Circuit Description - Kenwood KAC-X10D Service Manual
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Also See for KAC-X10D:
- Training manual (52 pages) ,
- Instruction manual (21 pages) ,
- Instruction manual (12 pages)
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KAC-X10D
NF Circuit
It applies NF from rear and front of LC filter. For BTL output, it
receives each output by differential amplification and applies
feedback to the first phase.
Resonance Detection Circuit
It detects resonant waveforms generated at output when the
power AMP ± output is dead-shorted (0Ω).
It sends detected signals to the control circuit.
D347 D346
R439
R438
C352
47K
47K
3300P
2
1
R446
C358
3
47K
3300P
IC39
C353
C354
C355
(1/2)
0.01
0.033
0.033
RESONANCE WAVEFORM
PICK UP LPF
4
CIRCUIT DESCRIPTION
POWER AMP OUTPUT +
(RECTANGULAR WAVE)
POWER AMP OUTPUT -
(RECTANGULAR WAVE)
IC10
(2/2)
R107
5
SIGNAL INPUT
10K
7
6
TP161
C59 56P
R106
C60
1M
1000P
IC17
(1/2)
8
R172
1
1K
R171
NF SIGNAL LINE
3.3K
TP254
POWER AMP OUTPUT +
(SINE WAVE)
POWER AMP OUTPUT -
(SINE WAVE)
R442
2.2K
IC39
(2/2)
R443
R445
5
8
D348
to CONTROL
1K
1K
7
6
CIRCUIT
4
TP246
L5
TP244
TP247
L6
TP245
R164 24K
TP252
TP250
R168
12K
R165 24K
3
2
R169
R166 24K
NF CIRCUIT
12K
R167 24K
TP251
Pulse Shaping Circuit
It detects with either one of abnormal detections (current volt-
age, resonance detection or unbalance current detection) at
the previous phase.
It generates a certain width of pulse about 10msec even if
input pulse width is small when input is pulled by Lo.
R381
IC31
1K
5
6
7
8
TP407
TP259
IC32
5
6
7
8
UNUSUAL DETECTION
CIRCUIT
POWER AMP OUTPUT +
(SINE WAVE)
POWER AMP OUTPUT -
(SINE WAVE)
DETECTION
CIRCUIT OUTPUT
Hi/Lo (NORMAL : Hi)
+5V
+15VA
R384
10K
4
TP263
V-
3
2
TP264
14
1
R385
C337
3
1K
2
0.047
1
V+
7
IC33
TP262
(1/4)
R434
10K
-15VA
PULSE DURATION
D342
SHAPING CIRCUIT
4
V-
3
2
1
V+
10mS
PALSE DURATION
OUTPUT
TP267
4
R386
6
5
10K
IC33
R387
(2/4)
1K
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- Service Manual
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