KAC-X542
7
CIRCUIT DESCRIPTION
AD-I
(2/2)
IC6
(1/2)
IC6
AMP RECT
MPU AD-PORT
OUTPUT
VOLTAGE
DETECTION
LEVEL
10u35
270
1K
10K
7
5
6
15K
0.01
0.01
10K
1
8
1K
68
3
2
220
L5
4
+
10K
10K
J3
Q95
Q96
Q93
Q90
to Head unit
Head unit GND
CONSTANT
CURRENT
AMP
GND
from
MPU
3
4
2
1
11
7
8
12
6
10
5
9
13
47
47
REQC
Head unit-GND
100K
12K
1.5K
1.5K
20K
IC9
J4
D93
D91
to OTHER AMP
RECEIVE
TRANSMISSON
to MPU
TRANSMISSON
RECEIVE
BOTH DIRECTION
BUFFER
4
2
3
1
4.3K
4.3K
270
270
9
5
7
10
11
8
6
10u25
10K
1.8K
1.8K
VCC
SX
GND
RX
TX
TY
SY
RY
6
7
8
5
3
2
1
4
CLK
DATA
No.
Item
Alignment Point
Method
Align For
Note
Fig.
Connect a DC voltmeter between
VR5 (A-Lch)
the following emitter resistors.
PC BOARD
1
IDEL CURRENT
VR6 (A-Rch)
R347 (A-Lch)
2.5mV
Over 2 minutes
on page 10
VR7 (B-Lch)
R348 (A-Rch)
aging is required.
and 11.
VR8 (B-Rch)
R447 (B-Lch)
R446 (B-Rch)
ADJUSTMENT
●
Current detection circuit
Amplify and rectify potential differences at
two points in the primary-side current circuit
and send it to the AD-port of the MPU and
obtain data for displaying current value.
●
Constant current output circuit
Remove troubles caused by the potential
differences between the constant current
output and the GND, so that the GND po-
tential differences between the head unit
and the AMP is not overlapped in the AMP
to head unit communication.
●
I2C buffer
Using an IC for I2C communication, be-
tween-AMP communication is conducted so
that there will be no trouble from GND po-
tential differences.
