41
DJM-900NXS
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.4 VOLTAGE MONITORING CIRCUIT
Voltage-Monitoring Circuit
This unit monitors the voltages of the main power-supply ICs, using the
V
DET signal.
The
V
DET signal level is middle (+1.08
V
to +1.32
V
) during normal operations. When the level becomes outside the middle
level, as shown in the table below, an error is informed to the MAI
N
CPU (IC2011).
Product behavior when an error is generated
Upon reception of the
V
DET signal that informs of power failure, the MAI
N
CPU sets the P-CO
N
signal to Low and stops the
switching-system output from SW power.
The MAI
N
CPU also informs of power failure with flashing of the LFO FORM button, by sending the STBY_LED signal:
Flashing intervals: 250 ms (lit for 125 ms/unlit for 125 ms)
As the switching-system output is stopped, the indications other than the LFO FORM button are unlit and all the switches
and
V
Rs are disabled.
Schematic diagram of the voltage monitoring section
MAI
N
ASSY
POWER SUPPLY ASSY
V
oltage
monitoring
circuit
V
MUTE
V
+12D
V
+15A
V
-15A
V
+5A
V
+34D
V
+12D
V
+5D
V
+3R3D
V
+2R5D
V
+1R2D
V
+15A
V
-15A
V
+5A
The MAI
N
_CPU controls
power output.
Monitoring
V
DET
H: Abnormal
Mid:
N
ormal
L: Abnormal
IC1404
P-CO
N
H: SW power is output.
L: SW power output is stopped.
V
+12E
V
+3R3E
Always output during power-on
P
N
LA ASSY
STBY_LED
Flashing when
an error occurs
MAI
N
_CPU
(IC2011)
Analog voltage abnormality detect circuit
A side
A side
D 1 2 0 1
1 S S 3 0 1
G
N
DD
G
N
DD
LTC124EUB
Q1205
LTA124EUB
Q1206
H
N
1A01FU(YGR)
Q1201
(2/2)
3
5
4
H
N
1 A 0 1 F U ( Y G R )
Q 1 2 0 1
( 1 / 2 )
6
2
1
R1207
10k
(F)
R1204
10k
R 1 2 0 9
1 k
R 1 2 2 2
0
R 1 2 1 0
N
M
R1208
22k
(F)
R1202
11k
(F)
R1221
10k
R1203
20k
(F)
V
A D E T
V
- 1 5 A _ 1
V
- 1 5 A _ 1
V
+ 1 5 A _ 1
V
+ 5 A
V
+ 5 A
V
+ 1 2 D
V
A D E T
3 : 2 C
To Power Block
S T B Y
V
- 1 5 A
- 1 1 . 8 2
V
9 . 9 4
V
- 5 . 9 6
V
1 6 . 7 4
V
L o w v a l u e
V
+ 9 H P
V
- 9 H P
V
+ 1 5 A
4 . 2 8
V
5 . 6 1
V
8 . 2 3
V
1 3 . 3 8
V
H i v a l u e
V
+ 5 A
- 1 1 . 8 3
V
- 1 8 . 5 7
V
LFO FORM LED
D6624 (RED)
G
MAIN ASSY
Содержание DJM-900NXS
Страница 10: ...10 DJM 900NXS 1 2 3 4 A B C D E F 1 2 3 4 2 2 PANEL FACILITIES ...
Страница 11: ...11 DJM 900NXS 5 6 7 8 5 6 7 8 A B C D E F ...
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Страница 20: ...20 DJM 900NXS 1 2 3 4 A B C D E F 1 2 3 4 4 3 DSP BLOCK DIAGRAM ...
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Страница 189: ...189 DJM 900NXS 5 6 7 8 5 6 7 8 A B C D E F ...
Страница 192: ...192 DJM 900NXS 1 2 3 4 A B C D E F 1 2 3 4 A SIDE B A INPUT ASSY CN4003 CN4002 CN5001 CN5401 ...
Страница 193: ...193 DJM 900NXS 5 6 7 8 5 6 7 8 A B C D E F A SIDE B LF DWX3193 INPUT DWX DNP2625 B CN6201 CN4201 CN4601 1 ...