Pioneer DDJ-RB Service Manual page 15

5
[4] USB connection
[4-1] The unit cannot be recognized by the PC when connected to the PC via USB connection.
No. Cause Diagnostics Point
0 Wrong input setting Input setting of the
of the application application installed
installed on the PC on the PC
1 Failure in startup MAIN Assy
2 Defective UCOM MAIN Assy
[5] AUDIO OUT
[5-1] MASTER OUT is not output.
No. Cause Diagnostics Point
0 Wrong input setting Input setting of the
of the application application installed
installed on the PC on the PC
1 ——— MAIN Assy
2 Mute signal MAIN Assy
Loose connection
/defective parts
3 Mute signal MAIN Assy
Loose connection
/defective parts
4 Loose connection MAIN Assy
/defective parts
5 Mute signal MAIN Assy
Loose connection
/defective parts
5
6
Item to be Checked
Check that the input setting of the
application installed on the PC is
appropriate.
Check the lighting statuses of the LEDs
during startup.
Check the communication waveforms of
the USB_DP/DN lines.
Item to be Checked
Check that the input setting of the
application installed on the PC is
appropriate.
Check that an audio signal is output from
DAC (IC703 pin 10, 11) for MASTER OUT.
Check the level of the MUTE audio
muting signal.
Check the level of the A_MUTE audio
muting signal.
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
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).
DDJ-RB
6
7
Corrective Action
The PC will not recognize the unit if the input
setting of the application installed on the PC is
inappropriate.
If no LED lights, see [1] Failure in Startup.
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".
Corrective Action
The PC will not recognize the unit if the input
setting of the application installed on the PC is
inappropriate.
If MASTER connector outputs, go to [2], [3].
If MASTER connector does not output,
go to [4].
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.
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.
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.
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.
7
8
A
Reference
Operating instructions
[1] Failure in Startup
[1-2] Failure in the
microcomputer
system
B
10.13 WAVEFORMS
ij
Reference
Operating instructions
C
10.13 WAVEFORMS
twx
———
D
———
10.13 WAVEFORMS
tuvwx
E
10.13 WAVEFORMS
yz
F
15
8