15
DDJ-RB
5
6
7
8
5
6
7
8
A
B
C
D
E
F
4
Loose connection
/defective parts
MAIN Assy
Check the digital input signals to DAC
(IC703) for MASTER OUT.
• MCLK: pin 1
• BCLK: pin 2
• DATA: pin 3
• LRCK: pin 4
• XRST: pin 5
If any of those signals is abnormal, connection
of the corresponding signal line may be loose or
the resistor, capacitor or UCOM (IC406)
may be defective.
If all signals are normal, the DAC (IC701) and its
peripheral circuitry do not function properly.
10.13 WAVEFORMS
tuvwx
5
Mute signal
Loose connection
/defective parts
MAIN Assy
Identify the point where the audio signal is
interrupted on the line from pins 10 and 11
of IC703 (DAC for MASTER OUT) to the
jacks (JA702).
The audio signal may be interrupted by a loose
connection of the signal line or by a defective
resistor, capacitor, transistor, OP amps (IC705)
or jacks.
10.13 WAVEFORMS
yz
2
———
Mute signal
Loose connection
/defective parts
MAIN Assy
Check the level of the MUTE audio
muting signal.
Normally, the A_MUTE_DD signal must be low
(Approx. -6 V, muting canceled). When it is high
(Approx. 3.3 V), muting is activated and no sound
is output. The MUTE signal becomes high,
possibly because connection of the
corresponding signal line is loose or the Muting
circuit (Q709) or Muting Drive circuit (Q710, Q711
Q713, etc.) is defective.
3
———
Mute signal
Loose connection
/defective parts
MAIN Assy
Check the level of the A_MUTE audio
muting signal.
Normally, the A_MUTE_DD signal must be low
(Approx. 0 V, muting canceled). When it is high
(Approx. 3.3 V), muting is activated and no
sound is output. The A_MUTE_DD signal becomes
high, possibly because connection of the signal
line is loose or the transistor (Q709) or UCOM
(IC406) is defective.
0
Wrong input setting
of the application
installed on the PC
Input setting of the
application installed
on the PC
Check that the input setting of the
application installed on the PC is
appropriate.
The PC will not recognize the unit if the input
setting of the application installed on the PC is
inappropriate.
Operating instructions
1
———
MAIN Assy
Check that an audio signal is output from
DAC (IC703 pin 10, 11) for MASTER OUT.
If MASTER connector outputs, go to [2], [3].
If MASTER connector does not output,
go to [4].
10.13 WAVEFORMS
twx
0
Wrong input setting
of the application
installed on the PC
Input setting of the
application installed
on the PC
Check that the input setting of the
application installed on the PC is
appropriate.
The PC will not recognize the unit if the input
setting of the application installed on the PC is
inappropriate.
Operating instructions
1
Failure in startup MAIN Assy
Check the lighting statuses of the LEDs
during startup.
If no LED lights, see [1] Failure in Startup.
[1] Failure in Startup
2
Defective UCOM MAIN Assy
Check the communication waveforms of
the USB_DP/DN lines.
If the unit is connected to a PC via the USB cable,
communication will be performed through the USB
DP/DN lines. If communication cannot be
performed, check the USB cable, connectors,
internal cables, resistors, capacitors, and filters.
If nothing is wrong with them, UCOM (IC406) is
defective. Check the items listed in “[1-2] Failure in
the microcomputer system”.
[1-2] Failure in the
microcomputer
system
10.13 WAVEFORMS
ij
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
[5] AUDIO OUT
[5-1] MASTER OUT is not output.
[4] USB connection
[4-1] The unit cannot be recognized by the PC when connected to the PC via USB connection.
