Fostex VM88 Service Manual

Service Manual

Model

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 MAR. 2000 8288789000

SAFETY INSTRUCTIONS

Read instructions - All the safety and operating instruc-

tions should be read before the appliance is operated.

Retain instructions - The safety and operating instructions

should be retained for future reference.

Heed warnings - All warnings on the appliance and in the

operating instructions should be adhered to.

Follow instructions - All operating and use instructions

should be followed.

Water and Moisture - The appliance should not be used

near water - for example, near a bathtub, washbowl,

kitchen sink, laundry tub, in a wet basement, or near a

swimming pool, and the like.

Carts and Stands - The appliance should be used only

with a cart or stand that is recommended by the manufac-

turer.

An appliance and cart combination should be moved with

care. Quick stops, excessive force, and uneven surfaces

may cause the appliance and cart combination to over-

turn.

Wall or Ceiling Mounting - The appliance should be

mounted to a wall or ceiling only as recommended by the

manufacturer.

Ventilation - The appliance should be situated so that its

location or position does not interfere with its proper ven-

tilation. For example, the appliance should not be situ-

ated on a bed, sofa, rug, or similar surface that may block

the ventilation openings; or, placed in a built-in installa-

tion, such as a bookcase or cabinet that may impede the

flow of air through the ventilation openings.

Heat - The appliance should be situated away from heat

sources such as radiators, heat registers, stoves, or other

appliances (including amplifiers) that produce heat.

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.

Grounding or Polarization - The precautions that should

be taken so that the grounding or polarization means of

an appliance is not defeated.

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 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

objects do not fall and liquids are not spilled into the en-

closure through openings.

Damage requiring Service - The appliance should be ser-

viced by qualified service personnel when:

A.

B.

C.

D.

E.

Servicing - The user should not attempt to service the ap-

pliance beyond that described in the operating instruc-

tions. All other servicing should be referred to qualified

service personnel.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

TO PREVENT ELECTRIC SHOCK, MATCH

WIDE BLADE OF PLUG TO WIDE SLOT,

FULLY INSERT.

POUR ÉVITER LES CHOCS ÉLECTRIQUES,

INTRODUIRE LA LAME LA PLUS LARGE DE

LA FICHE DANS LA BORNE CORRE-

SPONDANTE DE LA PRISE ET POUSSER

JUSQU' AU FOND.

CAUTION:

ATTENTION:

The exclamation point within an equilateral

triangle is intended to alert the user to the

presence of important operating and mainte-

nance (servicing) instructions in the literature

accompanying the appliance.

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 en-

closure that may be of sufficient magnitude to

constitute a risk of electric shock to persons.

“WARNING”

“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,

DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS-

TURE.”

1.

2.

3.

4.

5.

6.

7.

8.

The power supply cord or the plug has been damaged;

or

Objects have fallen, or liquid has been spilled into the

appliance; or

The appliance has been exposed to rain; or

The appliance does not appear to operate normally or

exhibits a marked changed in performance; or

The appliance has been dropped, or the enclosure

damaged.

9.

10.

11.

12.

13.

14.

15.

16.

17.

43

VM88

VM88 BLOCK DIAGRAM

CH 1

A/D

LO

HI

PRE/POST

GAIN

PAN

EFF 1

10kHz

100Hz

To DIGI OUT

ASP

DIGITAL EFFECT

EFF 1-2

ST MASTER

D/A

D/A

To METER

ST MASTER

PHONES

(100mW)

ST OUT

(-10dBV)

L

R

L

R

EFF

TRIM

EFF 2

AUX 1

AUX 2

CH ON

1kHz

MID

CH5/6

A/D

LO

HI

PRE/POST

GAIN

PAN

EFF 1

10kHz

100Hz

To METER

EFF 2

AUX 1

AUX 2

CH ON

1kHz

MID

A/D

AUX MASTER

D/A

D/A

AUX 1 OUT

(-10dBV)

ST

12

AUX

12

AUX 1

MASTER

AUX 2

MASTER

EFF 1

MASTER

EFF MUTE

LO

HI

10kHz

100Hz

CH ON

1kHz

MID

MONO/STEREO

(SETUP)

CH7/8

CH 2

CH 3

CH 4

AUX 2 OUT

(-10dBV)

To MON

To MON

DIGI OUT

MON

DIGI IN

To METER

From DIGI IN

INSERT

(-10dBV)

TRIM

TRIM

MON SEL

AUX 2

AUX 1

ST

From AUX 1

From AUX 2

From ST

SUB IN

(-10dBV)

MON OUT

(-10dBV)

L (M)

L (M)

R

R

From ST

From CH1-A/D

From CH2-A/D

From CH3-A/D

From CH4-A/D

From CH5-A/D

From CH6-A/D

From CH7-A/D

From CH8-A/D

S/P DIF

ENCODE

ADAT

ENCODE

S/P DIF

ADAT

(SETUP)

DIGI OUT

To DIGI OUT

DIGI IN

(SETUP)

From DIGI IN

CH5 INPUT

(+4dBu~-40dBu)

CH6 INPUT

(+4dBu~-40dBu)

LINE

(+10dBu~-30dBu)

MIC

(-10dBu~-50dBu)

PHANTOM (SETUP)

-48V

DIGI IN

S/P DIF

or

ADAT

DECODE

(SETUP)

To CH1

To CH2

To CH3

To CH4

To CH5

To CH6

To CH7

To CH8

ST OUT

(+4dBu)

L

R

ST OUT

To MON

To DIGI OUT

VM88 VM88

42 3

PLL, DIGITAL, MAIN, VM88

U925 TC9246F

L7

22uH

C27

220/10

C13

0.01

C14

0.01

PGND

D+5

P GND

R978

100

C34

0.47

C15

0.01

R970 1K

R968 22K

R976 4.7 K

C35

15P

C16

0.01

R974

330

R975

750

1

2

3

U917A

74VHC86

4

5

6

U917B

74VHC86

D+5

R979

100

3 14

4 13

5 12

6 11

157

10

2

9

1

U919A

74VHC161

D+5

1

2

3

U920A

74VHC00

4

5

6

U920B 74VHC00

9

10

8

U920C

74VHC00

S

4

D

2

CK

3

R

1

Q

5

Q

6

U923A

74VHC74

S

10

D

12

CK

11

R

13

Q

9

Q

8

U923B

74VHC74

S

10

D

12

CK

11

R

13

Q

9

Q

8

U924B

74VHC74

S

4

D

2

CK

3

R

1

Q

5

Q

6

U924A

74VHC74

S

4

D

2

CK

3

R

1

Q

5

Q

6

U922A

74VHC74

S

10

D

12

CK

11

R

13

Q

9

Q

8

U922B

74VHC74

C31

100P

D+5

DGND

DGND

D+5

D+5

2 3

1

U928

DTA114EK

2

1

3

U929

DTC114EK

R984

10K

R985

10K

D+5

DGNDD+5

D+5

R980

100

D+5

R981

2.2K

C32

100P

DGND

R982

100

14

7

D+5

DGND

14

7

14

7

14

7

14

7

16

8

C17

0.01

C18

0.01

C19

0.01

C20

0.01

C21

0.01

C22

0.01

S

4

D

2

CK

3

R

1

Q

5

Q

6

U921A

74VHC74

D+5

D+5

C33

100P

DGND

DGND

14

7

C23

0.01

LOCK2

R971

1K

R983

10k

D908

1SS 355

R973

100

R972

100

12

13

11

U920D

74VHC00

D+5

S

10

D

12

CK

11

R

13

Q

9

Q

8

U921B

74HC74

L3

EMI

D+5

D+5

L4

EMI

X902

C28

22P

C29

22P

DGND DGND

R986 1

M

3 4

U927B

1 2

U927A

L5

L6

DGND

16

8

R969 NON

C24

0.01

C25

0.01

14

7

56 98 1110 1312

L98

820uH

C36

0.1

DGND

D+5

DGND

MCK

MCK

[DIF]

FS512

FS512

MCK

LRCK

LRCK

DATA_IN

DATA_IN

U927C

74HC04

U927D

74HC04

U927E

74HC04

U927F

74HC04

FCONT2

/PLL1_CONT

/PLL2_CONT

PD1

PD2

FCONT1

FCONT2

/PLL1_CONT

/PLL2_CONT

PD1

PD2

FCONT1

REF

PD

VDDA

AMPI

AMPO

VSSA

XI

XO

VDD

LOCK

S2

S1

M2

M1

CKO

VSS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

22.5792MHz

74VHCU04

74VHCU04

EMI

EXT//INT

EXT//INT

1A

1B

2A

2B

3A

3B

4A

4B

A/B

G

1Y

2Y

3Y

4Y

2

3

5

6

11

10

14

13

1

15

4

7

9

12

U926A

74VHC157

EMI

U917E

VCC

GND

74VHC86

U919B

VCC

GND

74VHC161

U920E

VCC

GND

74VHC00

U921C

VCC

GND

74VHC74

U922C

VCC

GND

74VHC74

U923C

VCC

GND

74VHC74

U924C

VCC

GND

74VHC74

U926B

VCC

GND

74VHC157

U927G

VCC

GND

74VHCU04

2. MAIN_D, CPU

1. MAIN_D, ROOT

3. MAIN_D, DSP_ROOT

7. MAIN_D, GA_DIF

4. MAIN_D, DSP1 2

5. MAIN_D, DSP3

6. MAIN_D, DSP SEL

8. MAIN_D, PLL

SPDIF//ADAT

LOCK2

SPDIF//ADAT

A

B

C

D

ENP

ENT

CK

LOAD

CLR

QA

QB

QC

QD

RCO

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.

CAUTION

TABLE OF CONTENTS

Owner's manual : 8288458000 (for export & domestic model)

Service mode, exploded view, PCB assembly, parts list and circuit diagrams are given in this manual

to assist the service technician in maintaining the Model VM88.

NOTES

The following accessories are supplied with VM88 as the standard accessories.

*

*

Following is the packing material for the Model VM88.

*

Carton, inner, VM88 : 8228737000

Packing, side, L, VM88 : 8228465001

Packing, side, R, VM88 : 8228465002

1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .

5. CIRCUIT AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . .

4

6

7

10

23

!

VM88 VM88

4 41

1. SPECIFICATIONS

Specification Unit 0 dBV = 1 Vr.m.s., 0 dBu = 0.775 Vr.m.s.

Standard Input

INPUT 1 ~ 4

Connector XLR Cannon (MIC)

Ø 6 mm TRS phone jack (LINE)

Input level -50 dBu ~ -10 dBu (MIC)

-30 dBu ~ +10 dBu (LINE)

Input impedance 3 kΩ or more (MIC)

10 kΩ or more (LINE)

INPUT 5 - 8

Connector Ø 6 mm TRS phone jack

Input level -40 dBu ~ +4 dBu

Input impedance 10 kΩ or more

INSERT 1 - 4

Connector Ø 6 mm TRS phone jack

Input level -10 dBV

Input impedance 10 kΩ or more

MON IN L, R

Connector Ø 6 mm TRS phone jack

Input level -10 dBV

Input impedance 10 kΩ or more

DATA IN

Connector Square shape optical

Format

S/P DIF IN IEC consumer optical standard (IEC 958 Part 3)

ADAT IN Alesis Proprietary Multichannel Optical Digital Interface

Standard Output

STEREO OUT L, R

Connector XLR Cannon

Ø 6 mm TRS phone jack

Output level +4 dBu (XLR Cannon)

-10 dBV (Ø 6 mm TRS phone jack)

Load impedance 10 kΩ or more (XLR Cannon & Ø 6 mm TRS phone jack)

AUX SEND 1, 2

Connector Ø 6 mm TRS phone jack

Output level -10 dBV

Load impedance 10 kΩ or more

MON OUT L, R

Connector Ø 6 mm TRS phone jack

Output level -10 dBV

Load impedance 10 kΩ or more

PHONES OUT L, R

Connector Ø 6 mm TRS phone jack

Output level 50 mW or more

Load impedance 32 Ω

DATA OUT

Connector Square shape optical

Format

S/P DIF OUT IEC consumer optical standard (IEC 958 Part 3)

ADAT OUT Alesis Proprietary Multichannel Optical Digital Interface

EQ

HI 10 kHz ± 18 dB (shelving type)

MID 1 kHz ± 18 dB (peaking type)

LO 100 Hz ± 18 dB (shelving type)

Fader (VR) Position at Standard Input / Output

Input Fader 80 position

INPUT 1 ~ 4 (TRS) +10 dBu, 1 kHz

DIGITAL I/F, DIGITAL, MAIN, VM88

C6

0.01

C7

0.01

C8

0.01

DGND

D+5

C30

100P

C9

0.01

C10

0.01

C26

10/16

//

R964

100

R965

100

2

4

6

87

5

3

1

R967

DGND

C11

0.01

C12

0.01

U918

GA_DIF

R966

100

5 6

U903C

12

13

11

U913D

9

10

8

U914C

R40

47

C44

100P

DGND

R41

100

TDO_FS0O

TDO_EMPO

PI

PO

TEST1

TEST2

VDD

A4

A3

A2

A1

A0

WR

RD

VSS

CS

RESET

D0

D1

D2

D3

D4

D5

D6

D7

CTL_PIN

VDD

VSS

EN_IF

SINA_MD

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

PD2

MCK2

VSS

PLL1_CONT

LOCK1

FCONT1

PD1

MCK1

DO_SEL0

DO_SEL1

ADAT_MD

DO2

DO1

DO_EMPI

VSS

VDD

DO_FS0I

DO_FS1I

SOUT_DI

SOUT2_78

SOUT2_56

SOUT2_34

SOUT2_12

VSS

SOUT1_78

SOUT1_56

SOUT1_34

SOUT1_12

DI_EMPO

DI_FS0O

80

79

78

77

76

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

TDO_FS1O

W_OUT

W_IN2

W_IN1

FS256O

BCKO

LRCKO

LRCKI

BCKI

VDD

VSS

FS256I

PCMBW0

PCMBW1

CK_SEL0

CK_SEL1

CK_SEL2

PLL2_CONT

LOCK2

FCONT2

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

SOUT1_MD

SOUT2_MD

TDI_FS1I

TDI_FS0I

TDI_EMPI

SINA_12

SINA_34

SINA_56

SINA_78

VSS

VDD

SINB_12

SINB_34

SINB_56

SINB_78

SIN_DIF

DI1

DI2

DI_SEL

DI_FS1O

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

ADO1

ADO2

ADO3

ADO4

ADOA

ADO2

ADO3

ADO4

A4

A3

A2

A1

A0

D0

D1

D2

D3

D4

D5

D6

D7

SPDIF//ADAT

/PLL2_CONT

LOCK2

FCONT2

PLL

LRCK

LRCK

DATA_IN

SPDIF//ADAT

DATA_IN

SPDIF//ADAT

/PLL2_CONT

LOCK2

FCONT2

pll.sch

PD1

FCONT1

MCK

/PLL1_CONT

PD2

PD1

FCONT1

MCK

/PLL1_CONT

PD2

EXT//INT

FS512

EXT//INT

FS512

EXT//INT

FS512

DATA_OUT

SPDIFOUT

DATA_OUT

SPDIFOUT

SOUT_78

SOUT_56

SOUT_34

SOUT_12

SOUT_78

SOUT_56

SOUT_34

SOUT_12

100 X 4

DATA_IN

DATA_IN

STOUT

ADO[1...4]

STOUT

ADO[1...4]

/RST_DIF

/CS_DIF

/RD_DIF

/WR_DIF

CPU> D[0...7]

CPU>

CPU>

CPU>

CPU>

/RST_DIF

/CS_DIF

/RD_DIF

/WR_DIF

D[0...7]

A[0...4]

CPU>

A[0...4]

/LRCK

/LRCK

BCK

BCK

FS256

FS256

LRCK

74VHC00

74VHC00

74VHC14

2. MAIN_D, CPU

1. MAIN_D, ROOT

3. MAIN_D, DSP_ROOT

7. MAIN_D, GA_DIF

4. MAIN_D, DSP1 2

5. MAIN_D, DSP3

6. MAIN_D, DSP SEL

8. MAIN_D, PLL

VM88 VM88

40 5

DSP SELECT, DIGITAL, MAIN, VM88

1

2

3

4

5

6

9

10

8

12

13

11

14

7

9

10

8

14

7

1

2

3

12

13

11

1

2

3

4

5

6

SO

14

7

1

2

13

12

1

2

3

4

5

6

9

10

8

3

4

5

6

12

13

11

4

5

6

9

10

8

12

13

11

14

7

C1

0.01

C2

0.01

C3

0.01

C4

0.01

C5

0.01

14

7

D+5

D+5

DGND

R961

100

D+5

R962 100

R963 100

9

10

11

8

D+5

SO_DSP

SO_DSP

CPU (SBIO P19)<

CPU (SBTO P20)>

SCK_DSP

SCK_DSP

CPU (SBIO P18)> SI_DSP

SELECTOR

SI_DSP

SI_DSP

74VHC00

U912D

74VHC00

U912C

74VHC00

U912B

74VHC00

U912A

74VHC00

U913A

74VHC00

U913B

74VHC00

U913C

74VHC10

U916A

74VHC00

U915A

74VHC00

U915D

74VHC00

U915C

74VHC00

U914B

74VHC00

U914A

74VHC00

U914D

74VHC10

U916C

74VHC10

U916B

74VHC00

U915B

74VHC86

U917C

74VHC86

U917D

DRDY_DSP

DRDY_DSP

WRDY_DSP

WRDY_DSP

DRDY_DSP1

DRDY_DSP2

DRDY_DSP3

WRDY_DSP1

WRDY_DSP2

WRDY_DSP3

WRDY_DSP[1...3]

DRDY_DSP[1...3]

U915E

74VHC00

VCC

GND

U914E

74VHC00

VCC

GND

U913E

74VHC00

VCC

GND

U912E

74VHC00

VCC

GND

U916D

74VHC00

VCC

GND

SCK_DSP1

SCK_DSP2

SCK_DSP3

SCK_DSP[1...3]

SO_DSP[1...3]

SCK_DSP[1...3]

SO_DSP[1...3]

SO_DSP2

SO_DSP3

SO_DSP1

SEL1

SEL2

SEL3

SEL[1...3]

WRQ_DSP

RST_DSP

SEL[1...3]

WRQ_DSP

RST_DSP

SEL1

SEL2

SEL3

/WRQ_DSP1

/WRQ_DSP2

/WRQ_DSP3

/WRQ_DSP[1...3]

/WRQ_DSP[1...3]

/RST_DSP[1...3]

/RST_DSP[1...3]

/RST_DSP1

/RST_DSP2

/RST_DSP3

DRDY

WRDY

/RST_DSP

/WRQ_DSP

SEL1

SEL2

SEL3

2. MAIN_D, CPU

1. MAIN_D, ROOT

3. MAIN_D, DSP_ROOT

7. MAIN_D, GA_DIF

4. MAIN_D, DSP1 2

5. MAIN_D, DSP3

6. MAIN_D, DSP SEL

8. MAIN_D, PLL

DRDY_DSP[1...3]

WRDY_DSP[1...3]

Fader (VR) Position at Standard Input / Output (continued)

INPUT 5 ~ 8 (TRS) +4 dBu, 1 kHz

PAN L (R)

Master Fader Adjust so that ST OUT level is at -10 dBV. ( ST OUT SW: ON)

INPUT 1 ~ 4 (TRS) +10 dBu, 1 kHz

INPUT 5 ~ 8 (TRS) +4 dBu, 1 kHz

PAN L (R)

MON OUT VR Adjust so that MON OUT level is at -10 dBV. (ST OUT SW: ON,

MON SEL SW: ST)

INPUT 1 ~ 4 (TRS) +10 dBu, 1 kHz

INPUT 5 ~ 8 (TRS) +4 dBu, 1 kHz

PAN L (R)

MON IN VR Adjust so that MON OUT level is at -10 dBV. (ST OUT: ON,

MON SEL: ST)

INPUT 1 ~ 4 (TRS) +10 dBu, 1 kHz

INPUT 5 ~ 8 (TRS) +4 dBu, 1 kHz

PAN L (R)

Output Level

INPUT 1 ~ 8

→→

→→

→ STEREO OUT -10 dBV ± 2 dB

INPUT 1 ~ 8

→→

→→

→ MONITOR OUT -10 dBV ± 2 dB

Frequency Response

INPUT 1 ~ 8

→→

→→

→ STEREO OUT / MONITOR OUT / AUX SEND

INPUT 1 ~ 4 20 Hz ~ 20 kHz +1, -3 dB (LINE level)

INPUT 1 ~ 4 20 Hz ~ 20 kHz +1, -3 dB (MIC level)

INPUT 5 ~ 8 20 Hz ~ 20 kHz +1, -3 dB (LINE level)

INPUT 1 ~ 8

→→

→→

→ PHONES OUT

INPUT 1 ~ 4 30 Hz ~ 20 kHz +1, -3 dB (LINE level)

INPUT 1 ~ 4 30 Hz ~ 20 kHz +1, -3 dB (MIC level)

INPUT 5 ~ 8 30 Hz ~ 20 kHz +1, -3 dB (LINE level)

T.H.D. (w/ distortion filter NF3346A, 3347 or equivalent)

INPUT 1 ~ 8

→→

→→

→ STEREO OUT / MONITOR OUT / AUX SEND

INPUT 1 ~ 4 (0 dBu, XLR) 0.03 % or less

INPUT 1 ~ 4 (-40 dBu, XLR) 0.05 % or less

INPUT 1 ~ 4 (+20 dBu, TRS) 0.03 % or less

INPUT 1 ~ 4 (-20 dBu, TRS) 0.05 % or less

INPUT 5 ~ 8 (+14 dBu, TRS) 0.03 % or less

INPUT 5 ~ 8 (-30 dBu, TRS) 0.05 % or less

S/N (w/ distortion filter NF3346A, 3347 or equivalent)

INPUT 1 ~ 8

→→

→→

→ STEREO OUT / MONITOR OUT

INPUT 1 ~ 8 (LINE level, XLR) 90 dB or more

INPUT 1 ~ 4 (MIC level, XLR) 78 dB or more

INPUT 5 ~ 8 (MIC level, TRS) 86 dB or more

INPUT 1 ~ 8

→→

→→

→ AUX SEND

INPUT 1 ~ 8 (LINE level, XLR) 90 dB or more

INPUT 1 ~ 4 (MIC level, XLR) 78 dB or more

INPUT 5 ~ 8 (MIC level, TRS) 86 dB or more

Mic Gain

INPUT 1 ~ 4 40 dB ± 3 dB

INPUT 5 ~ 8 44 dB ± 3 dB

Crosstalk 60 dB or more at 1 kHz (50 dB or more at PHONES OUT)

Click Noise

POWER ON / OFF -20 dB p-p or less

Other switching -30 dB p-p or less

Shock Noise -30 dBVp-p

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

“Adat” and symbol are trademarks of Alesis Corporation.

OPTICAL

VM88 VM88

6 39

2. CONTROLS, INDICATORS AND CONNECTORS

1. Input connector [

MIC (2: HOT) / LINE

]

2. AUX send jack [

AUX SEND 1, 2

]

3. Stereo out connector [

ST OUT L (2: HOT),

R (2: HOT) BAL / +4dBu / L, R UNBAL / -10dBV]

4. Stereo out ON/OFF switch [

OFF / ON

]

5. Monitor in jack [

MON IN L (MONO), R

]

6. Monitor out jack [

MON OUT L (MONO), R

]

7. Foot switch connecting jack [

FOOT SW

]

8. Headphone jack [

PHONES

]

9. Monitor out adjusting knob [

GAIN -

∞ / +6 [dB]]

10. Headphone volume [

MIN / MAX

]

11. Monitor input adjusting knob [

GAIN -

∞ / +6 [dB]]

12. Monitor select switch [

ST / AUX1 / AUX2

]

13. Scene Recall key [

SCENE RECALL /

DIRECT RCL

]

14. Scene Store key [

SCENE STORE

]

15. Effect 2 key [

EFF EDIT EFF1 /

MUTE

]

16. Effect 1 key [

EFF EDIT EFF2 /

MUTE

]

17. Enter key [

ENTER

]

18. Exit key [

EXIT

]

19. Data encoder [

DATA

]

20. Phantom LED [

PHANTOM

]

21. Master fader [

MASTER

]

22. Input fader [

1, 2, 3, 4, 5/6, 7/8

]

23. PAN/EQ select key [

PAN/EQ

]

24. EFF/AUX select key [

EFF/SEL

]

25. Fader adjust key [

FADER ADJUST

]

26. Channel On/Channel select key [

CH ON/CH SEL

]

27. Level adjust key [

LEVEL ADJUST

]

28. Contrast adjusting knob [

]

29. Display/status/meter section

30. TRIM knob

[

LINE +10/-30 [dBu] / MIC -10 / -50 [dBu]

]

31. Input jack 5 ~ 8 [

INPUT 5, 6, 7, 8

]

32. Insert jack 1 ~ 4 [

INSERT 1, 2, 3, 4

]

1

2

3

45

3

67

8

9

10

11

12

13

14

15

16

17

18

22 21

20 19

26

25

24

23

30

29

28

27

1

32

31

< Top Panel Section >

DSP3, DIGITAL, MAIN, VM88

[ANA]

[ANA]

[ANA]

[ANA]

330

330

330

330

C994

1500P

C993

1500P

U910

32

24 30

6

5

8

U911

C999

10/

16

C995

0.01

D+5

DGND

D+5

DGND

/WE

R958

100

R957 100

R960

100

EFFA8

EFFA9

EFFA10

EFFA11

EFFA12

EFFA13

EFFA14

EFFA15

EFFA16

C992

0.1

C991

10/16

C975

0.1

C983

0.1

R959

10

C987

10/16

C988

0.1

AGND

A+5

AGND

AGND

C982

0.01

C979

0.01

C978

0.01

C976

0.01

C981

10/16

AD+5

DGND

C980

0.01

C989

10/16

C990

0.1

C996 47P

C997 47P

C998 NON

DGND

AUX_B

ST_OUT

TESTI1

/INIT_RESET

/CODEC_RESET

/DSP_RESET

SMUTE

DVB

SDINA

SDOUTA

SDOUTD1

SDIND1

SDIND2

SDOUTD2

SDOUT1

SDOUT2

SDIN1

SDIN2

LRCK

BITCLK

CLKO

CTRL

DVDD

DVSS

OPCL

XTI

XTO

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

AINL+

AINL-

AINR+

AINR-

VRADH

AVDD

AVSS

VRADL

VCOM

ARDAH

AVDD

AVSS

VRDAL

NC

AOUTL1+

AOUTL1-

NC

AOUTR1+

AOUTR1-

NC

AOUTL2+

AOUTL2-

NC

AOUTR2+

AOUTR2-

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

80

79

78

77

76

EECS

EESK

EEDI

EEDO

DVB

DVDD

DVSS

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0

/OE

A16

A15

A14

A13

A12

A11

A10

A9

A8

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

SMODE

EESEL

JX

/RQ

SCLK

SI

SO

RDY

DRDY

EEST

DVSS

DVDD

/CAS

/RAS

/WE

A0

A1

A2

A3

A4

A5

A6

A7

DVSS

DVDD

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

DSP3

EFFECT

AK7716

EFFA0

EFFA1

EFFA2

EFFA3

EFFA4

EFFA5

EFFA6

EFFA7

EFFA[0...16]

EFFA0

EFFA1

EFFA2

EFFA3

EFFA4

EFFA5

EFFA6

EFFA7

EFFA8

EFFA9

EFFA10

EFFA11

EFFA12

EFFA13

EFFA14

EFFA15

EFFA16

20

19

18

17

16

15

14

13

3

2

31

1

12

4

11

7

10

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

A15

A16

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

21

22

23

25

26

27

28

29

VCC

VSS

/OE

/WE

CE2

/CE1

TC551001CFT-70L

EFFD0

EFFD1

EFFD2

EFFD3

EFFD4

EFFD5

EFFD6

EFFD7

EFFD7

EFFD6

EFFD5

EFFD4

EFFD3

EFFD2

EFFD1

EFFD0

/OE

EFFD[0...7]

STOUT_L+

STOUT_L-

STOUT_R+

STOUT_R-

STOUT_L+

STOUT_L-

STOUT_R+

STOUT_R-

AUXSEND_BL+

AUXSEND_BL-

AUXSEND_BR+

AUXSEND_BR-

AUXSEND_BL+

AUXSEND_BL-

AUXSEND_BR+

AUXSEND_BR-

AIN6+

AIN5-

AIN6-

AIN5+

AIN6+

AIN5-

AIN6-

AIN5+

R954

R955

R953

R956

/INIT_RST

/CODEC_RST

/TST_DSP3

SPDIFOUT

ADO3

ST_B

EFF_A

EFF_B

/LRCK

BCK

AUX_B

STOUT

FS512

ST_B

EFF_A

EFF_B

/LRCK

BCK

FS512

/INIT_RESET

/CODEC_RST

/RST_DSP3

SPDIFOUT

ADO3

/WRQ_DSP3

SCK_DSP3

SI_DSP3

SO_DSP3

WRDY_DSP3

DRDY_DSP3

/WRQ_DSP3

SCK_DSP3

SI_DSP3

WRDY_DSP3

DRDY_DSP3

SI_DSP3

2. MAIN_D, CPU

1. MAIN_D, ROOT

3. MAIN_D, DSP_ROOT

7. MAIN_D, GA_DIF

4. MAIN_D, DSP1 2

5. MAIN_D, DSP3

6. MAIN_D, DSP SEL

8. MAIN_D, PLL

VM88 VM88

38 7

DSP1 & 2, DIGITAL, MAIN, VM88

AIN1+

AIN1-

AIN2+

AIN2-

C932

0.01

C935

0.01

C937

0.01

C933

0.01

C936

10/16

AD+5

DGND

C947 0.1

C946

10/16

C931

0.1

C938

0.1

AIN2-

AIN2+

AIN1-

AIN1+

R943

100

[ANA]

[ANA]

[ANA]

[ANA]

R951

10

R935 330

R936 330

R937 330

R938 330

C949

1500P

C948

1500P

C942

10/16

C943

0.1

C934

0.01

AGND

C945

0.1

C944

10/16

2

4

6

87

5

3

1

R944

100

X

4

C956

0.01

C953

0.01

C952

0.01

C951

0.01

C955

10/16

AD+5

DGND

R947

100

[ANA]

[ANA]

[ANA]

[ANA]

330

330

330

330

C968

1500P

C967

1500P

C954

0.01

A+5

AGND

AGND

C966 0.1

C965

10/16

C950

0.1

C957

0.1

R952

10

C961

10/16

C962

0.1

AGND

C964

0.1

C963

10/16

A+5

AGND

AGND

L2

R945

100

R946

100

C969 47P

C970 47P

C971 NON

DGND

C972 47P

C973 47P

C974 NON

DGND

AUX_A

2

4

6

87

5

3

1

R950

100X 4

TESTI1

/INIT_RESET

/CODEC_RESET

/DSP_RESET

SMUTE

DVB

SDINA

SDOUTA

SDOUTD1

SDIND1

SDIND2

SDOUTD2

SDOUT1

SDOUT2

SDIN1

SDIN2

LRCK

BITCLK

CLKO

CTRL

DVDD

DVSS

OPCL

XTI

XTO

EECS

EESK

EEDI

EEDO

DVB

DVDD

DVSS

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0

/OE

A16

A15

A14

A13

A12

A11

A10

A9

A8

AINL+

AINL-

AINR+

AINR-

VRADH

AVDD

AVSS

VRADL

VCOM

ARDAH

AVDD

AVSS

VRDAL

NC

AOUTL1+

AOUTL1-

NC

AOUTR1+

AOUTR1-

NC

AOUTL2+

AOUTL2-

NC

AOUTR2+

AOUTR2-

SMODE

EESEL

JX

/RQ

SCLK

SI

SO

RDY

DRDY

EEST

DVSS

DVDD

/CAS

/RAS

/WE

A0

A1

A2

A3

A4

A5

A6

A7

DVSS

DVDD

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

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

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

80

79

78

77

76

DSP1

U908

AK7716

/INIT_RESET

/CODEC_RST

/RST_DSP

/INIT_RESET

/CODEC_RST

/RST_DSP

SOUT_78

SOUT_78

ADO1

ADO1

AUX_A

ST_A

EFF_A

SOUT_34

SOUT_56

/LRCK

BCK

SOUT_34

SOUT_56

EFF_A

FS512

FS512

/LRCK

BCK

SI_DSP

/WRQ_DSP1

SCK_DSP1

SO_DSP1

WRDY_DSP1

DRDY_DSP1

WRDY_DSP1

DRDY_DSP1

SO_DSP1

SCK_DSP1

/WRQ_DSP1

SI_DSP

SELECTOR>

SELECTOR>

SELECTOR>

SELECTOR<

SELECTOR<

/RST_DSP2

SOUT_12

ADO2

AUX_B

STOUT

EFF_B

ST_B

FS256

SOUT_12

ADO2

AUX_B

STOUT

EFF_B

ST_A

ST_B

/LRCK

BCK

FS256

EECS

EESK

EEDI

EEDO

DVB

DVDD

DVSS

IO7

IO6

IO5

IO4

IO3

IO2

IO1

IO0

/OE

A16

A15

A14

A13

A12

A11

A10

A9

A8

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

SMODE

EESEL

JX

/RQ

SCLK

SI

SO

RDY

DRDY

EEST

DVSS

DVDD

/CAS

/RAS

/WE

A0

A1

A2

A3

A4

A5

A6

A7

DVSS

DVDD

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

TESTI1

/INIT_RESET

/CODEC_RESET

/DSP_RESET

SMUTE

DVB

SDINA

SDOUTA

SDOUTD1

SDIND1

SDIND2

SDOUTD2

SDOUT1

SDOUT2

SDIN1

SDIN2

LRCK

BITCLK

CLKO

CTRL

DVDD

DVSS

OPCL

XTI

XTO

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

AINL+

AINL-

AINR+

AINR-

VRADH

AVDD

AVSS

VRADL

VCOM

ARDAH

AVDD

AVSS

VRDAL

NC

AOUTL1+

AOUTL1-

NC

AOUTR1+

AOUTR1-

NC

AOUTL2+

AOUTL2-

NC

AOUTR2+

AOUTR2-

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

80

79

78

77

76

DSP2

U909

AK7716

/INIT_RST

/CODEC_RST

/RST_DSP2

EMI

FS512

/WRQ_DSP2

SCK_DSP2

SO_DSP2

WRDY_DSP2

DRDY_DSP2

WRDY_DSP2

DRDY_DSP2

SO_DSP2

SCK_DSP2

/WRQ_DSP2

SELECTOR>

SELECTOR>

SELECTOR>

SELECTOR<

SELECTOR<

AIN4-

AIN4+

AIN3-

R939

AIN3+

R940

R941

R942

AIN4-

AIN4+

AIN3-

AIN3+

AUXSEND_AL+

AUXSEND_AL-

AUXSEND_AL+

AUXSEND_AL-

AUXSEND_AR+

AUXSEND_AR-

AUXSEND_AR+

AUXSEND_AR-

2. MAIN_D, CPU

1. MAIN_D, ROOT

3. MAIN_D, DSP_ROOT

7. MAIN_D, GA_DIF

4. MAIN_D, DSP1 2

5. MAIN_D, DSP3

6. MAIN_D, DSP SEL

8. MAIN_D, PLL

A. Character display section

B. CHANNEL fader display section [

CH

]

C. MASTER fader display section [

MASTER

]

D. Digital in status display section

[

DIGITAL 44.1kHz / 48kHz

]

E. Scene number display [

SCENE NO.

]

1. Digital in/out jack [

DIGITAL IN/OUT

]

2. RESET switch [

RESET

]

F. LED level meter display section

[

L/R, OL, -3, -6, -9, -12, -18, -24, -

∞]

G. Status indicator [

EFF/AUX: E1/E2/A1/A2,

EQ: PAN/LO/MID/HIGH

]

H. LCD level meter [

OL/1/ /6/ /12/ /24/ /48,

1/2/3/4/5/6/7/8/L/R, MAX/MIN, R/ L

]

3. POWER switch [

POWER

]

4. AC IN connector [

AC IN

]

3. SERVICE MODE

3-1. Software Version Check

While holding down both the PAN/EQ and EFF/AUX keys, press the EFF 1 key. The LCD display will show the

VM08 software version for about a second, then return to the normal display mode. The example below shows that

the software version is V1.02.

OL

1

6

12

24

48

14678LR532

MAX

R

MIN

L

MID HILOPAN

A1 A2E2E1

SCENE NO.

OL

-3

-6

-9

-12

-18

-24

-36

RL

OPTICAL

CH

MASTER

44.1kHz

1 243

< Rear Panel Section >

A

B

H

D

C

E

G

F

< Display/status/meter Section >