Pioneer XDJ-RX Service Manual page 26

1
A
The slide VRs are inoperable.
TEMPO SLIDER, CH FADER,
CROSS FADER
There is no response to pressing the JOG
dial. The sensitivity when the JOG dial is
pressed is low.
B
C
D
The LEDs do not light.
E
F
26
1
2
Check if normal waveforms are input to the microcomputers.
If there is no problem, replace the microcomputer or analog SW IC to
which an inoperable slide VR is connected:
• Microcomputers (CH FADER, CROSS FADER)
Replace IC3601 in the MIXB Assy.
• Analog SW IC (TEMPO SLIDER)
Replace IC4001 in the CDJB Assy.
Check that the voltage at Pin 12
of CN9601/CN9801 changes from
0 V to 3.3 V when
the JOG dial is pressed.
No
Check the signal output from Pin 4 of IC9601
/IC9801 in the JOGT1/JOGT2 Assy,
referring to "10.46 WAVEFORMS d: Signal
whenthe JOG dial is pressed."
Is the corresponding waveform
output?
No
No LEDs connected to the
same grid light.
No
No LEDs light.
No
XDJ-RX
2
3
See "No operation with keys (switches), No
Yes
operation with slide switches, No response
to pressing the rotary selector."
Check the line connected to Pin 4.
Check the resistance and variable resistors of the
circuit for detection of pressing of the JOG dial. As
the resistors are configured in parallel, the
resistance is approx. 375 ohms in the mounted
status. If the sensitivity of pressing the JOG dial is
low, the resistance value may have been probably
changed. If there is no response to pressing of the
JOG dial, the variable resistors have probably been
Yes
damaged. Replace them. (Replacement is required
because whether or not the variable resistors are
damaged can be judged neither from the
appearance nor by electrical measurement.)
• JOGT1 Assy: R9601, R9613, VA9601, VA9604
• JOGT2 Assy: R9801, R9813, VA9801, VA9804
If the problem is not resolved with the above
corrections, the microcomputers for detection of
pressing the JOG dial may be in failure. Replace
the JOGT1 and JOGT2 Assemblies.
Check the line connected to Pin 4. As the
microcomputer for detecting pressing of
the JOG dial may be in failure, replace
the JOGT1 and JOGT2 Assemblies.
Check the corresponding grid, referring to
Grid control" in "10.46 WAVEFORMS."
If the grid waveform signal output from the shift
register IC is abnormal, check if the grid line is
short-circuited with GND, caused by a failure in
a key, LED, or the transistor for the drive (or cables
connecting between the LED and the transistor).
Yes
Also check the connection of the grid line.
If there is no problem, replace the shift register IC:
• If the LEDs in the MIXER block do not light
Replace IC3001 in the MIXB Assy.
• If the LEDs in the CDJ block do not light
Replace IC4002 in the CDJB Assy.
• If the level meter LEDs do not light
Replace IC3501 in the LLED Assy.
Check the waveform and connection of the
line that is connected to the microcomputer,
and also check the transistor that is placed
Yes
between the microcomputer port and the LED.
If no problem is
found, then replace the microcomputer
(IC3601) in the MIXB Assy.
Check the LED that does not light. If it is OK,
check the peripheral circuit.
(The microcomputer is normal, because
some other LEDs that are connected to the
same port light properly.)
3
4
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