25
DDJ-ERGO-V
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.3 VOLTAGE MONITORING
The MAI
N
UCOM of this unit always monitors for power and voltage failure of the unit and will shut the unit off immediately
after an error is detected.
Power supply voltage drop and power supply voltage rise generated by short-circuiting between any power-supply IC and
G
N
D or excess current inside the IFP
W
Assy
Power to be monitored:
V
+5_D,
V
+5_A,
V
+7,
V
-6,
V
+3R3_USB
• Content to be monitored
FAULT_DET signal TP terminal on IFP
W
Assy or IC1002 (MAI
N
UCOM) pin 20 FAULT_DET on CDJ1 Assy.
N
ormal: Approximately 3.3
V
Abnormal:
0
V
• MAIN UCOM Detection terminal and its terminal voltage
1.25 sec after the unit is turned O
N
• Timing of monitoring start
50 msec after an error is detected
• Timing upon judgment as a failure
A power failure is indicated with flashing of the illumination LED of the channel fader for left side deck (deck A or C).
Other LEDs are unlit after an error is generated.
• LED indication when an error is generated
If the unit shuts itself down because of failure, perform diagnosis, disconnect the USB cable, then after about 30 seconds
turn the unit back on again.
• Restoration method
1
Disconnect the USB cable.
2
Remove R337 from the IFP
W
Assy.
N
ote: This step will disable power monitoring.
3
Reconnect the USB cable.
4
As the unit is turned on in a normal way, check each voltage in this state.
Note:
Because power will be forcibly supplied even if any voltage is abnormal, if abnormal voltage continues, the
defective point may produce heat, which may be dangerous. Therefore, during diagnosis, be sure to disconnect
the USB cable several seconds after they are connected so that forcible powering will not continue.
5
If the voltage of any power IC is abnormal, the circuit that uses that power or the power IC itself may be defective.
6
Repair the defective part then check that the power and voltage of the repaired part becomes normal.
7
Return R337 to its original position on the IFP
W
Assy.
Note:
This step will enable power monitoring.
• Diagnostic procedure
