Fostex VM-04 Service manual

Service Manual

Model

VM04

4ch 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 1999 8288778000

VM04VM04

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.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

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.

“WARNING”

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

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.

8. BLOCK DIAGRAMS

OUTPUT

(-10dBV)

R

D/A

PHONES

PHONES

METER

MASTER FADER

L

S/P DIF OUT

D/A

MASTER

EFFECT

EFFECT

SAFETY INSTRUCTIONS

1. Read instructions - All the safety and operating instructions
should be read before the appliance is operated.

2. Retain instructions - The safety and operating instructions
should be retained for future reference.

3. Heed warnings - All warnings on the appliance and in the
operating instructions should be adhered to.

4. Follow instructions - All operating and use instructions
should be followed.

5. 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.

6. Carts and Stands - The appliance should be used only with a
cart or stand that is recommended by the manufacturer.

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 overturn.

7. Wall or Ceiling Mounting - The appliance should be mounted
to a wall or ceiling only as recommended by the manufac­turer.

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

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;

or

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

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

exhibits a marked changed in performance; or
E. The appliance has been dropped, or the enclosure dam-

aged.

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.

EFFECT

R
L

METER

CH1

PAN

FADER

10kHz100Hz

A/D

INPUT 1

(-10dBV~-50dBV)

HI

LO

TRIM

EFFECT

SEND

PRE/POST

10kHz100Hz

METER

CH2

PAN

FADER

A/D

INPUT 2

(-10dBV~-50dBV)

TRIM

10kHz100Hz

METER

CH4

PAN

FADER

A/D

INPUT 4

(-10dBV)

EFFECT

SEND

PRE/POST

LO HI

METER

10kHz100Hz

PAN

FADER

EFFECT

SEND

PRE/POST

LO HI

EFFECT

SEND

PRE/POST

HI

LO

A/D

CH3

INPUT 3

(-10dBV)

23

VM04VM04

TABLE OF CONTENTS

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

R405

10KB

2

3

AD+5

R404

10KB

3

AD+5

R403

10KB

3

AD+5

1

ADGND

2

1

ADGND

2

1

ADGND

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

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

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

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

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

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

7. CIRCUIT DIAGRAMS .................................................................. 16

8. BLOCK DIAGRAMS..................................................................... 23

R402

10KB

2

3

AD+5

1

ADGND

NOTES

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

Model VM04

R401

10KB

2

3

AD+5

1

ADGND

U401

EC12E

C

3

B
A

DGND

2
1

* The following accessories are supplied with VM04 as the standard accessories.

Owner's manual : 8288440000
AC adaptor AD-9B : 8270818003 (for USA/CND)

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

* Following is the packing material for the Model VM04.

PACK, SIDE, L, VM04 : 8228446000

AD+5

PACK, SIDE, R, VM04 : 8228447000

AD+5

AD+5

AD+5

AD+5

VR0

VR1

VR2

VR3

<<<<<

1234567891011121314151617

ADGND

ADGND

ADGND

VR4

DGND

ADGND

JOG0

JOG1

<

<

DGND ADGND

DGND

CARTON, INNER, VM04 : 8228722000
CARTON, OUTER, VM04 : 8228901000

FADER PCB

J401

FPC-17P

To Main J11

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.

322

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)

Effect Send.................................................................................................................................................. 00 position

MIXER SECTION

INPUT 1, 2

Input Level .......................................................................................................................................-50dBV ~ -10dBV

Input Impedance ..................................................................................................................................... 20kΩ or more

Connector................................................................................................................... Ø6 mm Phone Jack/Unbalanced

INPUT 3, 4

Input Level ........................................................................................................................................................-10dBV

Input Impedance ..................................................................................................................................... 20kΩ or more

Connector................................................................................................................... Ø6 mm Phone Jack/Unbalanced

OUTPUT (L, R)

Output Level .....................................................................................................................................................-10dBV

Load Impedance...................................................................................................................................... 10kΩ or more

Connector................................................................................................................... Ø6 mm Phone Jack/Unbalanced

PHONES OUT

Output Level .........................................................................................................................20 mW MAX (16Ω load)

Load Impedance........................................................................................................................................ 16Ω or more

Connector............................................................................................................................ Ø6 mm Stereo Phone Jack

EQUALIZER

HI (Shelving Type) ...............................................................................................±18dB or more (-10dBV / 10 kHz)

LO (Shelving Type) ..............................................................................................±18dB or more (-10dBV / 100 Hz)

FREQUENCY RESPONSE

Input (-10dBV) → Stereo Out (-10dBV)............................................................................. +1, -2dB (20Hz ~ 20kHz)

Input (-50dBV) → Stereo Out (-10dBV)............................................................................. +1, -3dB (20Hz ~ 20kHz)

Input (-10dBV) → Phones Out (20mW/16Ω) ..................................................................... +1, -3dB (20Hz ~ 20kHz)

S/N (with DAT envelope filter)

Input (+2dBV) → Stereo Out (+2dBV)....................................................................................86dB or more (IHF-A)

Input (-38dBV) → Stereo Out (+2dBV)...................................................................................66dB or more (IHF-A)

Input ∑4 (+2dBV) → Stereo Out (+2dBV) .............................................................................. 81dB or more (IHF-A)

Phones Out Phones Out Residual Noise ................................................................................... 66dB or more (IHF-A)

DISTORTION (with DAT envelope filter)

Input (+2dBV) → Stereo Out (0dBV) ..........................................................................0.1% or less (100Hz ~ 10kHz)

Input (-40dBV) → Stereo Out (0dBV) .........................................................................0.1% or less (100Hz ~ 10kHz)

Input (0dBV) → Phones Out (20mW/16Ω) ................................................................................. 1.0% or less (1kHz)

CROSSTALK ................................................................................................................................... 60dB or more (1kHz)

SHOCK NOISE ..................................................................................................................................... -30dBVp-p or less

LEVEL INDICATION

Type ............................................................................................................................................ LCD Bargraph Meter

Number of Indicated Levels ...................................................... 11 dots (-48, -30, -24, -18, -12, -9, -6, -3, -1, 0, OL)

Reference Level (-10dBV) Indication ................................................................................................................ -12dB

DIGITAL SECTION

SAMPLING FREQUENCY ..................................................................................................................................44.1kHz

QUANTIZATION ........................................................................................................................................... 16 bit linear

A/D CONVERTER ......................................................20bit, 64 times Over Sampling Enhanced Dual Bit, Delta-Sigma

D/A CONVERTER .................................................................................... 20bit 128-time, Over Sampling, Delta-Sigma

S/P DIF OUT

Format ......................................................................................................................................... IEC 60958 (S/P DIF)

Connector...........................................................................................................................................................Optical

GENERAL

DC IN AD-9B, DC9V, 650 mA (the Center Positive)

DIMENSIONS................................................................................................................ 254 (W) × 186 (D) × 50 (H) mm

WEIGHT .................................................................................................................................................... Approx. 1.1 kg

POWER SUPPLY

USA/CND ............................................................................................................................................ 120VAC, 60Hz

EUR/UK.......................................................................................................................................... 230VAC, 50/60Hz

JPN 100VAC, 50/60Hz

VM04VM04

D303B

DIODE

S306

R326

NON

KEY0

R325

NON

D+5D+5

L302

LAMP

SEG4 0
SEG3 9
SEG3 8
SEG3 7
SEG3 6
SEG3 5
SEG3 4
SEG3 3
SEG3 2
SEG3 1
SEG3 0
SEG2 9
SEG2 8
SEG2 7
SEG2 6
SEG2 5
SEG2 4
SEG2 3
SEG2 2
SEG2 1
SEG2 0
SEG1 9
SEG1 8
SEG1 7
SEG1 6
SEG1 5
SEG1 4
SEG1 3
SEG1 2
SEG1 1
SEG1 0
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1

SEG[ 1. .40]

SEG3 8
SEG3 7
SEG3 6
SEG3 5
SEG3 4
SEG3 3
SEG3 2
SEG3 1
SEG3 0
SEG2 9
SEG2 8
SEG2 7
SEG2 6
SEG2 5
SEG2 4
SEG2 3

SEG4 0

40

SEG3 9

39

SEG3 8

38

SEG3 7

37

SEG3 6

36

SEG3 5

35

SEG3 4

34

SEG3 3

33

SEG3 2

32

SEG3 1

31

SEG3 0

30

SEG2 9

29

SEG2 8

28

SEG2 7

27

SEG2 6

26

SEG2 5

25

SEG2 4

24

SEG2 3

23

SEG2 2

22

SEG2 1

21

SEG2 0

20

SEG1 9

19

SEG1 8

18

SEG1 7

17

SEG1 6

16

SEG1 5

15

SEG1 4

14

SEG1 3

13

SEG1 2

12

SEG1 1

11

SEG1 0

10

SEG9

9

SEG8

8

SEG7

7

SEG6

6

SEG5

5

SEG4

4

SEG3

3

SEG2

2

SEG1

1

L301

SEG39

64

SEG3 8

65

SEG3 7

66

SEG3 6

67

SEG3 5

68

SEG3 4

69

SEG3 3

70

SEG3 2

71

SEG3 1

72

SEG3 0

73

SEG2 9

74

SEG2 8

75

SEG2 7

76

SEG2 6

77

SEG2 5

78

SEG2 4

79

SEG2 3

80

SEG22

COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM13
COM12
COM11
COM10
COM9
SEG3 3
SEG2 8
SEG2 3
SEG1 8
SEG1 3
SEG4 0
SEG3 9
SEG3 8
SEG3 7
SEG1 6

U302

SEG1 0

LCD_FD4

SEG9
SEG8
SEG7
SEG6
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
SEG1
SEG2
SEG3
SEG4
SEG5

LAMP

DGND DGND

SEG40

COM11

COM12

COM13

COM14

COM15

COM16

62

SEG4063SEG39

SEG221SEG212SEG203SEG194SEG185SEG176SEG167SEG158SEG149SEG1310SEG1211SEG1112SEG1013SEG914SEG815SEG716SEG617SEG518SEG419SEG320SEG221SEG122GND23OSCI

SEG15

SEG16

SEG17

SEG18

SEG19

SEG20

SEG21

COM1

80

COM2

79

COM3

78

COM4

77

COM5

76

COM6

75

COM7

74

COM13

73

COM12

72

COM11

71

COM10

70

COM9

69

SEG3 3

68

SEG2 8

67

SEG2 3

66

SEG1 8

65

SEG1 3

64

SEG4 0

63

SEG3 9

62

SEG3 8

61

SEG3 7

60

SEG1 6

59

SEG1 0

58

SEG9

57

SEG8

56

SEG7

55

SEG6

54

COM16

53

COM15

52

COM14

51

COM13

50

COM12

49

COM11

48

COM10

47

COM9

46

SEG1

45

SEG2

44

SEG3

43

SEG4

42

SEG5

41

COM[1..16 ]

LCD_D3

LCD_D4

LCD_D5

LCD_D6

LCD_D7

COM1

COM2

COM3

COM4

COM5

COM6

COM7

COM8

COM9

COM10

55

COM1056COM1157COM1258COM1359COM1460COM1561COM16

U301

SEG11

SEG12

SEG13

SEG14

46

COM147COM248COM349COM450COM551COM652COM753COM854COM9

HD44780U

SEG1

SEG2

SEG3

SEG4

SEG5

SEG6

SEG7

SEG8

SEG9

SEG10

LCD_D2

24

KEY1

R324

NON

KEY2

R323

NON

KEY3

R322

NON

KEY4

D+5 D+5 D+5 D+5 D+5 D+5

R321

NON

KEY5

KEY[0..5]

C302

DB241DB342DB443DB544DB645DB7

R301

DGND

0.01

D+5

DB1
DB0
E
R/W
RS
D
M
VCC
CL2
CL1
V5
V4
V3
V2
V1
OSCO

220K

D+5

DGND

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25

R3021KR3031KR3041KR3051KR306

TACT

D303A

DIODE

S305

TACT

D302B

DIODE

S304

TACT

D302A

DIODE

S303

TACT

D301B

DIODE

S302

TACT

D301A

DIODE

FADER ADJ CH1 C H2 CH3 CH4 VIEW

S301

TACT

DIG0

LCD_D1
LCD_D0
E
R/W
RS

1K

D306B

DIODE

S312

TACT

D305B

DIODE

S311

TACT

D304B

DIODE

S310

TACT

D306A

DIODE

S309

TACT

D305A

DIODE

S308

TACT

D304A

DIODE

RECAL L EFF TYPE EXI T STORE EFF PARAM E NTE R

S307

TACT

DIG1

DGND

DGND

KEY0

KEY1

KEY2

KEY3

KEY4

KEY5

DIG0

DIG1

LED_A0

1234567891011121314151617

J302

C301

0.1

DGND

D+5

DGND

LCD_D2

LCD_D3

LCD_D4

LCD_D5

LCD_D6

LCD_D7>

>>>>>>>>>

1234567891011121314151617

J301

5KB

R311

2

R307

3

10K

1

D-12

D356

NON

D355

LED

D354

LED

D353

LED

D352

LED

D351

LED

FADER ADJ CH1 CH2 CH3 CH4

LED_A0

LED_A1

LED_K0

LED_K1

LED_K2

LED_K3

LED_K4

LED_K5

FPC-1 7P

DGND

DGND

D+5

D+5

E

R/WRSLCD_D0

LCD_D1

>

D362

NON

LED_K0

D361

LED

LED_K1

D360

LED

LED_K2

D359

NON

LED_K3

D358

LED

LED_K4

D357

LED

RECAL L EFF TYPE STORE EFF PARAM

LED_K5

LED_A1

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

LED_K[0..5]

To Mai n J1 3

D-12DGND

D-12

FPC-1 7P

To Main J12

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

DISPLAY PCB

214