Fostex DS-8 User manual

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 OCT. 1999 8288786000
DS-8
Service Manual
Model
DIGITAL AUDIO SELECTOR

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.
11
DS-8 DS-8
INPUT 1
(COAXIAL)
INPUT 2
(COAXIAL)
INPUT 3
(OPTICAL)
INPUT 4
(OPTICAL)
INPUT 5
(OPTICAL)
INPUT 6
(OPTICAL)
INPUT 7
(OPTICAL)
INPUT 8
(OPTICAL) INPUT SELECTOR
OUT 8
INPUT SELECTOR
OUT 7
INPUT SELECTOR
OUT 6
INPUT SELECTOR
OUT 5
INPUT SELECTOR
OUT 4
INPUT SELECTOR
OUT 3
INPUT SELECTOR
OUT 2
INPUT SELECTOR
OUT 1 OUTPUT 1
(COAXIAL)
OUTPUT 2
(COAXIAL)
OUTPUT 3
(OPTICAL)
OUTPUT 4
(OPTICAL)
OUTPUT 5
(OPTICAL)
OUTPUT 6
(OPTICAL)
OUTPUT 7
(OPTICAL)
OUTPUT 8
(OPTICAL)
BLOCK DIAGRAM

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 : 8288449000 (for export model)
: 8288450000 (for domestic model)
AC adaptor AD-12A : 8270727003 (for USA/CND)
: 8270727006 (for EUR)
: 8270727007 (for UK)
: 8270727010 (for JPN)
Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining
the Model DS-8.
NOTES
The following accessories are supplied with DS-8 as the standard accessories.
*
*
Following is the packing material for the Model DS-8.
*
Carton, inner, DS-8 : 8228734000
Packing side, DS-8 : 8228436000
Packing, AC, DS-8 : 8228437000
!
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .
3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .
4. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .
4
4
5
9
!
310
DS-8 DS-8
SW PCB
2
3
4
5
6
7
8
9
S11
SRBV18 S12
SRBV18 S13
SRBV18 S14
SRBV18 S15
SRBV18 S16
SRBV18 S17
SRBV18 S18
SRBV18
OUT1
INPUT SEL OUT3
INPUT SEL OUT4
INPUT SEL OUT5
INPUT SEL OUT6
INPUT SEL OUT7
INPUT SEL OUT8
INPUT SEL
OUT2
INPUT SEL
DGND
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
IN5
IN1
IN6
IN2
IN7
IN3
IN8
IN4
OUT8
OUT1
OUT7
OUT2
OUT6
OUT3
OUT5
OUT4
J2
FPC-17P
1
10
2
3
4
5
6
7
8
9
1
10
2
3
4
5
6
7
8
9
1
10
2
3
4
5
6
7
8
9
1
10
2
3
4
5
6
7
8
9
1
10
2
3
4
5
6
7
8
9
1
10
2
3
4
5
6
7
8
9
1
10
2
3
4
5
6
7
8
9
1
10

94
DS-8 DS-8
1. SPECIFICATIONS
Specifications and appearance are subject to change without notice for product improvement.
INPUT 1, 2 (COAXIAL IN)
Connector RCA pin jack
Input Impedance 75 Ω
Normal Input Level 0.5 Vp-p
Format S/P DIF (IEC60958 part 3)
INPUT 3 - 8 (OPTICAL IN)
Connector Square shape optical
Format S/P DIF (IEC60958 part 3)
OUTPUT 1, 2 (COAXIAL OUT)
Connector RCA pin jack
Input Impedance 75 Ω
Normal Input Level 0.5 Vp-p
Format S/P DIF (IEC60958 part 3)
OUTPUT 3 - 8 (OPTICAL OUT)
Connector Square shape optical
Format S/P DIF (IEC60958 part 3)
DC IN 12 V (Inner: Plus, Outer: Minus)
SAMPLING FREQUENCY 32 kHz ~ 96 kHz
DIMENSIONS 44 (H) x 482 (W) x 113 (D) mm
WEIGHT 1.4 kg (excluding accessories)
POWER REQUIREMENT JPN : 100 V AC
USA/CND : 120 V AC
UK/EUR : 230 V AC
POWER SUPPLY Fostex AC adaptor AD-12A
2. CONTROLS, INDICATORS & CONNECTORS
1. INPUT SELECTOR [INPUT SELECTOR 1 - 8]
2. Input connector 8 [S/P DIF INPUT 8]
3. Output connector 8 [S/P DIF OUTPUT 8]
4. Power switch / POWER LED [POWER]
5. Input connector 1, 2 [S/P DIF INPUT 1, 2]
6. Input connector 3 - 7 [S/P DIF INPUT 3 - 7]
7. Output connector 1, 2 [S/P DIF OUTPUT 1, 2]
8. Output connector 3 - 7 [S/P DIF OUTPUT 3 - 7]
9. DC IN connector [DC IN 12V]
S/P DIF DIGITAL AUDIO SELECTOR
8
S/P DIF OUTPUT
S/P DIF INPUT
INPUT SELECTOR
INPUT 8
OUTPUT 8
4
3
2
1
5
6
7
8
INPUT 7
4
3
2
1
5
6
7
8
INPUT 6
4
3
2
1
5
6
7
8
INPUT 5
4
3
2
1
5
6
7
8
INPUT 4
4
3
2
1
5
6
7
8
INPUT 3
4
3
2
1
5
6
7
8
INPUT 2
4
3
2
1
5
6
7
8
INPUT 1
4
3
2
1
5
6
7
8
POWER
OUTPUT 7OUTPUT 6OUTPUT 5OUTPUT 4OUTPUT 3OUTPUT 2OUTPUT 1
8
1234
< FRONT PANEL >
1234567
S/P DIF INPUTS/P DIF OUTPUT
12V
DC IN
1234567
56
7
8
9
< REAR PANEL >
4. CIRCUIT & BLOCK DIAGRAMS
MAIN / REGULATOR PCB
1
3
2
U11
GPIF37R1
INPUT3
(OPTICAL)
D+5
DGND
D+5
R15
3.3K
C13
0.1
DGND
R17
jumper
R16
2.2K
U2A
74HC04
1
3
2
U21
GPIF37R1
INPUT4
(OPTICAL)
D+5
DGND
D+5
R25
3.3K
C23
0.1
DGND
R27
jumper
R26
2.2K
U2B
74HC04
1
3
2
U31
GPIF37R1
INPUT5
(OPTICAL)
D+5
DGND
D+5
R35
3.3K
C33
0.1
DGND
R37
jumper
R36
2.2K
U2C
74HC04
1
3
2
U41
GPIF37R1
INPUT6
(OPTICAL)
D+5
DGND
D+5
R45
3.3K
C43
0.1
DGND
R47
jumper
R46
2.2K
U2D
74HC04
1
3
2
U51
GPIF37R1
INPUT7
(OPTICAL)
D+5
DGND
D+5
R55
3.3K
C53
0.1
DGND
R57
jumper
R56
2.2K
U2E
74HC04
1
3
2
U61
GPIF37R1
INPUT8
(OPTICAL)
D+5
DGND
D+5
R65
3.3K
C63
0.1
DGND
R67
jumper
R66
2.2K
U2F
74HC04
DGND
DGND
R11
75
L11
jumper
C15
33/25 R12
10
D+5
D11
DIODE
D12
DIODE
DGND
U1A
74HCU04
12
R13 47K
C11 22P
C12
47P
DGND
R14
2.2K
DGND
R21
75
L21
jumper
C25
33/25 R22
10
D+5
D21
DIODE
D22
DIODE
DGND
U1F
74HCU04
13 12
R23 47K
C21 22P
C22
47P
DGND
R24
2.2K
J11
YKC21-3079
INPUT1
(COAXIAL)
INPUT2
(COAXIAL)
U3A
74HC04 1
3
2
C15
0.1
D+5
DGND
U12
GPIF38T2
OUTPUT3
(OPTICAL)
1
3
2
C25
0.1
D+5
DGND
U22
GPIF38T2
OUTPUT4
(OPTICAL)
1
3
2
C35
0.1
D+5
DGND
U32
GPIF38T2
OUTPUT5
(OPTICAL)
1
3
2
C45
0.1
D+5
DGND
U42
GPIF38T2
OUTPUT6
(OPTICAL)
1
3
2
C55
0.1
D+5
DGND
U52
GPIF38T2
OUTPUT7
(OPTICAL)
1
3
2
C65
0.1
D+5
DGND
U62
GPIF38T2
OUTPUT8
(OPTICAL)
C1
10/35
S1
L2
jumper W4
L1
jumper W3
D1
DIODE D+5
DGND
J4
2
(NON)
1
C92
0.1
C91
0.1
3
2
1
1
2
G
3IN OUT
W1
B. IN-3P
U91 78M05
PCB, REGULATOR
34
11 10
U1B
74HCU04
U1E
74HCU04
U4B
L12
jumper
34
6
1
2
TRANSFORMER
T11
DGND
R18
75
L13
BEAD
L14 BEAD
DGND
J12
YKC21-3079
OUTPUT1
(COAXIAL)
OUTPUT2
(COAXIAL)
56
98
U1C
74HCU04
U1D
74HCU04
U4C
L22
jumper
34
6
1
2
TRANSFORMER
T21
DGND
R28
75
L23
BEAD
L24 BEAD
C14
0.1 C24
0.1
DGND
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
IN5
IN1
IN6
IN2
IN7
IN3
IN8
IN4
OUT8
OUT1
OUT7
OUT2
OUT6
OUT3
OUT5
OUT4
DGND J2
FPC-17P
U4F
U4D
U4E
D+5
U4A
DGND
R1
470
D2
LED
C17
33/25
C27
33/25
J1
YKB31-0012
J5
8283-3P
2
3
1
C2
100/10 C3
10/16 C4
10/16 C5
10/16 C6
0.1 C7
0.1 C8
0.1 C9
D+5
DGND
DGND
3
2
1
12
U3B
74HC04
34
U3C
74HC04
56
U3D
74HC04
98
U3E
74HC04
11 10
U3F
74HC04
13 12
12
34
56
98
11 10
13 12
1
2
3
4
5
1
2
3
4
5
89
1011
1213
21

8
DS-8 DS-8
3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST
Ref. No. Part No. Description
1 8221 2230 00 Cover, DS-8/DP-8
2 8221 3090 00 Panel, dress, DS-8
3 8221 3100 00 Panel, rear, DS-8
4 8274 2450 00 PCB assy, SW, DS-8
5 8274 2440 00 PCB assy, Regulator, DS-8
6 8274 2430 00 PCB assy, MAIN, DS-8
7 8226 0130 02 Button, push, B, N08
8 8221 2220 00 Chassis, DS-8/DP-8
9 8226 1870 02 Knob, VR, W, N19
Ref. No. Part No. Description
10 8270 7270 03 AC adaptor, AD-12A, 120V, USA/CND
8270 7270 06 AC adaptor, AD-12A, 230V, EUR
8270 7270 07 AC adaptor, AD-12A, 240V, UK
8270 7270 10 AC adaptor, AD-12A, 100V, JPN
11 8226 0191 00 Escutcheon, B
12 8216 6570 00 Spacer, escutcheon
13 8276 8396 05 Cable, flat, FFC, 17P, L50
(Included in MAIN PCB assy.)
14 8216 6920 00 Sheet, volume, DS-8/DP-8
DS-8 OVERALL EXPLODED VIEW & PARTS LIST
BBT 3x8
BZn
BBT 3x8 BZn
BBT 3x8 BZn
BBT 3x6 BZn
BBT 3x6 BZn
P 3x5 CZn
P 3x5 CZn
BBT 3x6
BZn
1
2
3
4
5
6
78
9
10
Attached to each pot.
BBT 3x6 BZn
11
12
13
14
Ref. No. Part No. Description
8274 2440 00 PCB Assy, Regulator, DS-8
8251 9660 02 Plain PCB, Regulator, DS-8
Ref. No. Part No. Description
U091 8236 0320 01 IC, 220, AN, regulator, NJM78M05FA
C091, 092 8232 8181 04 Capacitor, VT, CER, 25V, 0.1µF,
+80-20%, YF
W001 8276 7730 10 Cable assy, 3P, WHTMT/F-MT/BS, L100
E101, 102 N/A
• REGULATOR PCB assy
• SW PCB assys
Ref. No. Part No. Description
8274 2450 00 PCB Assy, SW, DS-8
8251 9660 03 Plain PCB, SW, DS-8
Ref. No. Part No. Description
S011~081 8253 4600 01 SW, P, rotary, 1-8, non-shortening, SRBV18
J003 8245 2721 17 Connector, PL, jack, FPC, 17P
W002 N/A
E101, 102 N/A
DIP: Dual In Line
H: Horizontal mount
V: Vertical mount
T: Taping device
PI: Penetrate mount I form (straight)
PL: Penetrate mount L form (right angle)
DG: Digital
Abbreviation
Ref. No. Part No. Description
8274 2430 00 PCB Assy, Main, DS-8
8251 9661 01 Plain PCB, Main, DS-8
ICs
Ref. No. Part No. Description
U001 8236 0074 01 DIP, DG, CMOS, 74HCU04
U002, 003 8236 0812 00 DIP, DG, CMOS, 74HC04
U004 N/A
U011~061 8245 5530 10 Connector, opt, GPIF37R1
U012~062 8245 5520 10 Connector, opt, GPIF38T2
DIODEs
Ref. No. Part No. Description
D001 8234 0196 02 HT, DSK10C-BT
D002 8234 0201 00 Opt, V, LED, green, GLK3KG8
D011, 021 8234 5007 00 HT, 1SS136
D012, 022 8234 5007 00 HT, 1SS136
RESISTORs
Ref. No. Part No. Description
R001 8230 1384 71 HT, Carbon, 1/4W, 470Ω, 5%
R011, 021 8230 1387 50 HT, Carbon, 1/4W, 75Ω, 5%
R012, 022 8230 1381 00 HT, Carbon, 1/4W, 10Ω, 5%
R013, 023 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5%
R014, 024 8230 1382 22 HT, Carbon, 1/4W, 2.2kΩ, 5%
R015~065 8230 1383 32 HT, Carbon, 1/4W, 3.3kΩ, 5%
R016~066 8230 1382 22 HT, Carbon, 1/4W, 2.2kΩ, 5%
R017~067 Jumper, F5
R018, 028 8230 1387 50 HT, Carbon, 1/4W, 75Ω, 5%
CAPACITORs
ALU = Electrolytic type
CER = Ceramic type
Ref. No. Part No. Description
C001 8232 1451 06 VT, ALU, 35V, 10µF, 20%, SME-VB
C002 8232 1421 07 VT, ALU, 10V, 100µF, 20 %, SME-VB
C003~005 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C006, 007 8232 8181 04 VT, CER, 25V, 0.1µF, +80-20%, YF
C008, 009 N/A
C011, 021 8232 8012 20 VT, CER, 50V, 22pF, 5%, SL
C012, 022 8232 8014 70 VT, CER, 50V, 47pF, 5%, SL
C013~063 8232 8181 04 VT, CER, 25V, 0.1µF, +80-20%, YF
C014, 024 8232 8181 04 VT, CER, 25V, 0.1µF, +80-20%, YF
C015~065 8232 8181 04 VT, CER, 25V, 0.1µF, +80-20%, YF
C016, 026 8232 1443 36 VT, ALU, 25V, 33µF, 20 %, SME-VB
C017, 027 8232 1443 36 VT, ALU, 25V, 33µF, 20 %, SME-VB
MISCELLANEOUS
Ref. No. Part No. Description
Y201 8276 8730 02 Tube, UL, black, 1, L05
E201 Jumper, F5
E202 Jumper, F10
J001 8245 5410 00 Connector, jack, DC inlet, YKB31-0012
Ref. No. Part No. Description
J002 8245 2720 17 Connector, PI, jack, FPC, 17P
J004 N/A
J005 8245 1711 03 Connector, PI, jack, 8283, 3P, WHT
J011, 012 8245 3130 01 Connector, PL, jack, RCA, 2P, BLK, WS
L001, 002 N/A
L011, 021 N/A
L012, 022 N/A
L013, 023 8242 1860 13 Filter, T, EMI, LFW7B-M3R2T
L014, 024 8242 1860 13 Filter, T, EMI, LFW7B-M3R2T
S001 8253 4610 01 Switch, P, push, power, SDDL
T011, 021 8242 2350 00 Transformer, digital out, K7-T
W003, 004 Jumper, F5
W401 8276 8396 05 Cable, flat, FFC, 17P, L50
• MAIN PCB assy
DS-8 Parts List
5

76
• Foil Side of MAIN / REGULATOR / SW PCB assys
DS-8 PCB ASSEMBLIES
• Parts Side of MAIN / REGULATOR / SW PCB assys
C16
R22
C26
R12
C7
C5 12 D11
J4
R21
D21
1
R11
8
U2
R15
R16
8
D12
D22
J11
L21R17
L11
IN2
IN1
C13
R25
R26
C23
R27 IN3
U11
IN4
U21
IN5
U31
IN6
U41
IN7
U51
R35
R36
C33
R37
R45
R46
C43
R47
C22
R23
C21
R24
C12
R13
C11
R14
1
8
17 1
J2
R55
R56
C53
R57
C6
C14
C17
C27
C3
L13
R18
L22
L14
C24
R28
L24
C4
L23
T21
T11
J12
L12
U1
OUT3
U12
C4
OUT4
U22
OUT5
U32
OUT6
U42
C15 C25 C35
OUT7
U52
C55
C45 J1 DC IN
L2
L1
W4
W3
1
8
U4
1
8
U3
C9
C8
C1
R1
C2
D1
POWER SW
S1
D2
OUT8
U62
IN8
U61
C65
8251966 001
MAIN,DP-8
R66
R65
R67
C69 13 J5
C92
C91
1
1
3U91
3W1
8251966 002
REGULATOR,DP-8
8251966 003
SW,DP-8
17 1
5
6
10
1
S11
5
6
10
1
S21
5
6
10
1
S31
5
6
10
1
S41
5
6
10
1
S51
5
6
10
1
S61
5
6
10
1
S71
5
6
10
1
S81
J3
W2
OUT1
U52 OUT7
123
U42 OUT6
123
U32 OUT5
123
U22 OUT4
123
U12 OUT3
123
S
L1
B
P
C55
W4
W3
L2
J1
U3
8
1
C45 C35 C25 C15
U4
8
1
C8
C9
D1
C1
S1
POWER SW
R1
D2
U62 OUT8
312
U61 IN8
312
C65
R67
R65
R66
C63
C2
J5
13
C27
C17
L22
L24
L23
R18
L13
L14
L12
R28
C24
1
2
OUT1 J12
4
3
OUT2
T21 T11
C3
C53
R56
R55
R57
C14
U51 IN7
123
U41 IN6
123
U31 IN5
123
C43
R46
R45
R47
C33
R36
R35
R37
C23
R26
R25
R27
C13
R16
R15
R17
U21 IN4
123
U11 IN3
123
U1
8
1
R23
C21
C22
R24
R13
C11
C12
R14
117
8
1
C6
U2
8
1
1
8
J4
12
D11
L21
L11
R2
D2
R11
C16
R12
D12
R22
C5
C7
C26
1
2
IN1 J11
4
3
IN2
J2
C4
W1
13
C92 C91
13
U91
17 1
J3
W2
5
610
1
S81
5
610
1
S71
5
610
1
S61
5
610
1
S51
5
610
1
S41
5
610
1
S31
5
610
1
S21
5
610
1
S11
D22
DS-8 DS-8
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