Kenwood KS-303HT, SW-22HT, SW-25HT Service Manual

POWER SUBWOOFER

70%

Subwoofer(SW-22HT/SW-25HT)

System Subwoofer system with built-in amplifier

Audio

Output Power

50 Watts RMS, at 4Ω from 40 Hz to 160 Hz with no

more than 0.09% total harmonic distortion

section

Input Sensitivity/Impedance

100 mV/43 kΩ, 200 mV/43 kΩ (MONO)

RCA-type pin-plug jack (LINE IN): Push-type terminals:

1.8V/1.2 kΩ

Turn Over Frequency

80 Hz ~ 160 Hz

Phase Switching

NORMAL, REVERSE

Enclosure

Bass-Reflex

Speaker

Loudspeaker

200 mm (8") Cone type

section

Nominal Impedance

4 Ω

Frequency Response

40 Hz ~ 250 Hz

Power Consumption

110 W

Supply Voltage

AC120 V, 60 Hz

Dimensions Width:

286 mm (11-1/4")

General

Height:

368 mm (14-1/2")

Depth:

356 mm (14")

Net Weight

11.2 kg (24.7 Ib)

Enclosure Finish

High density particle board Iaminated with simulated

wood grain vinyl.

Front speaker, Center speaker, Rear speaker

Front speaker Center speaker Rear speaker

system 2 way 2 way 1 way

(Magnetically shielded) (Magnetically shielded) Enclosure Acoustic Air Suspension Acoustic Air Suspension Acoustic Air Suspension Loudspeaker 100 mm(4") Cone type

(Full Range type)

Woofer: 100 mm(4") Cone type 100 mm(4") Cone type –

Tweeter: 50 mm(2") Cone type 50 mm(2") Cone type – Nominal Impedance 8 Ω 8 Ω 8 Ω Peak Input Power – 80W 80W Maximum Input Power 80W 40W 40W Sensitivity 88dB/Wat 1m 88dB/Wat 1m 85dB/Wat 1m Frequency Response 100Hz ~ 20,000 Hz 100Hz ~ 20,000 Hz 100Hz ~ 20,000 Hz Crossover Frequency 3,000 Hz 3,000 Hz –

129mm(5-1/16") 129mm(5-1/16") 129mm(5-1/16") Height: 198mm(7-13/16") 198mm(7-13/16") 198mm(7-13/16") Depth: 120mm(4-3/4") 120mm(4-3/4") 120mm(4-3/4")

Net Weight 1.2kg(2.6Ib)/piece 1.0kg(2.2Ib) 0.8kg(1.8Ib)/Piece

NOTE: THE GRILLES ON ALL SPEAKERS CANNOT BE REMOVED.

Notes:

1. Kenwood follows a policy of continuous advancements in development. For this reason, specifications may be changed without notice.

2. Full performance may not be exhibited in extremely cold locations (below 0 deg. C).

KS-303HT/SW-22HT/25HT

SERVICE MANUAL

REVISED

Grille ass'y (B06-1481-08)

RCA jack x2 (E63-0213-08)

Switch push (S68-0206-08)

Control rotary (R31-0419-08)

Control rotary (R31-0418-08)

Slide switch (S62-0213-08)

KS-303HT is bundled up satellite speaker. SW-22HT and SW-25HT are Subwoofer only.

Speaker jack (E70-0204-08)

SPECIFICATIONS

Dimensions Width:

LED (B30-1832-08)

Fuse holder (J13-0212-08)

Switch rocker (S66-0204-08)

AC power cord (E30-5857-08)

AC power cord bushing (J42-0243-08)

Pin-plug cord (1) (E30-5839-08)

Cushions (4) (G13-1141-08)

(KS-303HT and SW-22HT)

Speaker wires (5) (W01-1088-08)

(KS-303HT only)

KS-303HT/SW-22HT/25HT

1 x3

2

1 x3

CONTENTS / ACCESSORIES

Accessories

SCHEMATIC DIAGRAM ............................................ 5

EXPLODED VIEW ......................................................9

PARTS LIST..............................................................10

DISASSEMBLY FOR REPAIR

How to Remove the Grille Ass'y

1. You need to remove the grille ass'y if replace the subwoofer.

2. Insert the screw driver to the gaps of the grille ass'y and lift it up.

How to Remove the Amplifier

1. Remove screws fixed the rear panel to the enclosure.

2. Remove screws fixed the rear panel to the amplifier cover.

2

ACEG IBDFHJ

CROSSOVER

OUTPUT

VOLUME

PHASE

INPUT

FROM AMPLIFIER

TO SPEAKERS

B

E

E B

B

E

B

E

B

E

B

E

B

E

B

E

B

E

B E

B

E

B

E

B

E

B

E

B

B E

B

E

R604

C601

C603

R401

J130

C402

J146

J156

J143

RB601

R414

C404

R162

C151

P501

G

R412

1

R515

R514

C506

R513

B

E

JW604

R411

R407

J145

C602

J142

C137

C508

C141

R408

R160

J127

J126

C158

R409

R510

C504

C410

R501

J155

R511

J152

J151

C152

J128

L101

R403

C139

C136

R404

R153

R406

R405

R509

R151

B

E

J139

C132

R155

C156

R156

R506

J147

R507

J141

R161

J133

R159

C403

J144

C135

C150

J134

C133

R154

J132

J157

C138

R508

C502

J135

R504

C530

R503

IG

R502

J138

P61

R152

C501

R606

JW601

R416

R608

R607

R605

RL101

J603

R601

R602

R603

P62

R610

R609

R611

C604

C605

J137

C408

J136

R413

R417

C405

C407

T2

C406

J153

R410

R415

R402

T1

C401

J140

R505

J150

C155

ZD401

C159

C157

J131

C131

J154

SPK GND

OI

4

8

5

O

1

6

13

12

R111

C114

R102

J112

ZD101

C153

C154

C115

C116

C119

C122

R137

R136

E

R105

J148

7

E

6

B

C103

R178

R107

R109

R134

R138

R140

AUTO POWER SW

1

2

R133

R130

8

R129

R164

R157

R139

R158

P502

R132

1

J101

C121

R131 C120

B

E

R106

R110

J149

R179

R177

C105

R108

C104

C102

R104

+

L

C101

J106

C117

J105

J103

R128

4

E

B

5

R135

C123

J102

R120

C118

R126

J104

R127

R165

J107

J108

J109

C142

R103

C113

J111

J110

R113

C106

1

6

C149

R116

C110

C107

R112

R118

J125

J123

VR101

3

J114

R101

9

J118

J117

5

1

J122

2

R176

4

1

J129

C148

R168

C111

R125

C112

1

J116

R124

J113

14

J115

R167

R114

J121

J119

J120

R123

7

C108

C109

R122

R115

8

R119A

R119

J124

R181

R180

C124

R117

VR102

R183

L

C140

9

C147

1

C146

P102

R184

12

D602

CN601

Q502

Q603

Q605

Q604

Q602

Q601

IC105

IC501

Q109

D502

Q408

Q107

D501

D105

Q108

Q501

Q401

D102

ZD103

Q409

D103

D104

Q405

Q402

IC104

CN104

CN101

Q406

CN102

BD101

D601

Q404

Q403

Q407

D401

IC102

JK102

HIGH LEVEL INPUT HIGH LEVEL OUTPUT

LOW

LEVEL

INPUT

LOW

LEVEL

OUTPUT

VOLUME

CROSSOVER

PHASE

CN103B

Q101

SW101

LD101

Q102

D101

Q110

D109

Q115

RIB104

CN103A

SW102

P101

JK101

IC101

JK103

PC BOARD(Component side view

)

1

POWER IC TYPE POWER TRANSISTOR TYPE

2

3

4

5

6

7

Refer to the schematic diagram for the value of resistors and capacitors.

3 4