26
DJM-2000
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5.3 VOLTAGE MONITORING CIRCUIT
Voltage Monitoring
This unit monitors the voltages of the main power-supply units, using
V
DET signals.
The
V
DET signal level is middle (+1.08
V
to +1.32
V
) during normal operations. When the level falls outside the middle level,
as shown in the table below, microcomputer A (IC1105) is notified of an error.
Product behavior when an error is generated
Upon reception of a
V
DET signal that informs of power failure, microcomputer A sets the Pcon signal to Low and stops the
switching-system output from SW power. Microcomputer A instructs that the STA
N
DBY LED signal be sent so that the
UTILITY button will flash to notify the user of a power failure.
Flashing intervals: 250 ms (lit for 125 ms/unlit for 125 ms)
As the switching-system output is stopped, the indications other than the UTILITY button are unlit and all the switches and
V
Rs are disabled.
Diagnostic procedure
If any voltage is abnormal, that error will be detected by the voltage monitoring program after it is started after a usual start-
up of the unit. Then the SW power output will be stopped. For this reason, power will be supplied for about 10 sec after start-
up. Identify which power-supply IC is defective by turning the unit OFF then back O
N
while monitoring each voltage on an
oscilloscope. Check the value of each voltage immediately before stopping power supply.
Note:
Each time before turning the unit O
N
, make sure that each power-supply IC is not short-circuited to G
N
D.
Circuit diagram of the voltage monitoring section
Table: List of voltage values for power monitoring and statuses of the voltage comparator transistors
V
+ 1 2 D
V
+ 5 D
R1034
12k
R1035
9.1k
R T 1
N
2 4 1 M
Q 1 0 0 1
2SA1576A(RS)
Q1002
R 1 0 3 6
1 k
R 1 0 3 7
1 0 k
G
N
D D
D1009
1SS355
G
N
D D
D1010
1SS355
R 1 0 4 0
1 k
2SA1576A(RS)
Q1003
R1038
5.6k
R 1 0 4 1
1 0 k
R1039
10k
G
N
D D
V
+ 1 2 D
R1042
8.2k
R1043
3.3k
2SA1576A(RS)
Q1004
V
+ 1 R 2 D
V
+ 3 R 3 D
V
+ 5 D
V
+ 3 R 3 D
R 1 0 4 4
1 0 k
R1045
470
G
N
D D
D1011
UDZS3R3(B)
C1076
0.1u
C1077
0.1u
C1078
0.1u
G
N
D D
C1079
0.1u
G
N
D D
G
N
D D
G
N
D D
V
D E T
1 : 6 G
R T 1 P 2 4 1 M - 1 1
Q 1 0 0 5
R T 1
N
2 4 1 M
Q 1 0 0 6
G
N
D D
R1046
470
V
A D E T
3 E
G
N
D D
V
+ 1 2 D
R1088
N
M
G
N
D D
V
+ 1 R 2 D
V
+ 3 R 3 D
V
+ 5 D
V
+ 1 2 D
1 . 0 8
V
1 . 3 2
V
2 . 8
V
3 . 8
V
4 . 2
V
5 . 7 7
V
1 0 . 2
V
1 3 . 2
V
L o w v a l u e
H i v a l u e
1 . 0 8
V
1 . 3 2
V
N
O R M A L
A B
N
O R M A L
< 1 . 0 8
V
> 1 . 3 2
V
STBY
I
1/6
I
6/6
MAIN ASSY
D5609
1SS355
G
N
DA
G
N
DD
RT1
N
241M
Q5616
RT1P241M-11
Q5617
2 S A 1 5 7 6 A ( R S )
Q 5 6 1 5
2 S A 1 5 7 6 A ( R S )
Q 5 6 1 4
R5784
10k
R 5 7 8 2
1 k
R5781
20k
R5780
20k
R5779
10k
R 5 7 7 8
1 0 k
R5777
10k
R5776
10k
V
+ 1 2 D
V
A D E T
R 5 7 9 1
0
V
+ 1 5 A
V
- 1 5 A
V
+ 5 A
1 4 . 1
V
1 5 . 9
V
1 3 . 2
V
- 1 6 . 8
V
4 . 4
V
5 . 6
V
L o w
V
a l u e
H i
V
a l u e
J
1/2
HAMP ASSY
State
Power
Voltage
Statuses of voltage comparator transistors
VDET
Voltage
Q1002
Q1003
Q1004
Q1006
Q1005
Q5614
Q5615
Q5616
Q5617
Q1001
In normal operation
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Mid
When an error
is generated
V
+12D
< 10.2
V
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
Hi
> 13.2
V
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
Hi
V
+5D
< 4.2
V
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
Hi
> 5.77
V
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
HI
V
+3R3D
< 2.8
V
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
HI
> 3.8
V
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
HI
V
+1R2D
< 1.08
V
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
< 1.08
V
> 1.32
V
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
> 1.32
V
V
+15A
V
+15A
V
-15A
V
+5A
V
-15A
V
+5A
to microcomputer A
< 14.1
V
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
ON
Low
> 15.9
V
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Low
V
-15A
< -16.8
V
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
ON
Low
> -13.2
V
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Low
V
+5A
< 4.4
V
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Low
> 5.6
V
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
ON
Low
Summary of Contents for DJM-2000
Page 8: ...8 DJM 2000 1 2 3 4 A B C D E F 1 2 3 4 2 2 PANEL FACILITIES Control Panel ...
Page 9: ...9 DJM 2000 5 6 7 8 5 6 7 8 A B C D E F Rear Panel ...
Page 13: ...13 DJM 2000 5 6 7 8 5 6 7 8 A B C D E F ...
Page 18: ...18 DJM 2000 1 2 3 4 A B C D E F 1 2 3 4 4 3 DSP BLOCK DIAGRAM ...
Page 19: ...19 DJM 2000 5 6 7 8 5 6 7 8 A B C D E F ...
Page 170: ...170 DJM 2000 1 2 3 4 A B C D E F 1 2 3 4 ...
Page 196: ...196 DJM 2000 1 2 3 4 A B C D E F 1 2 3 4 M M AOUT ASSY SIDE B DER A CN5002 ...