Voltage Monitoring - Pioneer DDJ-ERGO-V Service Manual

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5.3 VOLTAGE MONITORING

The MAIN 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.
• Content to be monitored
Power supply voltage drop and power supply voltage rise generated by short-circuiting between any power-supply IC and
GND or excess current inside the IFPW Assy
Power to be monitored: V+5_D, V+5_A, V+7, V-6, V+3R3_USB
• MAIN UCOM Detection terminal and its terminal voltage
FAULT_DET signal TP terminal on IFPW Assy or IC1002 (MAIN UCOM) pin 20 FAULT_DET on CDJ1 Assy.
Normal: Approximately 3.3 V
Abnormal: 0 V
• Timing of monitoring start
1.25 sec after the unit is turned ON
• Timing upon judgment as a failure
50 msec after an error is detected
• LED indication when an error is generated
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.
• Restoration method
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.
• Diagnostic procedure
1 Disconnect the USB cable.
2 Remove R337 from the IFPW Assy. Note: 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 IFPW Assy.
Note: This step will enable power monitoring.
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DDJ-ERGO-V
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7
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A
B
C
D
E
F
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