Pioneer DDJ-SX2 Service Manual page 15

5
[3] Abnormality in audio input/output
Audio is not output from the audio
output.
Yes
Audio input is not output.
5
6
Check that the corresponding wires are properly
connected.
Check that there is no abnormality in the operating
element system.
Is no audio output from any of
the audio output terminals?
No
Are the voltages at the following
power-supply ICs appropriate?
• DA5V
• +15V
• -15V
Yes
Is the MUTE signal -15 V?
Yes
Is the audio waveform output
from the DAC output?
Yes
Is the audio signal interrupted
around the MUTE Tr?
Yes
Check that the corresponding wires are properly
connected.
Check that there is no abnormality in the operating
element system.
No
Are the level indicators lit?
Yes
Is the LINE/CD signal of the channel
whose level indicator is unlit output?
Yes
Which signal is not output,
PHONO or MIC?
PHONO
6
7
No
The power circuitry is in failure.
See "Abnormality in internal power supplies."
The MUTE drive circuitry is in failure.
No
Check the peripheral circuits of Q8. If no problem is
found, replace Q8.
Check for digital input to DAC (IC36). If a signal is
input, DAC is in failure.
No
Replace the DSP PCB Assy.
If a signal is NOT input, DSP (IC29) is in failure.
Replace DSP (IC29).
The audio circuitry is in failure.
No
Check the periphery of the OP amplifier.
If no problem is found, replace the OP amplifier.
The MUTE Tr is in failure.
Replace it.
No
See "Audio is not output from the audio output."
Check that the power-supply ICs are normal. If any
problem is found, see "Abnormality in internal power
supplies."
No
If no problem is found in the power-supply ICs, the
audio circuitry is in failure. Check for a point where
the audio signal is interrupted then replace the part
in failure.
MIC
See "The MIC1/MIC2 input signal is not output."
If the LINE/PHONO switching signal is NOT "L,"
UCOM (IC25) is in failure.
If the LINE/PHONO switching signal is "L," the
connected transistor is in failure.
Replace the part in failure or PCB Assy.
DDJ-SX2
7
8
A
B
C
D
E
F
15
8