S-W20-K
1
PIONEER CORPORATION
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8655, Japan
PIONEER ELECTRONICS SERVICE, INC.
P.O.Box 1760, Long Beach, CA 90801-1760, U.S.A.
© PIONEER CORPORATION 2000
CONTENTS
1. SAFETY INFORMATION ............................................. 2
2. DISASSEMBLY ............................................................ 3
3. PACKING, EXPLODED VIEWS AND PARTS LIST ..... 3
4. SCHEMATIC AND PCB CONNECTION DIAGRAMS .. 6
5. PCB CONNECTION DIAGRAM ................................. 10
6. PCB PARTS LIST ...................................................... 13
7. ADJUSTMENT ........................................................... 15
8. PANEL FACILITIES .................................................... 16
9. SPECIFICATIONS ....................................................... 17
Service
Manual
ORDER NO.
PET99021
POWERED SUBWOOFER
S-W20
2
S-W20
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.
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 schematics and 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.
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 60Hz outlet and turn the AC power switch
on. Any current measured must not exceed 0.5mA.
(FOR USA MODEL ONLY)
Leakage
current
tester
Reading should
not be above
0.5mA
Device
under
test
Test all
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
Earth
ground
AC Leakage Test
S-W20
3
q
POWER AMP SECTION
· Remove the 8 screws from the power amplifier.
· Remove the connector lead, etc.
q
PLASTIC COVER
· The plastic cover is attached to the cabinet by its bosses
applied with adhesive. To detach it, pry it open by inserting
a flat blade scewdriver between the cabinet and the grille.
q
SPEAKER
· Remove each of the 4 screws
3. PACKING, EXPLODED VIEWS AND PARTS LIST
NOTES:
q
Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.
q
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.
q
Parts marked by "
" are not always kept in stock. Their delivery time may be longer than usual or they may be unavailable.
3.1 PACKING
Parts List
Mark No.
Description
Parts No.
1
Operating Instructions
272517
2
RCA Cable Accessory Pack
255245
3
Corner Pad Assy
275863
4
Poly Bag
275536
5
Packing Case
272502
2. DISASSEMBLY
1
2
3
4
5
S-W20
4
3.2 EXTERIOR SECTION
Parts List
NSP
1
Cabinet Enclosure
272562
NSP
2
Amplifier Assembly
272537
3
Plastic Cover
272428
4
Paper Port Tube
272557
5
Front Port Ring
275823
6
Rear Port Ring Assembly
275858
7
Transducer
272542
8
Foot
255116
9
Logo
267189
10
Screw (for Foot)
222539
11
Screw (for Amplifier and Trans.)
221904
Mark No.
Description
Parts No.
1
2
3
4
5
6
7
8
9
0
-
-
S-W20
5
A
A
11
17
21
19
4
5
21
6
21
5
5
5
9
1
7
15
16
7
3
10
11
10
2
12
8
18
14
20
13
3.3 POWER AMP SECTION
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.
÷ Screw adjacent to
mark on the product are used for disassembly.
7 EXTERIOR SECTION PARTS LIST
Mark No.
Description
Parts No.
Mark No.
Description
Parts No.
12
Rear Case
AMC7039
13
Mica Sheet
AEE7033
14
Vol Knob Assy
PXA1621
NSP
15
Vol Knob
PAC1951
NSP
16
Spring
PBH1229
17
Fuse ( FU 1 ) 5A
REK1067
18
Fuse Caution Label
ARW7083
19
ICP 65 Label
ARW7084
20
PBS Holder
ANG7329
21
Screw
IPZ30P120FMC
1
AC Power Cord
PDG1064
2
OPERATION ASSY
AWU7541
3
Operation Panel
ANC7917
NSP
4
Heat Sink
ANH7117
5
Screw
ABA1052
6
AMP ASSY
AWU7540
7
Screw
BPZ30P080FZK
8
Rear Case Assy
AXG7085
9
Cord Stopper
CM22C
10
Air Packing L
AEB7172
11
Air Packing S
AEB7174