209A

DAN202K

KEY8

3 2

13

D+5_1

R261

NON

S201

TACT

ENTER

S216

TACT

FADER ADJ

D201A

DAN202K

D208B

DAN202K

KEY7

3 1

23

D+5_1

R262

NON

S202

TACT

MASTER

S209

TACT

LEVEL ADJ

D201B

DAN202K

D205A

DAN202K

KEY6

3 2

13

D+5_1

R263

NON

S203

TACT

CH7/8

S210

TACT

RECALL

D202A

DAN202K

D205B

DAN202K

KEY5

3

1

23

D+5_1

R264

NON

S204

TACT

CH5/6

S211

TACT

STORE

D202B

DAN202K

D206A

DAN202K

KEY4

3

2

13

D+5_1

R265

NON

S205

TACT

CH4

S212

TACT

EFF1

D203A

DAN202K

D206B

DAN202K

KEY3

3 1

23

D+5_1

R266

NON

S206

TACT

CH3

S213

TACT

EFF2

D203B

DAN202K

D207A

DAN202K

KEY2

3 1

23

D+5_1

R268

NON

S208

TACT

CH1

S215

TACT

EFF/AUX

D204B

DAN202K

D208A

DAN202K

KEY0

3 2

13

D+5_1

R267

NON

S207

TACT

CH2

S214

TACT

PAN/EQ

D204A

DAN202K

D207B

DAN202K

KEY1

EXIT

D256

LED

D263

LED

LED_K1

CH2

PAN/EQ

D255

LED

D262

LED

LED_K2

CH3

EFF2

D254

LED

D261

LED

LED_K3

CH4

EFF1

D253

LED

D260

LED

LED_K4

CH5/6

STORE

D252

LED

D259

LED

LED_K5

CH7/8

RECALL

D251

LED

D258

LED

LED_K6

MASTER

LEVEL ADJ

D265

LED

LED_K7

FADER ADJ

D257

LED

D264

LED

LED_K0

CH1

EFF/AUX

LED_K[0..7]

4

1. SPECIFICATIONS

DEFINITION (Specification Unit : 0 dBV = 1 Vrms)

NORMAL FADER POSITION

Master fader 80 position (Master Fader display)
Input fader 80 position (Channel Fader display)
INPUT 1~4 PAN Fully CCW (L) or CW (R) position
INPUT 5/6, 7/8 PAN Center position

MIXER SECTION

INPUT 1~4

Input Level -50dBV ~ -4dBV
Input Impedance 20kΩ or more
Connector Ø6mm Mono Phone Jack/Unbalanced

INPUT 5/6, 7/8

Input Level -6dBV
Input Impedance 20kΩ or more
Connector Ø6mm TRS Phone Jack/Unbalanced

STEREO OUTPUT (L, R)

Output Level -10dBV
Load Impedance 10kΩ or more
Connector Ø6mm Mono Phone Jack/Unbalanced

AUX SEND 1/2

Output Level -10dBV
Load Impedance 10kΩ or more
Connector Ø6mm TRS Phone Jack/Unbalanced

PHONES OUT

Output Level 30mW MAX (32Ω load)
Load Impedance 16Ω or more
Connector Ø6mm TRS Phone Jack

EQUALIZER

HI (Shelving Type) ±18dB or more (10kHz)
MID (peaking type, Q=1.0) ±18dB or more (1kHz)
LO (Shelving Type) ±18dB or more (100Hz)

FREQUENCY RESPONSE

Input 1~4 (-4dBV) -> Stereo Out (-10dBV) +1, -2dB (20Hz ~ 20kHz)
Input 5~8 (-6dBV) -> Stereo Out (-10dBV) +1, -2dB (20Hz ~ 20kHz)
Input 1~4 (-50dBV) -> Stereo Out (-10dBV) +1, -3dB (20Hz ~ 20kHz)
Input 1~4 (-4dBV) -> Aux Send 1/2 (-10dBV) +1, -2dB (20Hz ~ 20kHz)
Input 5~8 (-6dBV) -> Aux Send 1/2 (-10dBV) +1, -2dB (20Hz ~ 20kHz)
Input 5~8 (-6dBV) -> Phones Out (10mW/16Ω) +1, -3dB (80Hz ~ 10kHz)

S/N (with DAT envelope filter)

Input 1~4 (+8dBV) -> Stereo Out (+2dBV) 86dB or more (IHF-A)
Input 5~8 (+6dBV) -> Stereo Out (+2dBV) 86dB or more (IHF-A)
Input 1~4 (-38dBV) -> Stereo Out (+2dBV) 75dB or more (IHF-A)
Input 1~4 (+8dBV) -> Aux Send 1/2 (+2dBV) 86dB or more (IHF-A)
Input 5~8 (+6dBV) -> Aux Send 1/2 (+2dBV) 86dB or more (IHF-A)
Phones Out Residual Noise (VR : Min) -85dBV or more (IHF-A)

DISTORTION (with DAT envelope filter)

Input 1~4 (+6dBV) -> Stereo Out (0dBV) 0.03% or less (1kHz)
Input 5~8 (+4dBV) -> Stereo Out (0dBV) 0.03% or less (1kHz)
Input 1~4 (-40dBV) -> Stereo Out (0dBV) 0.08% or less (1kHz)
Input 1~4 (+6dBV) -> Aux Send 1/2 (0dBV) 0.03% or less (1kHz)
Input 5~8 (+4dBV) -> Aux Send 1/2 (0dBV) 0.03% or less (1kHz)
Input (0dBV) -> Phones Out (20mW/16Ω) 1.0% or less (1kHz)

CROSSTALK

Input 1~4 (-4dBV) -> Aux Send 1/2 (0dBV)
(Non input channel is measured.) 60dB or more (1kHz)

CLICK NOISE

Power ON/OFF Stereo Out -20dBVp-p or less
Other switching Stereo Out -30dBVp-p or less

SHOCK NOISE -30dBVp-p or less
LEVEL INDICATION

Type LCD Bargraph Meter
Number of Indicated Levels 10dots (-48, -30, -24, -18, -12, -9, -6, -3, -1, OL)
Reference Level (-10dBV) Indication -12dB

DIGITAL SECTION

SAMPLING FREQUENCY 44.1kHz
QUANTIZATION 16 bit linear
A/D CONVERTER 20bit, 64-times Over Sampling, ∆∑
D/A CONVERTER 24bit 128-time, Over Sampling, ∆∑
S/P DIF OUT

Format IEC 60958 (S/P DIF)
Connector Optical

GENERAL

DC IN AD-9B, DC9V, 650mA (Center : Positive)
DIMENSIONS 300 (W) x 212 (D) x 70 (H) mm
WEIGHT Approx. 1.2kg
POWER SUPPLY

USA/CND 120VAC, 60Hz
EUR/UK 230VAC, 50/60Hz
JPN 100VAC, 50/60Hz

* Specifications and appearance are subject to change without notice for product improvement.

Aux Out -20dBVp-p or less
Aux Out -30dBVp-p or less

Tip:Input 5, 7 / Ring:Input 6, 8

Tip:Send 1 / Ring:Send 2

VM08

DISPLAY (2/2) : KEY & LED

29

VM08

ST OUTR

L

PHONES

1

TRIM

2

TRIM

3

TRIM

4

TRIM

-10 -50

-10 -50

-10 -50

-10 -50

RESET

OUT

S/P DIF

DC IN

FOOT SW AUX SEND

INPUT

6/5

8/7

7
8

5
6

1
2

AD-9B
ONLY

9V

3 56421101178 9

SETUP

CLEAR

STORERECALL

SCENE

EFF SEL

EFF1 EFF2

SCENE NO.

MASTERCH

MAX

OL

1
6

12

•

•

24

•

48

-

•

MIN

L

R

EFF/AUX

EQ

E1 E2 A1 A2

PAN LO MID HI

12345678LR

PHONES

LEVEL ADJUST FADER ADJUST

PAN / EQ EFF / AUX

MAXMIN

CH PARAM EDIT

CH ON/CH SEL

MAX

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

MIN

EXIT ENTER

DATA

MASTER7/85/64321

8CH DIGITAL MIXER WITH

DSP EFFECT

1314 1512 16

17
18

19
20

21
22

232524

30

29

28

27

26

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

SEG32

SEG33

SEG34

SEG35

SEG36

SEG37

SEG38

SEG39

SEG40

SEG5

SEG4

SEG3

SEG2

SEG1

COM9

COM10

COM11

COM12

COM13

COM14

COM15

COM16

SEG6

SEG7

SEG8

SEG9

SEG10

SEG16

SEG37

SEG28

SEG29

SEG40

SEG13

SEG18

SEG23

SEG28

SEG33

COM9

COM10

COM11

COM12

COM13

COM7

COM6

COM5

COM4

COM3

COM2

COM1

123456789

101112131415161718192021222324

6463626160595857565554535251504948474645444342

41

SEG22

SEG21

SEG20

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

SEG39

SEG40

COM16

COM15

COM14

COM13

COM12

COM11

COM10

COM9

COM8

COM7

COM6

COM5

COM4

COM3

COM2

COM1

LCD_D7

LCD_D6

LCD_D5

LCD_D4

LCD_D3

LCD_D2

3

2

1

D+5_1

1

2

3

GND

2

1

DGND

D+5_1

D+5_1

DGND

D+5_1

R256

220K

R2551KR2541KR2531KR2521KR251

1K

R257

3K

J251

FPC-17P

W201

DGND

CON2

D-5

D-5

R260

5KB

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

80

79

78

77

76

75

74

73

72

71

70

69

68

67

66

65

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

SEG32

SEG33

SEG34

SEG35

SEG36

SEG37

SEG38

RS

R/W

E

LCD_D0

LCD_D1

C280

0.01

SEG22

SEG21

SEG20

SEG19

SEG18

SEG17

SEG16

SEG15

SEG14

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG6

SEG5

SEG4

SEG3

SEG2

SEG1

GND

OSCI

SEG39

SEG40

COM16

COM15

COM14

COM13

COM12

COM11

COM10

COM9

COM8

COM7

COM6

COM5

COM4

COM3

COM2

COM1

DB7

DB6

DB5

DB4

DB3

DB2

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

SEG32

SEG33

SEG34

SEG35

SEG36

SEG37

SEG38

OSCO

V1

V2

V3

V4

V5

CL1

CL2

VCC

M

D

RS

R/W

E

DB0

DB1

U250

HD44780U

U251

LCD_FD4

1234567891011121314151617

>>>>>>>>>>>

DGND

LCD_D0

LCD_D1

LCD_D2

LCD_D3

LCD_D4

LCD_D5

LCD_D6

LCD_D7ER/WRSD+5

D+5

D+9

DGND

D-5

SEG[1..40]

L202

LAMP

DGND

COM[1..16]

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

SEG22

SEG23

SEG24

SEG25

SEG26

SEG27

SEG28

SEG29

SEG30

SEG31

SEG32

SEG33

SEG34

SEG35

SEG36

SEG37

SEG38

SEG39

SEG40

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

D+9

D+5_2

D+5_2

DGND

D+5_2

D+5_2

R270

NON

R271

0

R272

NON

R273

NON

C283

0.1

C282

0.1

C281

0.1

U252

L78M05T-TL

L201

LAMP

SEG5

SEG4

SEG3

SEG2

SEG1

COM9

COM10

COM11

COM12

COM13

COM14

COM15

COM16

SEG6

SEG7

SEG8

SEG9

SEG10

SEG16

SEG37

SEG28

SEG29

SEG40

SEG13

SEG18

SEG23

SEG28

SEG33

COM9

COM10

COM11

COM12

COM13

COM7

COM6

COM5

COM4

COM3

COM2

COM1

AGND_1DGND

D+9

Vin Vout

U252 R273 R272

R271 R270

D+5_2

D+5_1

D+9

KEY&LED

D+5_1

VM08

2. CONTROLS, INDICATORS AND CONNECTORS

1. DC INLET connector (Center : Positive)

2. S/P DIF optical output connector [Optical]

3. FOOT SW jack [Ø6 mm Phone] (unlatched)

4. RESET switch

5. AUX SEND jack [Ø6 mm TRS Phone]

6. INPUT 7/8 jack [Ø6 mm TRS Phone]

7. INPUT 5/6 jack [Ø6 mm TRS Phone]

8. INPUT 1/2/3/4 jacks [Ø6 mm Phone]

9. TRIM knobs 1/2/3/4

10. Stereo OUTPUT L/R jacks [Ø6 mm Phone]

11. Headphone jack [Ø6 mm TRS Phone]

DISPLAY (1/2) : LCD

28

12. Headphone volume control knob

13. Contrast adjusting knob

14. LCD display

15. SCENE Number display

16. Status indicator

17. SCENE RECALL key

18. SCENE STORE key

19. EFFECT 2 Select key

20. EFFECT 1 Select key

21. ENTER key

22. EXIT key

23. DATA encoder

24. INPUT faders

25. MASTER fader

26. CHANNEL ON/SELECT keys

27. LEVEL ADJUST key

28. FADER ADJUST key

29. PAN/EQ select key

30. EFF/AUX select key

5