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ORDER NO.
PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936
PIONEER CORPORATION 2005
RRV3174
T ­ ZZK JULY 2005 Printed in Japan
S-ST550
XTW/EW
SPEAKER SYSTEM
Center
Surround
Front
This product is component of system.
Component
System
Service Manual
Remarks
DVD RECORDER HOME CINEMA SYSTEM
RCS-55
AUDIO MULTI-CHANNEL RECEIVER SUBWOOFER
SX-SW55/WYXCN, WVXCN
RRV3158
DVD RECORDER
DVR-230-AV/WYXV, WVXV
RRV3230
SPEAKER SYSTEM
S-ST550/XTW/EW
RRV3174
This service manual
FOR PRECAUTION OF
REASSEMBLY AND DISASSEMBLY
CS Assy ( Front )
The grille assy is attached to the cabinet by 4 screws. To detach
it, unfasten those screws.
The speaker unit, together with the Grille, is attached to the
cabinet by 4 external screws.
To detach it, first unfasten those screws. Next remove the cabi-
net. Then remove the cable.
When attaching it, face its terminal downward.
CS Assy ( Surround )
The grille assy is attached to the cabinet by 4 screws. To detach
it, unfasten those screws.
The speaker unit is attached to the Grille by 4 internal screws.
To detach it, first unfasten those screws. Next remove cabinet.
Then remove the cable.
When attaching it, face its terminal downward.
CS Assy ( Center )
The grille assy is attached to the cabinet by 4 screws. To detach
it, unfasten those screws.
The speaker unit, together with the Grille, is attached to the
cabinet by 4 external screws.
To detach it, first unfasten those screws. Next remove the cabi-
net. Then remove the cable.
When attaching it, face its terminal rightward.


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2
1
23
4
12
3
4
C
D
F
A
B
E
S-ST550
Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
The
mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
NOTES:
PARTS LIST
7
5
1, 2
5
3
4
6
6
NSP
1 CS Assy (Front)
SMW1857
NSP
2 CS Assy (Center)
SMW1864
NSP
3 CS Assy (Surround)
SMW1858
NSP
Model Label (FL)
SAN3697
NSP
Model Label (FR)
SAN3698
NSP
Model Label (SL)
SAN3699
NSP
Model Label (SR)
SAN3700
NSP
Model Label (C)
SAN3701
NSP
4 Accessory Set
SEA1683
NSP
Screw Set
SEA1676
Screw
BMZ50P120FNC
Polyethylene Bag S0
SHL1314
Non Skid Pad
SEC1912
Non Skid Pad
SEP6002
Mounting Bracket
SNN1047
Poly Bag S1
SHL1429
5 Protector
SHA2508
6 Polyethylene Bag S2
SHL1417
7 Packing Case
SHG2658
For Packing
Mark No.
Description
Part No.
NSP
Cabinet
SNK2840
Grille
SMG1835
NSP
Badge 28
SAM1506
NSP
Grille Cloth
SAS1588
NSP
Baffle
SNK2843
Connecting Cord (Plug: White)
SDD1334
Connecting Cord (Plug: Red)
SDD1335
Speaker
K77DC55-52D
Screw (for Cabinet)
BPZ35P120FNI
CS ASSY (Front)
Mark No.
Description
Part No.
NSP
Cabinet
SNK2840
Grille
SMG1837
NSP
Badge 28
SAM1506
NSP
Grille Cloth
SAS1588
NSP
Baffle
SMK2843
Connecting Cord (Plug: Green)
SDD1338
Speaker
K77DC55-52D
Screw (for Cabinet)
BPZ35P120FNI
Mark No.
Description
Part No.
CS ASSY (Center)


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3
1
23
4
1
2
3
4
C
D
F
A
B
E
S-ST550
SCHEMATIC DIAGRAM
3. CS assy ( Center )
White with Gray Line
White
Speaker
INPUT PLUG
( Green )
Connecting Cord (SDD1338)
White with Gray Line
White
Speaker
INPUT PLUG
PLUG color
SDD1334: White
SDD1335: Red
White with Gray Line
White
Speaker
INPUT PLUG
1. CS assy ( Front )
Connecting Cord (SDD1334, SDD1335)
2. CS assy ( Surround )
Connecting Cord (SDD1336, SDD1337)
PLUG color
SDD1336: Blue
SDD1337: Gray
NSP
Cabinet (L)
SNK2841
NSP
Cabinet (R)
SNK2880
Grille
SMG1836
NSP
Badge 28
SAM1506
NSP
Grille Cloth
SAS1589
NSP
Baffle
SNK2844
Connecting Cord (Plug: Blue)
SDD1336
Connecting Cord (Plug: Gray)
SDD1337
Gasket
SEC1910
Speaker
K77DC55-51D
Screw (for Speaker)
BPZ35P080FNI
Screw (for Cabinet)
BPZ35P120FNI
Mark No.
Description
Part No.
CS ASSY (Surround)


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4
1
23
4
12
3
4
C
D
F
A
B
E
S-ST550
PRODUCT APPEARANCE
CS ASSY ( Front and Center )
Screw
(M3.5x12)
Speaker
1
1
1
Part
Name
No.
Num.
Cabinet
Grille
Assy
Model
Label
Connecting
Cord
1
2
3
4
5
6
1
1
4
CENTER
SP
Front
FRONT
SP
Front
WHITE
WITH
GRA
Y
LINE
WHITE
1
1
2
2
3
3
4
5
6


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5
1
23
4
1
2
3
4
C
D
F
A
B
E
S-ST550
CS ASSY ( Surround )
6
ONLY
SURROUND-R
ONLY
SURROUND-L
2
3
7
9
8
White
White
with
Gray
Line
4
5
Num.
No.
Part
Name
Cabinet
1
1
4
1
1
Connecting
Cord
Speaker
1
1
4
Screw
(M3.5x8)
Screw
(M3.5x12)
Grille
Assy
Model
Label
Glue
(ZBA-5119)
1
2
3
4
5
6
7
8
9
10
Gasket
1