KEF PSW-2000 Service manual
SERVICE MANUAL
CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
PARTS LIST:
PRE AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-10
POWER AMPLIFIER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11
VOLTAGE SELECTOR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
PRE AMP AND POWER AMP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
8” SPEAKER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
POWER CORD CABLE ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-16
PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
EXPLODED VIEW DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-19
POWERED SUBWOOFER
POWERED SUBWOOFER
2
SPECIFICATIONS
System Specifications
Frequency Response 70-20K Hz
Sensitivity 85+/-2dB
Power Handling 70W Max
Dimension (W x D x H) 198 x 130 x 150 mm
Weight 2.1kg
HF 12mm (0.5") tweeter
LF 100mm (4")
Crossover Frequency 3KHZ
Impedance 4 OHM
Woofer Specifications
Rated Impedance 3.8 ohms +/- 0.8 at 1V 500 Hz
Voice coil DCR 3 +/-0.15 ohm
Sweep Test Sine Wave 4V at 20-20K Hz
Resonant Frequency (Fo) 65 +/- 15 Hz
Sensitivity 85 dB/W/m
Rated Power Input 30W
Maximum Power Input 60W
Power Test 15W Music Max/Channel
30W RMS/Channel
(The rated power is verified by performing power handling test by feeding
rated output with "IEC268-5" for 8 hours)
Main Magnet Ø74 x Ø38 x 15mm
Bucking Magnet Ø55 x Ø26 x 9mm
Tweeter Specifications
Rated Impedance 4+/-0.8 OHM at 1V 5K Hz
Voice coil DCR 3.2 +/-0.16 OHM
Sweep Test Sine Wave 1 V at 500-20K Hz
Resonant Frequency (Fo) 2500 +/- 240 Hz
Sensitivity 89 +/-2dB/W/m
Frequency Response Fo - 20K Hz
Rated Power Input 30W
Main Magnet Ø10 x 2mm
Magnet Material N35
3
POWERED SUBWOOFER
SPECIFICATIONS
Subwoofer Specifications
Typical LIMIT UNIT
1) CONTINUOUS POWER 120 115 W
(@ 90Hz, 0.1% THD)
2) THD (@90Hz 110W ) 0.08 0.09 %
3) CLIPPING POWER
(Output 1% THD @ 90Hz ) 125 120 W
4) INPUT SENSITIVITY
@ 120W 4 ohm 70Hz
LINE . INPUT VOL . Max 95 +/-10% mV
SPK . INPUT VOL . Max 0.8 +/-10% V
5) S/N @ 12W 75Hz 90 85 dB
@ 120W 75Hz 100 95 dB
( A-WEIGHT, LINE INPUT )
6) LOW PASS FILTER @ 75Hz
Freq VOL Set to Max. Low -3dB 50 +/-10% Hz
Freq VOL Set to Max. Upper -3dB 115 +/-10% Hz
7) LOW PASS FILTER @ 60Hz
Freq VOL Set to Min. Low -3dB 45 +/-10% Hz
Freq VOL Set to Min. Upper -3dB 80 +/-10% Hz
8) LOW PASS FILTER ROLL-OFF
Freq VOL Set to Max. 22 +/-2 dB
9) LOW PASS FILTER ROLL-OFF
Freq VOL Set to Min. 22 +/-2 dB
10) LINE OUTPUT @1V INPUT
HI PASS FILTER -3dB
( LINE IN @ 1KHz )
Freq VOL Set to Max. 170 +/-10% Hz
Freq VOL Set to Min. 70 +/-10% Hz
11) LINE OUTPUT @1V INPUT
HI PASS FILTER ROLL-OFF
LINE IN @ 1KHz
( 0 dB O/P Ref )
Freq VOL Set to Max. 12 +/-2 dB
Freq VOL Set to Min. 18 +/-2 dB
12) LINE OUTPUT
LINE IN @ 1KHz 1V INPUT
( 0 dB O/P Ref )
Freq VOL Set to Max. 1.2 +/-10% V
POWERED SUBWOOFER
4
SPECIFICATIONS
13) SPEAKER OUTPUT
HI PASS FILTER -3dB 130 +/-10% Hz
( SPEAKER IN @1KHz )
@ 4 ohm Load
14) SPEAKER OUTPUT
HI PASS FILTER ROLL-OFF 7 +/-1 dB
SPEAKER IN @ 1KHz
@ 4 ohm Load
( 0dB 1W 0/P Ref )
15) INPUT IMPEDANCE RCA 25K 15K OHM
SPEAKER 200 +/-10 OHM
16) AUTO TURN ON LEVEL 2.5 +/-1 mV
17) AUTO OFF DELAY TIME 50 40 Min
18) PHASE ADJUSTABLE 0- 180 0-170 Degree
@ 75-85Hz 10V O/P 0 Degree Ref:
PHASE VOL SET Min to Max
19) HUM & NOISE ( 17Hz -17KHz Filter ) 3 5 mV
1OK OHM LOAD @ INPUT
LEVEL VOL SET to Max
FREQ VOL & PHASE VOL SET to min
20) Current Consumption
UL 115 Vac @ 120W OUTPUT 2.0 2.5 A
@ IDLE .07 .09 A
CE 230 Vac @ 120W OUTPUT 1.5 2.0 A
@ IDLE .04 .06 A
UK 230 Vac @ 120W OUTPUT 1.5 2.0 A
@ IDLE .04 .06 A
5
POWERED SUBWOOFER
SPECIFICATIONS
POWERED SUBWOOFER
6
SPECIFICATIONS
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