19
DDJ-RB
5
6
7
8
5
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7
8
A
B
C
D
E
F
5.4 ABOUT POWER-SAVING MODE
This product always monitors voltage drop of the VBUS power (power to be supplied via a USB cable), which may be caused
by connection of a peripheral device that is not covered under warranty or an erroneous operation. If an abnormality is
detected, the product will limit the maximum output level of the headphone so that it can operate in a lower
power-consumption mode.
If an abnormality is generated, check the connected headphones and computer.
Drop in power voltage in the MAIN Assy to be supplied via a USB cable
Power voltages to be monitored: V+VBUS
• Content to be monitored
TP terminal near the R295 of MAIN Assy or IC713 (MUX IC) pin 13 V_DET_AD input terminal.
Normal: Approximately 2.3 V to 2.6 V
Abnormal: < 2.3 V
• Microcomputer Detection terminal and its terminal voltage
500 ms after the unit is turned ON
• Timing of monitoring start
50 msec after an error is detected
• Timing upon judgment as a failure
V+VBUS: 4.2–4.5 V
The maximum output level of the headphone is suppressed to approximately 15%.
If normal power voltage is recovered, the suppressed maximum output level of the headphone will return to its original level.
• Headphone level when an error is generated
1
Check if headphones with impedance outside the range of the guaranteed specifications (impedance 32 ohms or less)
are
connected.
2
Check if a monaural plug is connected to the Headphones connector.
3
The connected computer may not be able to supply enough USB power (may not meet USB standards).
• Items to be checked
