Page 1
Service Manual
Model
DS-8
DIGITAL AUDIO SELECTOR
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
Page 2
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)
CAUTION:
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
Wall or Ceiling Mounting - The appliance should be
7.
mounted to a wall or ceiling only as recommended by the
manufacturer.
Ventilation - The appliance should be situated so that its
8.
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.
Heat - The appliance should be situated away from heat
9.
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to a
10.
power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - The precautions that should
11.
be taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should be
12.
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.
Cleaning - The appliance should be cleaned only as rec-
13.
ommended by the manufacturer.
Nonuse Periods - The power cord of the appliance should
14.
be unplugged from the outlet when left unused for a long
period of time.
Object and Liquid Entry - Care should be taken so that
15.
objects do not fall and liquids are not spilled into the enclosure through openings.
Damage requiring Service - The appliance should be ser-
16.
viced by qualified service personnel when:
A.
B.
C.
D.
E.
Servicing - The user should not attempt to service the ap-
17.
pliance beyond that described in the operating instructions. All other servicing should be referred to qualified
service personnel.
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.
BLOCK DIAGRAM
11
Page 3
!
DS-8 DS-8
S18
SRBV18
9
8
7
6
5
4
3
2
10
1
OUT8
INPUT SEL
S17
SRBV18
9
8
7
6
5
4
3
2
10
1
OUT7
INPUT SEL
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .
3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .
S16
SRBV18
9
8
7
6
5
4
3
2
9
8
7
6
5
4
3
2
9
8
7
6
5
4
3
2
S15
S14
SRBV18
SRBV18
10
1
10
1
10
1
OUT6
INPUT SEL
OUT5
INPUT SEL
OUT4
INPUT SEL
4. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS
4
4
5
9
NOTES
S13
SRBV18
9
8
7
6
5
4
3
2
10
1
OUT3
INPUT SEL
Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining
*
the Model DS-8.
The following accessories are supplied with DS-8 as the standard accessories.
*
S12
SRBV18
9
8
7
6
5
4
3
2
9
8
7
6
5
4
3
2
S11
SRBV18
10
1
10
1
OUT2
INPUT SEL
OUT1
INPUT SEL
AC adaptor AD-12A : 8270727003 (for USA/CND)
Following is the packing material for the Model DS-8.
*
Carton, inner, DS-8 : 8228734000
: 8288450000 (for domestic model)
: 8270727006 (for EUR)
: 8270727007 (for UK)
: 8270727010 (for JPN)
Packing side, DS-8 : 8228436000
Packing, AC, DS-8 : 8228437000
CAUTION
DGND
IN5
IN1
IN6
IN2
IN7
IN3
IN8
IN4
OUT8
OUT1
OUT7
OUT2
OUT6
OUT3
OUT5
Owner's manual : 8288449000 (for export model)
OUT4
FPC-17P
SW PCB
1716151413121110987654321
J2
!
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.
310
Page 4
DS-8 DS-8
1. SPECIFICATIONS
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
Specifications and appearance are subject to change without notice for product improvement.
2. CONTROLS, INDICATORS & CONNECTORS
<
FRONT PANEL
4
4
5
3
6
2
7
8
1
INPUT 1
<
REAR PANEL
5
6
3
2
7
8
1
INPUT 2
9
12V
DC IN
1. INPUT SELECTOR [
2. Input connector 8 [
3. Output connector 8 [
4. Power switch / POWER LED [
>
4
5
4
6
3
2
1
INPUT 3
3
2
7
8
1
INPUT SELECTOR
INPUT 4
>
8
INPUT SELECTOR 1 - 8
S/P DIF INPUT 8
S/P DIF OUTPUT 8
1
5
4
3
6
2
7
1
8
4
5
6
3
2
7
8
1
INPUT 5
7
POWER
INPUT 6
1234567
INPUT 7
OUTPUT 8
4
5
6
7
8
5
6
3
2
7
S/P DIF DIGITAL AUDIO SELECTOR
8
1
INPUT 8
OUTPUT 7OUTPUT 6OUTPUT 5OUTPUT 4OUTPUT 3OUTPUT 2OUTPUT 1
5
4
3
6
7
2
8
1
56
1234567
S/P DIF INPUTS/P DIF OUTPUT
5. Input connector 1, 2 [
]
]
]
]
6. Input connector 3 - 7 [
7. Output connector 1, 2 [
8. Output connector 3 - 7 [
9. DC IN connector [
DC IN 12V
234
S/P DIF INPUT
S/P DIF OUTPUT
8
S/P DIF INPUT 1, 2
S/P DIF INPUT 3 - 7
S/P DIF OUTPUT 1, 2
S/P DIF OUTPUT 3 - 7
]
8
POWER
]
]
]
]
4. CIRCUIT & BLOCK DIAGRAMS
C92
0.1
1
OUT
78M05
2
G
IN
U91
3
PCB, REGULATOR
0.1
C91
U12
GPIF38T2
OUTPUT3
(OPTICAL)
132
D+5
0.1
C15
2
U3A
74HC04
1
U4C
2
U2A
74HC04
1
R17
jumper
R15
3.3K
0.1
3
1
U11
GPIF37R1
R16
2.2K
2
INPUT3
(OPTICAL)
DGND
DGND
D+5
DGND
D+5
D+5
C25
0.1
C23
J12
C11 22P
D+5
J11
D+5
YKC21-3079
L13
BEAD
75
R18
T11
L12
jumper
C17
33/25
U1B
74HCU04
R13 47K
D11
DIODE
10
R12
C15
33/25
L11
jumper
YKC21-3079
89
1011
U4E
U4D
OUTPUT2
(COAXIAL)
OUTPUT1
(COAXIAL)
1
2
3
4
L14 BEAD
6
TRANSFORMER
34
1
2
4
10
U1E
74HCU04
3
11
R14
2.2K
DGND
C12
47P
2
U1A
(COAXIAL)
D12
R11
2
74HCU04
DIODE
75
DGND
DGND
3
INPUT2
(COAXIAL)
C21 22P
4
1
1
INPUT1
DGND
D+5
21
1213
U4F
U4A
DGND
5
DGND
C24
0.1
DGND
0.1
C14
L23
BEAD
L24 BEAD
75
R28
6
T21
1
L22
jumper
C27
33/25
6
U4B
U1C
74HCU04
5
12
R23 47K
13
D21
DIODE
10
R22
C25
33/25
L21
jumper
DGND
5
TRANSFORMER
34
2
DGND
8
U1D
74HCU04
9
R24
2.2K
DGND
C22
47P
U1F
74HCU04
DGND
D22
DIODE
D+5
R21
75
DGND
C13
D+5
MAIN / REGULATOR PCB
0.1
U3B
U2B
R27
R25
1
U21
1
2
3
W1
U22
GPIF38T2
132
4
74HC04
3
4
74HC04
3
jumper
3.3K
3
GPIF37R1
B. IN-3P
OUTPUT4
(OPTICAL)
R26
2.2K
2
INPUT4
(OPTICAL)
DGND
DGND
DGND
D+5
D+5
J5
C33
8283-3P
D+5
C35
0.1
1
2
3
DGND
0.1
U3C
U2C
1
D2
U32
GPIF38T2
74HC04
74HC04
R37
jumper
R35
3.3K
U31
GPIF37R1
LED
132
6
5
6
5
3
J4
D+5
R1
470
D1
L2
J1
OUTPUT5
(OPTICAL)
R36
2
INPUT5
2
DIODE
S1
jumper W4
231
YKB31-0012
2.2K
(OPTICAL)
1
L1
jumper W3
DGND
DGND
D+5
DGND
D+5
(NON)
DGND
C1
10/35
U42
GPIF38T2
OUTPUT6
(OPTICAL)
132
D+5
0.1
C45
8
U3D
74HC04
9
8
U2D
74HC04
9
R47
jumper
R46
2.2K
R45
3.3K
0.1
C43
3
2
1
U41
INPUT6
(OPTICAL)
GPIF37R1
DGND
DGND
D+5
DGND
D+5
C9
C8
0.1
C7
0.1
C6
0.1
C5
10/16
C4
10/16
C3
10/16
C2
100/10
D+5
U52
GPIF38T2
OUTPUT7
(OPTICAL)
132
D+5
0.1
C55
10
U3E
74HC04
11
10
U2E
74HC04
11
R57
jumper
R56
2.2K
R55
3.3K
0.1
C53
3
2
1
U51
INPUT7
(OPTICAL)
GPIF37R1
DGND
DGND
D+5
DGND
D+5
DGND
U62
GPIF38T2
OUTPUT8
(OPTICAL)
132
D+5
0.1
C65
U3F
74HC04
U2F
74HC04
R67
jumper
R65
3.3K
0.1
C63
1
U61
GPIF37R1
DGND
12
13
OUT4
1
OUT5
2
OUT3
3
OUT6
4
OUT2
5
OUT7
6
OUT1
7
OUT8
8
IN4
9
IN8
10
IN3
11
IN7
12
IN2
13
IN6
14
IN1
15
IN5
16
17
R66
2.2K
2
(OPTICAL)
J2
FPC-17P
DGND
DGND
DGND
12
13
3
INPUT8
94
Page 5
DS-8 DS-8
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
7
8
9
10
Attached to each pot.
BBT 3x6 BZn
11
12
13
14
8
DS-8 Parts List
• MAIN PCB assy
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%
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
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
CAPACITORs
ALU = Electrolytic type
CER = Ceramic type
MISCELLANEOUS
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
• REGULATOR PCB assy
Ref. No. Part No. Description
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,
W001 8276 7730 10 Cable assy, 3P, WHTMT/F-MT/BS, L100
E101, 102 N/A
• SW PCB assys
Ref. No. Part No. Description
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
Abbreviation
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
8274 2440 00 PCB Assy, Regulator, DS-8
8251 9660 02 Plain PCB, Regulator, DS-8
8274 2450 00 PCB Assy, SW, DS-8
8251 9660 03 Plain PCB, SW, DS-8
+80-20%, YF
3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST
DS-8 OVERALL EXPLODED VIEW & 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
5
Page 6
DS-8 DS-8
D1
J2
POWER SW
C2
13
J5
1
U91
1
W1
C92
W4
R17
R37
R27
D12
L11
L21
L2
L1
W3
U3
8
1
C8
U4
8
1
C9
C4
C4
L24
L23
R28
T21
C27
R18
L22
L13
L14
C17
L12
T11
C3
C53
R56
R55
C6
R57
R23
C21
C43
C22
R46
R24
R45
R47
C33
R36
R35
C23
R26
R25
C13
R16
R15
R21
D21
C26
R22
R11
C16
R12
12
D11
U1
8
1
R13
C11
C12
R14
1
17
U2
8
8
1
C7
C5
J4
DC IN
J1
OUT7
U52
C55
OUT6
U42
C45
OUT5
U32
C35
OUT4
U22
C25
OUT3
U12
C15
C24
J12
OUT1
C14
IN7
U51
IN6
U41
IN5
U31
IN4
U21
IN3
U11
IN2
J11
D22
IN1
DS-8 PCB ASSEMBLIES
• Parts Side of MAIN / REGULATOR / SW PCB assys
S1
C1
R1
8251966 001
MAIN,DP-8
C65
R67
R65
R66
C69
3
C91
3
U62
U61
8251966 002
D2
OUT8
IN8
REGULATOR,DP-8
D12
J11
2
IN1
4
IN2
J3
1
003
8251966
W2
17
5
1
5
1
5
1
5
1
5
1
5
1
5
1
5
1
SW ,DP-8
6
S81
10
6
S71
10
6
S61
10
6
S51
10
6
S41
10
6
S31
10
6
S21
10
6
S11
10
OUT1 J12
OUT2
IN3
U11
IN4
U21
IN5
U31
IN6
U41
IN7
U51
2
4
OUT3
U12
OUT4
U22
OUT5
U32
OUT6
U42
OUT7
U52
B
S
123
123
123
123
123
C14
C24
123
123
123
123
123
P
D11
1
L11
R11
D22
3
L21
R17
R15
R16
C13
R27
R25
R26
C23
R37
R35
R36
C33
R47
R45
R46
C43
R57
R55
R56
C53
C3
L14
1
L13
R18
3
L23
L24
C4
C45 C35 C25 C15
C55
W3
L1
W4
L2
J1
D2
R2
R28
R12
C26
C16
T11
T21
L12
L22
R22
1
R24
C22
C21
R23
C6
C17
C27
J4
2
C5
C7
1
1
U2
8
8
17
1
J2
R14
C12
C11
R13
1
1
U1
8
8
1
C92 C91
1
3
C63
3
R66
R65
R67
R1
POWER SW
3
IN8
312
U61
OUT8
312
C65
S1
U62
D2
U91
W1
J5
1
C2
C9
1
U4
8
C8
1
U3
8
D1
C1
1
10
S11
5
6
1
10
S21
5
6
1
10
S31
5
6
1
10
S41
5
6
1
10
S51
5
6
1
10
S61
5
6
1
10
S71
5
6
1
10
S81
5
6
17
W2
1
J3
• Foil Side of MAIN / REGULATOR / SW PCB assys
76
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