Pioneer CDJ-900 Service Manual page 30

1
A
VINYL SPEED ADJUST not controllable
No. Cause Diagnostics Point
Loose SLDB Assy
1
connection
/DFLB Assy
2 Defective VOL SLDB Assy
Defective PANEL
3 DFLB Assy
CPU (IC8005)
B
[3-4] Abnormalities regarding the JOG dial
After the JOG Assy is disassembled then reassembled, be sure to check that the load value for the JOG dial is within the
specified range.
Turning of the JOG dial is not detected
No. Cause Diagnostics Point
JOGB Assy/
Defective photo
1 JFLB Assy/
interrupter
DFLB Assy
Defective PANEL
2 DFLB Assy
CPU (IC8005)
C
Pressing on the JOG dial cannot be detected.
No. Cause Diagnostics Point
Defective JFLB Assy
1
SHEET SW /DFLB Assy
Defective PANEL
2 DFLB Assy
CPU (IC8005)
Noise is heard when the JOG dial is turned.
No. Cause Diagnostics Point
D
Defective JFLB
1 JOG Assy
Assy or gears
The JOG dial turns too freely. (The load value for the JOG dial is outside the specified range.)
No. Cause Diagnostics Point
Improper adjust-
E
ment or assembly
1 JOG Assy
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.)
No. Cause Diagnostics Point
Improper adjust-
ment of the JOG
1 dial or defective JOG Assy
washer, gear, or
F
cam plate
30
1
2
Item to be Checked
Check if there is loose connection on the
signal line from the PANEL CPU (IC8005)
to the SPEED ADJUST(VR8702).
Check the waveforms of signal lines
(TCH/REL).
If the symptom persists after the above
corrections,
Item to be Checked
Check the waveforms of signal lines
(JOG1/JOG2).
If the symptom persists after the above
corrections,
Item to be Checked
Check the waveform of the signal on the
signal line (JOG_SW) when the JOG dial
is pressed.
If the symptom persists after the above
corrections,
Item to be Checked
Check if the JOG FL of the JFLB Assy
has been shifted upward from the holder.
There may be any scratches on the 3
gears or some foreign object between
the gears.
Item to be Checked
Check that the load value for the JOG dial
is within the specified range, referring to
"Measuring method" in "8.1 JOG Dial
Rotation Load Adjustment."
Item to be Checked
Check that the load value for the JOG dial
is within the specified range, referring to
"Measuring method" in "8.1 JOG Dial
Rotation Load Adjustment."
CDJ-900
2
3
Corrective Action
If the connections of signal line are improper,
resolder it.
If the voltage of the signal line (TCH/REL) does not
change between 3.3 V and 0 V, the VINYL SPEED
ADJUST (VR8702) may be defective. Replace it.
Check a mounting state of PANEL CPU(IC8005).
If the mounting is OK, the port may be damaged.
Replace it.
Corrective Action
If no waveform can be confirmed, the photo
interrupter (PC9501) may be defective. Replace it.
Check a mounting state of PANEL CPU (IC8005).
If the mounting is OK, the port may be damaged.
Replace it.
Corrective Action
If the signal on the signal line (JOG_SW) is not set to
L when the JOG dial is pressed, the SHEET SW
(DSX1078-A) may be defective. Replace it.
Check a mounting state of PANEL CPU(IC8005).
If the mounting is OK, the port may be damaged.
Replace it.
Corrective Action
The JOG FL may interfere with JOG A.
Replace the JFLB Assy.
If there are any scratches, replace the scratched gear
with a new one. If there is any foreign object, remove
it then replace the gears with new ones.
Gears to be replaced: Load gear, Gear A, Gear B
Corrective Action
If it is outside the specified range, adjust the position
of the Adjust Plate to change the load value for the
JOG dial, referring to "How to Adjust" in "8.1 JOG
Dial Rotation Load Adjustment."
During the above adjustment, if the upper-limit adjust-
ment position of the Adjust Plate is reached, oil may
have been spattered on the Adjust Plate.
Replace the washer, gear, and cam plate with new
ones, then reassemble.
Corrective Action
If it is outside the specified range, adjust the position
of the Adjust Plate to change the load value for the
JOG dial, referring to "How to Adjust" in "8.1 JOG
Dial Rotation Load Adjustment."
During the above adjustment, if the lower-limit adjust-
ment position of the Adjust Plate is reached, shavings
from the worn-out washer may have increased the
friction. Replace the washer, gear, and cam plate with
new ones, then reassemble.
3
4
Reference
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Reference
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Reference
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Reference
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Reference
8.1 JOG Dial
Rotation Load
Adjustment.
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Reference
8.1 JOG Dial
Rotation Load
Adjustment.
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4