13
DDJ-RB
5
6
7
8
5
6
7
8
A
B
C
D
E
F
[3] Operations (Buttons / Volumes / Faders / Sliders / Jog dial)
[3-2] The buttons are disabled except performance pads
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.
[3-3] Rotary selector not controllable
1
Loose connection
/defective parts
DCK1 Assy,
DCK2 Assy,
MXR Assy
Check that the signal lines (AD_****)
between the VRs/faders/sliders, multiplexer
(IC711, IC712, IC713) and UCOM (IC406)
are all right.
10.13 WAVEFORMS
YZ!"#$
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
1
Loose connection
/defective parts
DCK1 Assy
DCK2 Assy
MXR Assy
Periphery of the
abnormal button
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.
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.
10.13 WAVEFORMS
SWX
2
Defective UCOM
(IC406)
MAIN Assy
If the symptom persists after the above
corrections.
The UCOM (IC406) may be defective.
[7] Basic Operation
Check of the UCOM
2
Defective UCOM
(IC406)
MAIN Assy
If the symptom persists after the above
corrections.
The UCOM (IC406) may be defective.
[7] Basic Operation
Check of the UCOM
1
Loose connection
/defective parts
DCK1 Assy
DCK2 Assy
Periphery of the
abnormal button
Check that the port logic of the
UCOM (IC406) that is connected
to a performance pad changes when the
pad is operated.
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.
10.13 WAVEFORMS
SWX
2
Defective UCOM
(IC406)
MAIN Assy
If the symptom persists after the above
corrections.
The UCOM (IC406) may be defective.
[7] Basic Operation
Check of the UCOM
1
Defective
BROWSE
MXR Assy
Check that the signal lines
(ENC_BRWS_0/1) are normal during
rotation of the rotary selector.
If the signals are not normal, signal line, resistor,
the rotary selector may be defective.
10.13 WAVEFORMS
%&
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
[3-4] Volumes, Faders or sliders not controllable
If the signals are not normal, signal line, resistor,
capacitor may be defective.
