Fostex VC-8 Service manual
Service Manual
Model
VC-8
ADAT/ANALOG Converter
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.
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.”
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.
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;
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 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.
TABLE OF CONTENTS
1. SPECIFICATIONS.............................................................................................4
2. CONTROLS, INDICATORS AND CONNECTORS..................................... 5
3. EXPLODED VIEW ...........................................................................................6
4. PARTS LIST......................................................................................................8
5. PCB PATTERN DRAWING..........................................................................10
6. CIRCUIT DIAGRAMS ...................................................................................12
VC-8
NOTES
* Parts List and circuit diagrams are given in this manual to assist the service technician in
maintaining the Model VC-8.
* The following accessories are supplied with VC-8 as the standard accessories.
Owner's manual, VC-8, MLT : 8288444000
AC adaptor AD-12A : 8270727003 (for USA/CND)
: 8270727006 (for EUR)
: 8270727007 (for UK)
: 8270727010 (for JPN)
* Following is the packing material for the Model VC-8.
PACK, SIDE, L, DE-1 : 8228454000
PACK, SIDE, R, DE-1 : 8228455000
CARTON, INNER, VC-8 : 8228727000
CARTON, OUTER, VC-8 : 8228906000
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
VC-8
1. SPECIFICATIONS (Specification Unit : 0 dBV = 1 Vrms)
INPUT 1~8
Connector RCA pin jack
Input Impedance 20kΩ or more
Input Level -10dBV
OUTPUT 1~8
Connector RCA pin jack
Load Impedance 10kΩ or more
Output Level -10dBV
DATA IN/OUT
Connector Square shape optical
Format IEC60958 (S/P DIF)
ALESIS Proprietary Multi Channel Optical Interface
WORD IN
Connector BNC type
Input Impedance Terminate switch ON : 75Ω
Terminate switch OFF : Hi impedance
Input Level Hi Level : 3.5~5V
Lo Level : 0~1V
DIGITAL SECTION
Quantization 20-bit linear
AD Converter 20 bit 64 times over sampling ∆∑ modulation
DA Converter 20 bit 128times over sampling ∆∑ modulation
Sampling Frequency INT mode : 44.1kHz
OPTICAL/WORD mode : 32~48kHz
CHARACTERISTICS
Overall Frequency Responce +1, -2dB (20Hz~20kHz)
Dynamic Range (overall) 90dB or more
T.H.D. 0.008% or less (at 1kHz,+2dB)
Channel Separation 80dB or more (at 1kHz)
S/N (overall) 90dB or more
Phase Difference between Channel 20˚ or less
Click Noise Power ON/OFF : -20dBV or less
GENERAL
Dimensions 220 (W) x 43 (H) x 200 (D) mm
Weight 1.0kg (Excluding accessories)
Power Supply DC12V, 600mA, Exclusive AC Adaptor (AD-12A)
* Specifications and appearance are subjects to change without notice for product improvement.
* Adat and the marks are trademarks of Alesis Corporation.
4
2. CONTROLS, INDICATORS AND CONNECTORS
< Front Side >
VC-8
75Ω
OFFON
< Rear Side >
WORD
LOCKED
ANALOG INPUT MODECLOCK DIGITAL MODE
1-4 1-81-2 ONSTBYINT(44.1k)OPTICAL
1. WORD IN terminate switch
2. LOCKED LED
3. CLOCK select switch
4. ANALOG INPUT MODE switch
5. DIGITAL MODE select switch
6. POWER switch
7. POWER LED
ADAT/ANALOG CONVERTER
POWER
S/P DIFADAT
5432167
OPTICAL
8 9
AD-12A ONLY
12V
DC IN
IN
OUT
8
11
768
76
54321
ANALOG
WORD IN DIGITAL
10
8. DC IN jack [Center: Plus +]
9. ANALOG INPUT connectors 1~8 [RCA]
10. ANALOG OUTPUT connectors 1~8 [RCA]
11. WORD IN connector [BNC]
12. DIGITAL INPUT connectors [Square shape optical]
13. DIGITAL OUTPUT connectors [Square shape optical]
1312
OUTIN54321
OPTICAL
5
VC-8
3. EXPLODED VIEW
1
BBT3x8
BZn
BBT3x8
BZn
BBT3x8
BZn
2
BBT3x8
BZn
B3x6
CZn
BBT3x8
BZn
B3x6
BZn
3
BBT3x8
BZn
4
5
BBT3x8
BZn
6
Loading...