Pioneer CDJ-850 Service Manual page 26

1
A
[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. (Refer to the "8.4 JOG DIAL ROTATION LOAD ADJUSTMENT".)
Turning of the JOG dial is not detected
No. Cause Diagnostics Point
DFLB Assy
Defective part of
1
JFLB Assy
photo interrupter
JOGB Assy
Defective PANEL
2 DFLB Assy
CPU (IC1007)
Pressing on the JOG dial cannot be detected.
B
No. Cause Diagnostics Point
DFLB Assy
1
Defective part
JFLB Assy
Defective PANEL
2 DFLB Assy
CPU (IC1007)
Noise is heard when the JOG dial is turned.
No. Cause Diagnostics Point
Defective
C
attachment of
JFLB Assy
the JOG FL.
1
JOGB Assy
Defective gear
or JOG DIAL B.
The JOG dial turns too freely. (The load value for the JOG dial is outside the specified range.)
No. Cause Diagnostics Point
Improper adjust-
ment or assembly
1 JOG Assy
of the JOG dial
D
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
cam plate
E
F
26
1
2
Item to be Checked
Check the waveforms of signal lines.
JOG1_C (IC1007-pin 26)
JOG2_C (IC1007-pin 25)
If the symptom persists after the above
corrections,
Item to be Checked
Check the level of JOG_SW signal (IC1007
-pin 27) 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.
Also check the JOGB Assy is attached normally.
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 "8.4 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 "8.4 JOG Dial
Rotation Load Adjustment."
CDJ-850
2
3
Corrective Action
If no waveform can be confirmed, the photo
interrupter (PC1901) may be defective.
Check a mounting state of PANEL CPU (IC1007).
If the mounting is OK, the IC1007 may be defective.
Corrective Action
If the JOG_SW signal (IC1007-pin 27) is not set to
"L" when the JOG dial is pressed and it is not set to
"H" when the JOG dial is not pressed, the SHEET
SW(DSX1078) may be defective.
Check a mounting state of PANEL CPU (IC1007).
If the mounting is OK, the IC1007 may be defective.
Corrective Action
The JOG FL may interfere with JOG A.
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 "Load adjustment method" in
"8.4 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 Cam Plate.
Replace the washer, load 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 "Load adjustment method" in
"8.4 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, load gear, and cam plate
with new ones, then reassemble.
3
4
Reference
10.14
WAVEFORMS
5 6
[10] Basic operation
check of CPU/DSP
Reference
10.15 EACH
SIGNAL LEVEL
F
—
Reference
—
—
Reference
8.4 JOG Dial
Rotation Load
Adjustment.
8.4 JOG Dial
Rotation Load
Adjustment.
Reference
8.4 JOG Dial
Rotation Load
Adjustment.
8.4 JOG Dial
Rotation Load
Adjustment.
4