Detection Circuit - Kenwood KAC-X10D Service Manual
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- Instruction manual (12 pages)
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Abnormal Detection Circuit
It compares signal levels of the current detecting circuit and
output voltage rectification circuit with a comparator. If current
> voltage, the detecting circuit operates to stop D-class cir-
cuit.
In the current detecting circuit, current flows into only one side
of the detecting resistance when one side of output is dead-
shorted to GND.
+B
FET
CURRENT
DETECTION
FET
-B
1Ω Detection Circuit
The detecting circuit operates and limits the input signal when
the level sent from the current detecting circuit exceeds a cer-
tain level. (Diode clip)
It detects at the current level that flows only when 1Ω is ap-
plied, and does not cancel unless P-con is turned off. (Latch
circuit)
CIRCUIT DESCRIPTION
R381
1K
TP259
Q326
R374
Q327
3.3K
R377
Q337
TP238
TP405
2.2K
TP241
R409
Q338
Q339
3.6K
Q328
TP261
It detects also unbalance operation.
Resonance detecting signals detected with the new circuit
description X10D_2 are also input to this circuit causing ab-
normal detection.
+5V
+15VA
IC31
5
4
V-
6
3
2
DETECTION
7
CIRCUIT OUTPUT
8
1
Hi/Lo (NORMAL : Hi)
V+
R434
TP407
10K
-15VA
TP260
IC32
D342
5
4
V-
6
3
2
7
8
1
V+
RESONANCE
DETECTION SIGNAL
+15VA
TP278
TP277
R399
R400
20K
TP279
20K
R401
20K
R403
R402
R398
D329
10K
6
1K
7
5
TP282
Q329
IC35
IC35
(2/2)
(1/2)
TP283
OUTPUT VOLTAGE
RECTIFICATION CIRCUIT
INPUT SIGNAL
(for SMALL SIGNAL)
IC13
5
4
V-
6
3
2
7
8
1
V+
TP184
C351
Q336
R847
1
R436
1K
1K
TP398
TP397
RATCH CIRCUIT
KAC-X10D
+15V
-15V
TP281
TP280
12K
R405
20K
8
2
1
3
4
POWER AMP
+ OUTPUT
INPUT SIGNAL
(to POWER AMP)
R95
R67
3.9K
5.6K
TP144
R428
TP145
10K
3
8
R427
1
6
2
7
5
10K
4
IC38
(2/2)
IC38
(1/2)
CURRENT
DETECTION LEVEL
DIOD CLIPER
5
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