KENWOOD KACX650D Service Manual

Cover page of KENWOOD KACX650D Service Manual

Service Manual for KENWOOD KACX650D, downloadable as a PDF file.

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POWER AMPLIFIER
KAC-PS650D
SERVICE MANUAL
© 2002-3 PRINTED IN KOREA
B51-7935-00 (K) 3547
KAC-X650D
30
30
MONO(Lch)
STEREO
OPERATION
A.CH
B.CH
FILTER
A.CH HPF
FILTER FREQUENCY(Hz)
LPF
OFF
HPF
HPF
OFF
B.M.S.
+12dB
OFF
REMOTE
INPUT SELECTOR
GND
EXT.AMP.CONT.
LINE IN
L
R
L
R
SPEAKER
OUTPUT
POWERIN
P.CON
BATT.
GN
D
FU
SE
(3
0Ax2)
LEFT
BRIDGED
RIGHT
SUB
SUB
A
B
A
B
SUB
B
A
B
A
A
SUB
200
50
B.CH HPF
200
50
B.CH LPF
200
50
SUB.CH LPF
200
50
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POWER AMPLIFIER
KAC-PS650D
SERVICE MANUAL
© 2002-3 PRINTED IN KOREA
B51-7935-00 (K) 3547
KAC-X650D
30
30
MONO(Lch)
STEREO
OPERATION
A.CH
B.CH
FILTER
A.CH HPF
FILTER FREQUENCY(Hz)
LPF
OFF
HPF
HPF
OFF
B.M.S.
+12dB
OFF
REMOTE
INPUT SELECTOR
GND
EXT.AMP.CONT.
LINE IN
L
R
L
R
SPEAKER
OUTPUT
POWERIN
P.CON
BATT.
GN
D
FU
SE
(3
0Ax2)
LEFT
BRIDGED
RIGHT
SUB
SUB
A
B
A
B
SUB
B
A
B
A
A
SUB
200
50
B.CH HPF
200
50
B.CH LPF
200
50
SUB.CH LPF
200
50
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(X09-) IC22 : u-COM
PORT
No.
PORT NAME
I/O
FUNCTION
OPERATING CONDITION
1
+5V SW
O
Controls small-amount current.
"L" : SW 5V on.
2-
-
-
-
3
FAN
O
Controls fan rotation.
"H" : Fan on.
4-
-
-
-
5
D VOLTAGE
I
Detects class-D over-voltage.
"L" : Over-voltage detection.
6
V DOWN
I
Detects momentary power down.
"H" : Momentary power-down detection.
7
D CURRENT
I
Detects class-D over-current.
"L" (Class-D power on) : Over-current detection.
8
AB VOLTAGE
I
Detects class-AB over-voltage.
"L" : Over-voltage detection.
9
AB CURRENT
I
Detects class-AB over-current.
"H" : Over-current detection.
10
BLUE
O
Controls BLUE of variable illumination.
"H" : Illumination on.
11
GREEN
O
Controls GREEN of variable illumination.
"H" : Illumination on.
12
RED
O
Controls RED of variable illumination.
"H" : Illumination on.
13
TEST
-
-
-
14
RESET
-
Resets.
"L" : Reset.
15
XIN
-
-
-
16
XOUT
-
-
-
17
VSS
-
-
-
18
VAREF
-
A/D reference.
-
19
ADIN 1
I
Detects temperature.
"H" : Unusual temperature detection.
20
ADIN 2
I
Detects temperature.
"H" : Unusual temperature detection.
21
ADIN 3
I
Detects temperature.
"H" : Unusual temperature detection.
22
ADIN 4
I
Detects temperature.
"H" : Unusual temperature detection.
23
--
-
-
24
BASS 12dB
I
Stabilizes BMS +12dB.
"H" : BMS +12dB stabilization.
25
BASS REMO
I
Being remote-controlled from BMS head unit.
"H" : remote control available.
26
BASS OFF
I
Releases boost.
"H" : Boost off.
27
D POWER
O
Controls class-D amplifier.
"H" : Class-D amplifier on.
28,29
-
-
-
-
30
POWER
O
Controls power amplifier.
"H" : SW 14.4V on.
31
COM HU
I
Measures the head unit pulse.
-
32
OFFSET CON
O
Controls bass boost frequency offset.
"H" : Offset on.
33
BASS CON A
O
Controls bass boost frequency offset.
-
34
BASS CON B
O
Controls bass boost frequency offset.
-
35,36
--
-
-
37
STAND-BY
I
Cancels stop mode by P.CON on.
"L" : P.CON on or BACK-UP over-voltage detection.
38,39
--
-
-
40
VDD
-
VDD.
-
41
TACT SW
I
Switches color.
"H" : SW on.
42
MUTE 2
O
Controls driver stages.
"L" : Mute on.
43
MUTE 1
O
Controls amplifier input mute.
"L" : Mute on.
44
--
-
-
KAC-PS650D/X650D
2
MICROCOMPUTER'S TERMINAL DESCRIPTION
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KAC-PS650D/X650D
3
CIRCUIT DESCRIPTION
7
1K
1K
3
6
14
68P
R369
4.7K
C359
C358
6
1
2
68P
5
4
3
5
4
2
1
R368
8
7
14
9
10
11
R360
12
13
5V
4.7K
4.7K
R370
R371
UP-GATE
DOWN-GATE
C331
R351
R354
47P
C354
2.2K
47u25
C353
100K
R357
6800P
C371
R376
62K
R375
33K
1K
R355
0.1
+
10u16
1K
1K
R356
+
6
5
1.5K
R359
7
4.7K
R358
1800P
3K
4.7K
3
4
10K
R363
R366
8
2
820
R365
1
0.01
10K
R367
C357
1.5K
R364
OUTPUT
MUTE
680K
C352
R353
9
10
7
4
5
6
11
12
C356
R362
3
4
3
4
3
4
5
5
0
0
DEAD TIME
UP
DOWN
UP
5
D313
(2/4)
IC13
D312
IC13
(1/4)
IC12
(3/4)
D311
IC12
(1/4)
(2/4)
IC12
D310
(4/4)
IC12
IC10 (2/2)
Q13
D5
IC10
D305
D309
D306
(1/2)
(1/2)
IC11
: Triangular wave form
: Analogue signal
: PWM wave form
After PWM wave form
is divided into up-gate
and down-gate wave forms, this circuit makes
off-timing so that up-gate and down-gate wave
forms do not turn on at same time.
This circuit creates PWM wave form
after comparing triangular wave form
and analogue signal
.
Triangular Wave Former Circuit
PWM Wave Former
Dead Time Oscillation Circuit
2
1 receives mute signal from MUTE-2 terminal of u-COM,
and bias voltage of
is short-circuited, and driver transistors
and final transistors on X08- get in condition of non-operation,
and shock noise is prevented.
Shock Noise Prevention Circuit
2
1
R179
510
10u16
+
33
R183
VR5
1.8K
R129
10K
R452
R456
10K
10K
R517
R513
47
R514
47
6.8K
R457
6.8K
R458
10K
R453
R454
10K
47u25
1K
R516
+
u-COM
"MUTE-2"
10K
R451
C464
R448
10K
B
10K
R455
+B
220
C151
D153
D151
D435
Q429
Q426
Q427
Q428
D431
Q159
5
3
4
5
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KAC-PS650D/X650D
4
CIRCUIT DESCRIPTION
C373
0.82
C372
0.82
+
C369
33u50
+
70uH
C368
33u50
L302
47K
R497
C362
0.1
0.1
C363
C365
6800P
C370
0.82
1.5K
R503
10
1/2W
R378
10
1/2W
R388
R500
1.5K
680K
70uH
L301
C364
6800P
1.5K
R502
R501
R499
1.5K
R400
R397
R398
0.1
1/2W
R380
820
R392
47
R399
R394
R395
0.1
1/2W
R379
680
R391
47
0.01
C361
R361
1K
750
R377
1/2W
R390
1.5K
150
R382
R384
47K
1K
R389
120
510
1/2W
750
510
1/2W
DOWN-
GATE
UP-
GATE
47K
0.22
1/2W
R372
47K
R374
R373
R383
0.22
6
Q308
Q314
Q442
Q440
Q439
Q441
Q311
Q313
Q309
Q305
Q302
Q310
Q306
Q304
Q307
Q303
Q301
Q301-304 convert voltage of up-gate and down-gate to current.
R379,380 convert the current to voltage, and Q308-311 drive MOS-FETs Q313,314.
Swung PWM wave form is output to
±B on line 6 , and the swung PWM wave form
is converted to analogue signal by LC filter.
Class-D Amplifier
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KAC-PS650D/X650D
5
ADJUSTMENT (KAC-PS650D/X650D)
No.
ITEM
INPUT
SETTINGS
OUTPUT SETTINGS
RECEIVER
SETTINGS
ALIGNMENT
POINTS
ALIGN
FOR
FIG.
Connect a cassette receiver or other receiver.
1
IDEL
CURRENT
-
Connect a DC
voltmeter between
emitter terminals of
Q161,162,261,262
and J1 (SP.OUT,
L+/R-).
VOLUME : 0
VR5 (A-Lch)
VR6 (A-Rch)
VR7 (B-Lch)
VR8 (B-Rch)
(X09-)
2.5mV
(a)

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