Diagnosis; Troubleshooting - Pioneer DDJ-SR Service Manual

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5. DIAGNOSIS

5.1 TROUBLESHOOTING

[0] Service mode
A
Conduct diagonosis on troubles using Service mode.
[1] Troubles of starting system and
communication
The power is not turned on.
Check power switch turn on.
B
Yes
Confirm if the USB cable is
connected properly.
Yes
No Does the MIDI
command output?
Yes
C
Is VUSB 5 V?
Yes
Does D3.3V become
3.3 V correctly?
Yes
UCOM (IC20) is start-up
abnormality.
D
Does oscillator (X3)
oscillate it? (8 MHz)
Yes
Cannot communicate USB.
Confirm whether a USB cable is
connected properly.
E
Is the communication line
of the USB "H" or "L"?
Yes
Confirm whether there is not the
part on the USB line abnormally.
Object: D11 - 14, L13
Is the abnormality in
the parts mentioned above?
F
Yes
12
1
2
The power is turned on correctly,
there is a problem with the LED
circuit. See "LED does not lit"
No
USB cable is defective.
Replace the USB cable.
No
Power supply IC (IC27) is defective.
Replace the I/O PCB Assy.
No X3 is defective.
Replace the X3.
UCOM (IC20) is defective.
Replace the I/O PCB Assy.
No UCOM (IC16) is defective.
Replace the I/O PCB Assy.
No UCOM (IC16) is defective.
Replace the I/O PCB Assy.
Replace the corresponding part.
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3
[2] Troubles of operation element
and LED
Buttons or slide SW does not work.
Buttons reads it in a matrix.
Is the buttons which does
not work the plural?
Yes
Confirm whether a matrix circuit
is defective.
When you pressed on button,
is the target KEY signal "H"?
Yes
Rotary VR does not work.
When you turn VR,
does the signal from VR
change?
Yes
Confirm analog SW where
a signal is connected to.
No
Confirm input signal A,B,C.
Is the signal H or L?
Yes
When you turn VR,
does the output signal of
IC700, 701 change?
Yes
Rotary selector does not work.
Do not push and rotary
which work?
Rotary
Check on 3 pin, 1 pin of
the rotary selector.
When you turned a rotary
selector, is the signal H?
Yes
DDJ-SR
3
4
Confirm that ON does SW, and
No
both ends do conduction.
When SW does not do conduction,
replace the SW.
No UCOM (IC20) is defective.
Replace the I/O PCB Assy.
Q500 to 505, 700 to 702 are
defective.
Replace the corresponding part.
No VR is defective.
Replace the corresponding part.
UCOM (IC20) is defective.
Replace the I/O PCB Assy.
No Analog SW (IC700, 701) is
defective.
Replace the MIXER PCB Assy.
UCOM (IC20) is defective.
Replace the I/O PCB Assy.
Push
See "Buttons or slide SW does
not work".
No UCOM (IC20) is defective.
Replace the I/O PCB Assy.
Rotary selector is defective.
Replace the rotary selector.
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