Pioneer DDJ-RB Service Manual page 13

5
[3] Operations (Buttons / Volumes / Faders / Sliders / Jog dial)
Operation of all operating elements can be confirmed in Service mode.
[3-1] The performance pads (8 large square pads on each of Decks 1 and 2) do not function.
No. Cause Diagnostics Point
1 Loose connection DCK1 Assy
/defective parts DCK2 Assy
Periphery of the
abnormal button
2 Defective UCOM MAIN Assy
(IC406)
[3-2] The buttons are disabled except performance pads
No. Cause Diagnostics Point
1 Loose connection DCK1 Assy
/defective parts DCK2 Assy
MXR Assy
Periphery of the
abnormal button
2 Defective UCOM MAIN Assy
(IC406)
[3-3] Rotary selector not controllable
No. Cause Diagnostics Point
1 Defective MXR Assy
BROWSE
2 Defective UCOM MAIN Assy
(IC406)
[3-4] Volumes, Faders or sliders not controllable
No. Cause Diagnostics Point
1 Loose connection DCK1 Assy,
/defective parts DCK2 Assy,
MXR Assy
5
6
Item to be Checked
Check that the port logic of the
UCOM (IC406) that is connected
to a performance pad changes when the
pad is operated.
If the symptom persists after the above
corrections.
Item to be Checked
Check that the signal line from the
corresponding switch to the transistor at
the switching-detection section up to the
UCOM (IC406) is all right.
If the symptom persists after the above
corrections.
Item to be Checked
Check that the signal lines
(ENC_BRWS_0/1) are normal during
rotation of the rotary selector.
If the symptom persists after the above
corrections.
Item to be Checked
Check that the signal lines (AD_****)
between the VRs/faders/sliders, multiplexer
(IC711, IC712, IC713) and UCOM (IC406)
are all right.
DDJ-RB
6
7
Corrective Action
When the matrix key is pressed :
Normally, repeat High/Low in grid cycle when
a performance pad is ON, and High (approx.
3.3 V) when it is OFF. If it is not, the performance
pad is defective, or signal line, FFC, or
connector may be in failure.
The UCOM (IC406) may be defective.
Corrective Action
When the matrix key is pressed :
Normally, repeat High/Low in grid cycle when
a performance pad is ON, and High (approx.
3.3 V) when it is OFF. If it is not, the performance
pad is defective, or signal line, FFC, or
connector may be in failure.
When the direct key (FX ON/OFF button, FX
BEAT setup buttons) is pressed :
Normally, the logic is Low (approx. 0 V) when
a performance pad is ON, and High
(approx. 3.3 V) when it is OFF. If it is not, the
performance pad is defective, or signal line,
FFC, or connector may be in failure.
If other switches that are connected to the same
signal line operate normally, the corresponding
switch or the diode on the signal line for the
corresponding switch may be defective. If other
switches do not operate either, a transistor in the
switching-detection section or its peripheral
circuits may be defective.
The UCOM (IC406) may be defective.
Corrective Action
If the signals are not normal, signal line, resistor,
the rotary selector may be defective.
The UCOM (IC406) may be defective.
Corrective Action
If the signals are not normal, signal line, resistor,
capacitor may be defective.
7
8
A
Reference
10.13 WAVEFORMS
SWX
[7] Basic Operation
Check of the UCOM
B
Reference
10.13 WAVEFORMS
SWX
C
[7] Basic Operation
Check of the UCOM
D
Reference
10.13 WAVEFORMS
%&
[7] Basic Operation
Check of the UCOM
E
Reference
10.13 WAVEFORMS
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F
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