38
DDJ-RZX
1
2
3
4
A
B
C
D
E
F
1
2
3
4
5.3 MONITORING OF POWER SUPPLY AND VOLTAGE
Voltage monitoring
The EUP UCOM (IC7001) always monitors the main power supply voltage by F_DET (FAULT_DET) on this unit.
The F_DET signal is High level (+3.3 V) normally, but it becomes Low level (0 V) in abnormal state, and shut down the power
at once when detecting the defect.
Product behavior when an error is generated
The power monitoring is started when 1300 msec elapsed from the power on.
The unit is confirmed to power defect when F_DET signal stays low level for more than 50 msec.
When the power defect is confirmed, the EUP UCOM makes PWR_ON singnal to Low, and the power output of
V+12/V+12LED/V+12A from POWER SUPPLY Assy is stopped.And the EUP UCOM indicates the power defect by blinking the
UTILITY button LED, and turning off the rest all LEDs.
As V+12/V+12LED/V+12A power output is stopped in power defect, the JOG dial display section and touch disply light is
turned off, and it is unable to operate the all switches and volumes.
When the power is turned OFF by detecting the defect, it is able to recover the power if the diagnosis is made by following
procedure after disconnenting the power cord and the power is turned ON again after getting normal voltage.
Diagnostic procedure
As the resident charge is not discharged sufficiently inside the circuit soon after disconnecting the power cord, please execute
the following diagnose or turn ON the power again after the UTILITY button blinking stops and becomes ligt-out state.
Confirm if the circuit between each power and GND is not short-circuited.
As the power monitoring becomes effect in less than 2 seconds after power ON, confirm if there is no defect in each circuit
before the power monitoring becoming effective.
When it is unable to complete confirmation of all monitoring voltage before the power monitoring becomes effective, make
the confirmation in separate steps.
Detected voltage threshold level
Monitoring voltage
Detection threshold range considered variation
V+1R285D
V+3R3A
Overvoltage/
Reduced voltage
Maximum value
Standard value
Minimum value
V+3R3D
V+5A
V+5R1D
V+3R3EUP
V+3R8D
V+4R2D
+
8.30 V
8.58 V
8.86 V
0.50 V
0.60 V
0.70 V
4.28 V
4.58 V
4.87 V
1.34 V
1.53 V
1.74 V
3.80 V
4.30 V
4.82 V
4.08 V
4.42 V
4.75 V
1.85 V
2.40 V
3.05 V
8.30 V
8.58 V
8.86 V
3.00 V
3.22 V
3.47 V
5.12 V
5.98 V
6.94 V
3.34 V
3.53 V
3.76 V
8.30 V
8.58 V
8.86 V
8.28 V
3.53 V
3.83 V
3.99 V
4.13 V
4.27 V
-5.33 V
-4.11 V
-3.13 V
7.33 V
8.74 V
10.50 V
16.52 V
19.50 V
23.16 V
11.95 V
12.56 V
14.64 V
-9.68 V
-7.71 V
-6.11 V
-20.61 V
-19.07 V
-17.58 V
-
+
-
V+15A
V-15A
+
-
+
-
+
+
-
+
-
V+7R5HP
V-7R5HP
-
V+12D
-
+
+
-
+
-
