Pioneer SW-8-ED Service manual

POWERED SPEAKER SYSTEM

S-W8

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

Type

LBXTW/E

WLXTW/E

Model

S-W8

Power Requirement

AC110 – 120V
AC220 – 240V

Remarks

ORDER NO.

RRV2540

CONTENTS

1. SAFETY INFORMATION

2. EXPLODED VIEWS AND PARTS LIST

3. SCHEMATIC DIAGRAM

4. PCB CONNECTION DIAGRAM

5. PCB PARTS LIST

6. ADJUSTMENT

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 2001

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11
18
19

2
3
8

7. GENERAL INFORMATION

7.1 DISASSEMBLY

8. PANEL FACILITIES AND SPECIFICATIONS

................................

...........................................

T – ZZV SEPT. 2001 Printed in Japan

....

20
20
21

S-W8

1. SAFETY INFORMATION

This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trained to properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may
void the warranty . If you are not qualified to perform the repair of this product properly and safely, you
should not risk trying to do so and refer the repair to a qualified service technician.

WARNING
This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to
cause cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 – Proposition 65

NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement
parts must be of identical designation.

REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que
les pièces de remplacement doivent avoir la même désignation.

(FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

The following check should be performed for the
continued protection of the customer and service
technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage
current tester such as Simpson Model 229-2 or
equivalent between the earth ground and all exposed
metal parts of the appliance (input/output terminals,
screwheads, metal overlays, control shaft, etc.). Plug
the AC line cord of the appliance directly into a 120V
AC 60 Hz outlet and turn the AC power switch on. Any
current measured must not exceed 0.5 mA.

Reading should
not be above

0.5 mA

Earth
ground

Device
under
test

Also test with
plug reversed
(Using AC adapter
plug as required)

Test all
exposed metal
surfaces

AC Leakage Test

Leakage
current
tester

ANY MEASUREMENTS NOT WITHIN THE
LIMITS OUTLINED ABOVE ARE INDICATIVE
OF A POTENTIAL SHOCK HAZARD AND
MUST BE CORRECTED BEFORE RETURN­ING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are
often not evident from visual inspection nor the
protection afforded by them necessarily can be obtained
by using replacement components rated for voltage,
wattage, etc. Replacement parts which have these
special safety characteristics are identified in this
Service Manual.

Electrical components having such features are
identified by marking with a
on the parts list in this Service Manual.
The use of a substitute replacement component which
does not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.

Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER
Service Manual. A subscription to, or additional copies
of, PIONEER Service Manual may be obtained at a
nominal charge from PIONEER.

on the schematics and

2

2. EXPLODED VIEWS AND PARTS LIST

NOTES:

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.
Screws adjacent to mark on product are used for disassembly.

S-W8

2.1 PACKING

5

7

1

2

3

4

6

8

9

PACKING PARTS LIST

Mark No. Description Part No.

1 Opearting Instructions SRA1377

(English,Spanish,Chinese)
2 Speaker Cord 4999A-869
3 RCA Plug Cord VRC0001-006
4 Ground Cord 4999A-868
5 Protector L ITF0064C001

Note : The parts without numbering
are not supplied as service parts.

Mark No. Description Part No.

6 Protector R ITF0065C001
7 Protector Front ITF0078C001
8 Packing Case (LBXTW/E type) ICC0027C003
8 Packing Case (WLXTW/E type) ICC0027C002
9 Polyethylene Bag IVP0001-132

3

S-W8

2.2 EXTERIOR

Refer to "2.3 AMP ASSY".

12

Amp Cover

20

12

(4pcs)

4

3

17

4

12

13

Note :
The No.1 Assy consists
of 2 PCB boards.

8

5

5

1

18

1

19

C

7

9

5

1

16

13

C

6

Note : The parts without numbering
are not supplied as service parts.

15

10

14

11

4

EXTERIOR PARTS LIST

Mark No. Description Part No.

1 POWER SW ASSY APE0485-031

2 • • • • • • • • •
3 Grille Assy AFA00160001
4 Sponge IVE0043C001
5 Screw PBZ30P060FZK

6 Rubber Bush BRB0003-002
7 Screw PBZ30P080FZK
8 Control Box BPC0010M001
9 Control Cover BPC0011M001

10 Screw BYC30P160FZK

11 Screw HZ00016-001
12 Screw SBA-153
13 Screw SBA-122
14 Washer HWT2280-210
15 Switch Rocker MVS0001-A11

16 Speaker A30IU50-51C
17 Passive Radiator DC-17G
18 Bracket GSE0093-001
19 Screw PMZ30P060FZK
20 Craft Paper ICT0003-001

S-W8

5

S-W8

20

30

8

9

11

38

10

39

5

40

4

1

14

12

32

33

31

36

27

13

35

13

6

7

24

22

16

15

15

2

D

F

B

A

Note : The parts without numbering
are not supplied as service parts.

2.3 AMP ASSY

6

S-W8

17

29

19

28

21

16

20

25

22

24

26

20

16

37

20

16

23

22

15

24

21

19

17

E

AMP ASSY PARTS LIST

Mark No. Description Part No.

1 HI LVL ASSY APE0485-021

3 POWER ASSY (LBXTW/E type) APE0474-001
3 POWER ASSY (WLXTW/E type) APE0474-002
4

4
5 D AMP ASSY APE0554-002
6 AC Power Cord (LBXTW/E type) 47455-077T
6 AC Power Cord (WLXTW/E type) 2559-022G22

3

2 CONTROL ASSY APE0485-011

POWER PCB ASSY (LBXTW/E type)

POWER PCB ASSY

7 Cord Bush DBU3050-018

8 Insulating Sheet GSI0001-001

9 Insulating Washer DSS0007-002
10 Shield Cover GTN0035-005
11 Screw PMZ30P100FNI
12 Screw PYC35P130FZK

13 Screw PBZ30P100FZK
14 Screw PMZ30P080FZK
15 Screw CMZ30P060FMC
16 Screw AMZ30P080FMC
17 Screw AMZ30P100FMC

18 Cord Bush DBU3050-019
19 Insulating Sheet GSI0003-002
20 Nut NA30FZK
21 Cover 001X0810001
22 Washer WA32W070D050

23 Spacer DSS0018-001
24 Plastic Screw D060301-006
25 Rubber Pad ICU0016-001
26 Cushion BRB0036-001
27 Washer WA72F120M050

28 Spacer DSS0024-001
29 Spacer DSS0017-006
30 Washer WH30FUC
31 Volume Knob BPK5018-004
32 Push Knob BPK8015-002

33 Washer HWC9060-005
34 • • • • • • • • •
35 Screw ABZ30P080FCU
36 Nut NK70FMC
37 Nut DPN5428-024

38 Sponge IVE0238-001
39 Sponge IVE0098-002
40 Heat Sink Assy AFA0082-006

(WLXTW/E type)

APE0484-001

APE0484-002

18

22

24

7

1

S-W8

3. SCHEMATIC DIAGRAM

A

INPUT

A

JK301

23

CONTROL ASSY (APE0485-011)

11.7V

4

OUTPUT

HI LVL ASSY
(APE0485-021)

SPEAKER LEVEL
INPUT/OUTPUT

B

RB958B
RB958A

CN958

CN957

B

JK303

RB402

CN956

C

C

T950

RB301B

RB954

6.2V

RB301A

6.2V

CN952

RL950
MRL2212-004(LBXTW/E type)
GJ-SH-112DM(WLXTW/E type)

10.5V

CN401

RB401

10V

CN411

RB403

100/16

100/16

CN901

L

L

N

N

*

B

J902

A

CN501

T1AH/250V

F903

POWER SW ASSY

(APE0485-031)

Only LBXTW/E type

*

J902 Short (LBXTW/E type : AC120V)

CN963

CN955

Only LBXTW/E type

D

J902 Open (WLXTW/E type : AC230V)

POWER PCB ASSY

CN953

L

D

8

A

B C D

1234

N

AC POWER
CORD

(APE0484-001 : LBXTW/E type)
(APE0484-002 : WLXTW/E type)

• NOTE FOR FUSE REPLACEMENT

CAUTION -

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE WITH SAME TYPE AND RATINGS OF FUSE.

E F

E

POWER ASSY
(APE0474-001 : LBXTW/E type)
(APE0474-002 : WLXTW/E type)

R922

5

678

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST"

S-W8

N401

N501

CN411

D AMP ASSY (APE0554-002)

[Wave A]

OSC

6.2V

5.2V

[Wave C]

20V

5.2V

[Wave B]

IC506 RCI4080-001

F

42V

Q503

RHM5506-001

Q505

RHM5506-001

Q502

RHM5506-001

[Wave D]

Q504

RHM5506-001

6.3V

·

21V

ª

21V

Take care for handling!
The output terminal operates
with DC standard level of 21V.

A

CN502

B

R922

: AUDIO SIGNAL ROUTE

WIRING SYMBOL
Nonflammable surfacing resistor symbol : FL

21V
42V

33

Mylar film capacitor symbol : MA

C

D

E

5

6

7

F

8

9

S-W8

WAVE FORM

LEADER MODEL-3100D

0V

[ Wave Form A]

IC504 Pin6 vlotage

H : 2µs/div
V : 0.2V/div

[ Wave Form B]

CH1

0V

IC504 Pin20 vlotage

H : 2µs/div
V : 2V/div

0V

[ Wave Form C]

IC504 Pin10 vlotage

H : 2µs/div
V : 2V/div

[ Wave Form D]

CH1

CH1

0V

D Amp output vlotage

H : 2µs/div
V : 2V/div

10

4. PCB CONNECTION DIAGRAM

NOTE FOR PCB DIAGRAMS:

1. Part numbers in PCB diagrams match those in the schematic
diagrams.

2. A comparison between the main parts of PCB and schematic
diagrams is shown below.

Symbol in PCB
Diagrams

BCE

Symbol in Schematic
Diagrams

BCE

BCE

Part Name

Transistor

3. The parts mounted on this PCB include all necessary parts
for several destination.
For further information for respective destinations, be sure
to check with the schematic diagram.

4. Viewpoint of PCB diagrams

Connector

Capacitor

S-W8

SIDE A

BCE

DGS

BCEBCE

DGSDGS

Transistor
with resistor

Field effect
transistor

Resistor array

3-terminal
regulator

P.C.Board Chip Part

SIDE B

11

1

S-W8

4.1 CONTROL ASSY

A

CONTROL ASSY

A

Note :
ICs and semiconductors
are NSP parts.

Q353

IC301

23

D

CN956

SIDE A

4

D

CN952

F

CN401

Q352

B

C

Q351

Q354

IC401

VR401

VR402

IC402

D

B

RB301B

12

A

1234

1

234

4.2 HI LVL ASSY and POWER SW ASSY

S-W8

B

HI LVL ASSY

C

POWER SW ASSY

A

RB301A

SIDE A

A

B

D

CN955

D

CN957

C

D

B

1

2

3

C

4

13

1

S-W8

4.3 POWER PCB ASSY

A

D

POWER PCB ASSY

Note :
IC and semiconductors
are NSP parts.

23

SIDE A

RB403

A

4

CN411

F

B

IC950

Q955 Q956 Q951

N

L

C

AC IN

CN963

C

D

CN958

C

CN901

E

14

D

1234

RB402

A

1

4.4 POWER ASSY

E

POWER ASSY

Note :
All parts are NSP parts.

234

S-W8

A

SIDE A

L, N

D

B

IC901 IC903

IC902 IC904

C

D

CN501

F

E

1

2

3

4

15

1

S-W8

4.5 D AMP ASSY

A

F

D AMP ASSY

23

SIDE A

4

A

RB954

D

B

RB401

A

RB403

C

Q505
Q504 Q502 IC502

D

16

F

1234

Q503

5

F

D AMP ASSY

678

S-W8

A

SIDE B

B

Note :
ICs and semiconductors
except IC506 are NSP parts.

5

6

IC505
IC504

Q509

IC506

7

Q514 Q513
Q512 Q511

F

8

C

D

17

S-W8

5. PCB PARTS LIST

NOTES:

LIST OF WHOLE PCB ASSEMBLIES

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.
When ordering resistors, first convert resistance values into code form as shown in the following examples.
Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J=5%,
and K=10%).

560
47k

0.5
1

Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).

5.62k RN1/4PC F562 x 10

56 x 10
47 x 103
R50
1R0

1

561
473

1

5621

RD1/4PU J
RD1/4PU J
RN2H K
RS1P K

561
473

R50

1R0

5621

Mark

POWER PCB Assy

D

Symbol and Description

CONTROL ASSY APE0485-011 APE0485-011
HI LVL ASSY APE0485-021 APE0485-021
POWER SW ASSY APE0485-031 APE0485-031

POWER PCB ASSY APE0484-001 APE0484-002
POWER ASSY APE0474-001 APE0474-002

D AMP ASSY APE0554-002 APE0554-002

S-W8/LBXTW/E

Part No.

S-W8/WLXTW/E

APE0484-001 and APE0484-002 are constructed the same except for the following:

Mark

NSP RL950 MRL2212-004 GJ-SH-112DM
NSP C972 PVSY159D222 Not used
NSP C973 PVSY159D222 Not used

POWER Assy

E

Symbol and Description

APE0484-001 APE0484-002

Part No.

APE0474-001 and APE0474-002 are constructed the same except for the following:

Remarks

Remarks

Mark

NSP J902 (A to B point connection) 4999A-808 Not used

18

Symbol and Description

APE0474-001 APE0474-002

Part No.

Remarks

S-W8

Mark No. Description Part No.

A

CONTROL ASSY

SWITCHES

SW401,SW402 SW Push MSP0001-025

RESISTORS

VR401(10KA) MRR0103-004
VR402(10KB) MRR0103-033

OTHERS

JK301 RCA Jack CJR6502-015

HI LVL ASSY

B

OTHERS

JK303 SPK Jack CBJ0208-002

C

POWER SW ASSY

POWER SW ASSY has no service part.

D

POWER PCB ASSY

OTHERS

F902 (Fuse : T5AH/250V) KHA2500-104
F903 (Fuse : T1AH/250V) KHA2100-104

6. ADJUSTMENT

There is no information to be shown in this chapter.

POWER ASSY

E

POWER ASSY has no service part.

F

D AMP ASSY

SEMICONDUCTORS

IC502 NJM7812FA
IC506 RCI4080-001
Q502-Q505 RHM5506-001

RELAY

RL501 MRL2212-005

19

S-W8

7. GENERAL INFORMATION

7.1 DISASSEMBLY

1. Removing the AMP ASSY

The Amplifier ASSY is attached to the back board by 12 external
screw 1. To detach it, unfasten those screws.

1

[Rear View]

1

1

3. Removing the Passive Radiator

The Passive Radiator is attached to the baffle board by 8 external
screw 2. To detach it, first remove the grille. Then unfasten those
screws.

4. Removing the Woofer

The W oofer is attached to the cabinet bottom by 8 external screw 3.
To detach it, first remove the outside bottom board by removing 4
hexagon socket screw 4. Then remove those screws 3.
When attaching the Woofer, face its terminal rightward.
And attaching the outside bottom board, face its larger flat side
frontward and attach with the hexagon socket screw 4.

1

2. Removing the Grille

The Grille is attached to the cabinet by catches. Detach by pulling
it toward you.

Cabinet

Grille

Passive Radiator

Switch Box

5. Removing the Switch Box

The Switch Box is attached to the bottom board by 2 external screw

5. To detach it, first remove the outside bottom board. Then remove
the audio reflector. The audio reflector is attached to the baffle board
by 4 external screw 6. Remove the audio reflector by removing
those screw 6. Then remove the Switch Box by removing the screw

5.

AMP ASSY

Screw for

AMP Cover

6

Audio Reflector

20

2

5

Woofer

3

Bottom Board

4

8. PANEL FACILITIES AND SPECIFICATIONS

5
4
3

6

7

0

­=

9

8

S-W8

Å

FRONT PANEL (Å)

1 Power switch (POWER)

When switched to the ON potision (right),
power is turned ON; when swiched back
again, power is turned OFF.

2 Power Indicator (STANDBY/ON)

When power is switched on, the power
indicator lights green. If no signal is present
for more than 9 minutes, the subwoofer
automatically reverts to standby mode and
the power indicator lights red. If,
subsequently, a signal is received, power
automatically comes back on and the
power indicator lights green.
÷ If you are not using the unit for an

extended period of time, please switch
off using the power switch, and make
sure that the power indicator goes out.

REAR PANEL (ı)

3 Phase switch (PHASE — 0˚/_ 180˚)

When depressed (_ 180˚), the output
phase becomes the reverse of the input
signal, and when raised (— 0˚ ), it is in the
same phase as the input signal.
÷ Normally, the switch is set to (— 0˚ ).

But when the sound connection between
the subwoofer and the left and right
speakers sounds unnatural, try switching
to 180˚ and set the switch in the position
where the sound is natural.

4 Line Level Output terminal

(LINE LEVEL OUTPUT)

Used for connecting other equipment
through the amplifier.

5 Line Level Input terminal

(LINE LEVEL INPUT)

Connects to the stereo amplifier’s
SUBWOOFER PRE-OUT terminal, with the
specially provided RCA plug cord.

6 Speaker Level Input terminals

(SPEAKER LEVEL INPUT)

Connect to the speakers output terminals
on the stereo amplifier, with the specially
provided speaker cords.

1

2

ı

7Speaker Level Output terminals

(SPEAKER LEVEL OUTPUT)

When the speakers output terminals on the
stereo amplifier are connected to this unit’s
SPEAKER LEVEL INPUT terminals 6 and
used as the unit’s input signal, these
terminals are used to connect the left and
right speakers via the unit.

88

8Signal ground jack

88

99

9Level knob (LEVEL)

99

Sets the subwoofer volume.
÷ Turn the knob slowly from the MIN

position.

÷ With this unit, the bass level can be

independently set, so do not turn up the
bass on the stereo amplifier.

0Turnover knob (TURNOVER)

Sets the high limit of the frequency played
back by the subwoofer.
÷ Setting Criteria

50Hz .........when the diameter of the left/

100Hz .......when the diameter of the left/

150Hz .......when the diameter of the left/

--

-Filter through switch

--

(Next to the turnover knob)

• There are two settings:

— OFF: Use with a regular subwoofer

_ ON: DVD audio bypasses the high

• Filter through switch: When switched to _
(ON), it will not bypass the filter in the
connected amplifier. Run the signal directly
to the subwoofer for a direct audio signal.

==

=AC power cord

==

Connect to a AC power outlet in the wall.

right speakers is 20 cm or
more.

right speakers is 10 – 25 cm.
right speakers is 12 cm or

less.

(Possible to set the high
frequency limit using the turnover
knob)

frequency filter (a direct audio
signal).

21

S-W8

SPECIFICATIONS

Cabinet ......... Flo o r t ype with PASSIVE RADIATOR system

Speaker (Woofer) ........................................ 30cm cone type

Speaker (PASSIVE RADIATOR) ................ 30cm cone type

Power Amplifier

Continuous Power Output (RMS).... 200W/4Ω (30-150Hz)

Total Harmonic Distortion ............................................. 0.3%

(30-150Hz, 4Ω, 50W)

Other models :

Above specifications are for when power supply is 230V.

Power Requirements

Other models ....................................... 220-230V ~, 50-60Hz

Taiwanese model................................ 110-120V ~, 50-60Hz

Power Consumption

Other models ................................................................... 55W

Taiwanese model.......................................................... 330W

Power Consumption in Standby mode............................ 1W

Taiwanese model :

Above specifications are for when power supply is 110V.

Input (sensitivity at 100Hz/impedance)

SPEAKER LEVEL...............................1.74V+1.74V/15kΩ)

(both channels in-phase)

LINE LEVEL (RCA jack) ...............................185mV/30kΩ)

Turnover Frequency ..... 50-1500Hz (continuously variable)

Outline Dimensions ........ 434(W) × 531.5(H) × 464 (D) mm

Weight (without package) ........................................... 31.5kg

Accessories

Seaker Cord x2

4999A-869 (L=3m)

Accessories

Speaker cords....................................................................... 2

RCA plug cord.......................................................................1

Ground cord ..........................................................................1

Operating instructions ..........................................................1

Note:

Specifications and design subject to possible modification
without notice,due to improvements.

22

RCA Plug Cord x1

VRC0001-006 (L=3m)

Ground Cord x1

4999A-868 (L=3m)