Pioneer DDJ-RB Service Manual page 12
Dj controller
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Also See for DDJ-RB:
- Operating instructions manual (22 pages) ,
- Operating instructions manual (88 pages)
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1
A
No.
Cause
Diagnostics Point
5
Power failure in
MAIN Assy
the UCOM
6
Power failure (2)
MAIN Assy
Identification of
defective power
system
B
[1-2] Failure in the microcomputer system
No.
Cause
Diagnostics Point
1
Power failure in
MAIN Assy
the UCOM
2
UCOM
MAIN Assy
C
Reset circuit
error
3
UCOM
MAIN Assy
X'tal error
4
UCOM
MAIN Assy
startup error
D
[2] Display (LED indicators)
[2-1] Any one of the LEDs does not light.
No.
Cause
Diagnostics Point
1
Defective LED,
Periphery of the
Defective LED
abnormal LED
signal line
E
[2-2] Several LEDs do not light or abnormal light
No.
Cause
Diagnostics Point
1
Defective LED
MAIN Assy
signal line,
Defective
UCOM
2
Defective LED
Periphery of the
abnormal LED
3
Defective transistor
DCK1 Assy,
for LED drive
DCK2 Assy,
MXR Assy
F
12
1
2
Item to be Checked
Check if the error-detection circuit has
been activated.
Deactivate the voltage monitoring circuit
then check the section with improper
voltage.
Item to be Checked
Check the power terminal of the
UCOM (IC406).
Check the Reset terminal (pin 46) of the
UCOM (IC406).
Check the oscillation waveforms of the
X'tal (X404).
After startup, check the lighting statuses of
the LEDs.
(For example, although some of the LEDs
light properly, the unit is not started up
properly.)
Item to be Checked
Check the difference in electrical potentials
between the positive and negative
electrodes of the LED that does not light
(normally, it must be within approx. 3.2 V:
blue, 2.2 V: others).
Item to be Checked
Check the output signal of UCOM (IC406). If the output signal is abnormal, the UCOM
Check the connections of the LED then
check the forward voltage (approx. 3.2 V:
blue, 2.2 V: others) between both ends of
the LED.
Check the transistors for LED drive.
DDJ-RB
2
3
Corrective Action
If the FAULT_DET signal is "L," the error-detection
circuit has been activated. Go to [6].
If the FAULT_DET signal is "H," the error-detection
circuit is not activated. Check the voltages of all power
ICs. If they are normal, see "[1-2] Failure in the
microcomputer system."
The voltage monitoring circuit can be deactivated by
removing R267 (0 ) on the FAULT_DET.
See the notes in "5.3 MONITORING
OF POWER SUPPLY AND VOLTAGE"
before proceeding to further diagnostics.
To identify the section with improper voltage, check
the voltage at each point on the MAIN Assy.
Corrective Action
Check the power and voltage are normal.
Check the power line and the parts, such as coils
(beads), resistors, and capacitors.
If no problem was found with the parts, power line,
and conduction between the power supply and
GND, the UCOM (IC406) may be defective.
In normal operation the voltage of the Reset
terminal (Pin 46) is high. If it is low, check if the
voltage at V+3R3_SH or V+3R3_SHD is 2.7 V
or less. Check the reset line, resistors,
capacitors, and the Reset IC (IC1001).
If the oscillation waveforms are abnormal, check the
resistor on the oscillation-signal line, the capacitor,
and X'tal (X404). If nothing is wrong with these
parts, the UCOM (IC406) may be defective.
Reload the program via USB
(8.2 UPDATING OF THE FIRMWARE).
If the normal status is not recovered after
all above steps are performed,
the UCOM (IC406) may be defective.
Corrective Action
If the difference is outside the normal range, the
signal lines at the periphery of the corresponding
LED, resistors, or the LED itself may be defective.
Corrective Action
(IC406) and LED signal line may be defective.
If the signal waveform is abnormal, the LED
may be defective.
If the signal waveform is abnormal, the transistor
may be defective.
3
4
Reference
4.3 POWER BLOCK
DIAGRAM
4.3 POWER BLOCK
DIAGRAM
5.3 MONITORING
OF POWER SUPPLY
AND VOLTAGE
Reference
10.13 WAVEFORMS
PQR
10.13 WAVEFORMS
PQR
10.13 WAVEFORMS
PQR
8.2 UPDATING OF
THE FIRMWARE
Reference
10.13 WAVEFORMS
S,./
Reference
10.13 WAVEFORMS
S,./
10.13 WAVEFORMS
S,./
10.13 WAVEFORMS
S,./
4
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