14
DDJ-RB
1
2
3
4
A
B
C
D
E
F
1
2
3
4
[3-5] Abnormalities regarding the Jog dial
After the Jog dial Assy is disassembled then reassembled, be sure to check that the load value for the Jog dial is within the
specified range. Refer to the "6.1 SERVICE MODE_
2
-1: Measurement mode of the load of Jog dial".
10
Improper
assembly of the
Jog dial
Resistance to turning the Jog dial is too strong. (The load value for the Jog dial is outside the specified range.
Jog dial Assy
Check that the load value for the Jog dial
is within the specified range, referring to
“Measuring method” in “6.1 SERVICE
MODE_
2
-1: Measurement mode of the
load of Jog dial.”
If the load value is outside the specified range,
perform manual running-in rotations of the Jog
dial.
See "Procedure for applying grease during
reassembly of the jog dial" in "7. DISASSEMBLY."
6.1 SERVICE MODE
7. DISASSEMBLY
3
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
Turning of the Jog dial is not detected.
DCK1 Assy,
DCK2 Assy
Check the JOG_DIAL1_0/1_1 and
JOG_DIAL2_0/2_1 waveforms while the
Jogdial is rotated.
If either waveform is abnormal, the photo
interrupters (PC1201 and PC1202) may be
defective.
10.13 WAVEFORMS
P*+
4
Loose connection
/defective parts
Touching of the jog dial is not detected, or touching is detected although the jog dial is not touched.
DCK1 Assy,
DCK2 Assy
Check the signal level of Pin 4 of
IC1201.
The signal is "H" while the jog dial is not touched
and becomes "L" when it is touched. If it is not,
go to [5].
If it is, go to [8].
10.13 WAVEFORMS
'(
10.13 WAVEFORMS
'(
6
Loose connection
/defective parts
DCK1 Assy,
DCK2 Assy
Check the connection between Plate
(DAH3113) and IC1201.
As the surface of the Plate is coated,
a conduction check must be performed on
the plate surface facing the jog dial
(DNK6638) through their gap.
Possible causes are poor connection between
the aluminum plate of the jog dial and the
KN1201 metal fittings for grounding, or
poor connection or a defective part in the circuits
between the KN1201 and IC1201.
———
7
Loose connection
/defective parts
DCK1 Assy,
DCK2 Assy
Check connections between KN1201
and IC1201.
Poor connection or a defective part in the circuits
between the KN1201 and IC1201.
———
8
Loose connection
/defective parts
DCK1 Assy,
DCK2 Assy
Check connections between IC1201 and
UCOM (IC406).
If the connection is properly made, the UCOM
(IC406) may be defective.
———
5
Loose connection
/defective parts
DCK1 Assy,
DCK2 Assy
Check the signal of Pin 3 of
IC1201 (Test land "Freq").
The signal produces a pulse waveform in the
frequency range of 900 to 1300 kHz while the jog dial
is not touched and a pulse waveform in the frequency
range of 400 to 700 kHz while it is touched.
If so, IC1201 may be defective. If the signal produces
a pulse waveform in the frequency range of 900 to
1300 kHz regardless of the jog dial's being touched
or not, go to [6].
For other abnormalities, go to [7].
2
Defective JOG1/2
photo interrupter
DCK1 Assy,
DCK2 Assy
Check that the phases of the JOG_DIAL1_0/1_1
and JOG_DIAL2_0/2_1 waveforms are identical
to those described in "
2
-2: Photo Interrupter
check mode" in "6.1 SERVICE MODE" when
the jog dial is turned.
10.13 WAVEFORMS
P*+
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
9
Improper
assembly of the
Jog dial
The Jog dial turns too freely. (The load value for the Jog dial is outside the specified range.)
Jog dial Assy
Check that the load value for the Jog dial
is within the specified range, referring to
“Measuring method” in “6.1 SERVICE
MODE_
2
-1: Measurement mode of the
load of Jog dial.”
If the load value is outside the specified range,
detach the jog dial then reapply grease.
See "Procedure for applying grease during
reassembly of the jog dial" in "7. DISASSEMBLY."
6.1 SERVICE MODE
7. DISASSEMBLY
If the waveforms are normal but the phases are
not correct, the photointerrupters (PC1201 and
PC1202) may be mounted improperly.
2
Loose connection
/defective parts
DCK1 Assy,
DCK2 Assy,
MXR Assy
Check the voltage at each signal line
when the corresponding VR is turned or
the corresponding fader/slider is moved.
10.13 WAVEFORMS
YZ!"#$
3
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
If the voltage of the signal line does not change
between 3.3 V and 0 V when the VRs, faders, or
sliders are operated, the corresponding operating
element, signal line, multiplexer (IC711, IC712,
IC713), FFC, connector, resistance, or capacitor
may be defective.
If the voltage of the AD_TEMPO1/2_1 signal line is
not 1.65 V, or if the voltage of the AD_TEMPO1/2_0
signal line does not change between 3.3 V and 0 V
when the tempo slider is moved, the tempo slider,
signal line, multiplexer (IC711, IC712, IC713),
FFC, connector, or capacitor may be in failure.
