Simplified Diagnostic Procedure For Audio Signal - Pioneer XDJ-RX Service Manual

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5.3 SIMPLIFIED DIAGNOSTIC PROCEDURE FOR AUDIO SIGNAL

A With the NOISE effect function provided with this unit, white noise generated by the main CPU is filtered then mixed with the
audio signal of the assigned channel before being output.
With this function, simplified diagnostics for the audio signal blocks are possible.
Check the following:
· White noise is audible when the NOISE effect button is set to ON or OFF.
· White noise changes in response to changes in the cutoff frequency, volume, or sound quality of the NOISE effects.
If both phenomena can be confirmed, the block prior to the main CPU can be deemed being in failure.
If either phenomenon or neither phenomena can be confirmed, the main CPU, its periphery, or blocks subsequent to the
main CPU can be deemed being in failure.
The operating procedure for the NOISE effect is indicated below.
B
1 Press the [SOUND COLOR FX NOISE] button. (The NOISE effect is set for both CH1 and CH2.)
2 Adjust the volume with the [TRIM] control of the channel you wish to check, the sound quality with the
[EQ/ISO (HI, MID, LOW)] controls, or the cutoff frequency for the filter through which white noise is to be filtered with the
[COLOR] control.
(For details, refer to "Using the sound color FX function" in the operating instructions.)
This diagnostic method is applicable to other DJ products equipped with the NOISE effect generator.
C
B JACK1 ASSY
C JACK2 ASSY
D
F USB1 ASSY
G USB2 ASSY
E
Possible defective locations when both phenomena
can be confirmed
F
30
1
2
A MAIN ASSY
ADC
ADC
ADC
MAIN CPU
USB
HUB
Ether
PHY
Possible defective locations when either phenomenon or neither
phenomena can be confirmed
XDJ-RX
2
3
C JACK2 ASSY
MASTER
DAC
BOOTH
DAC
D HPJB ASSY
HP
DAC
3
4
4