Pioneer DDJ-T1 Service Manual page 27

5
[3-5] 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 "8.5 JOG DIAL ROTATION LOAD ADJUSTMENT".)
Turning of the JOG dial is not detected.
No. Cause/Symptom Point to be checked
UCOM Assy
CDJ1ssy
Defective JOGB
1
/CDJ2 Assy
photo interrupter
LEDB Assy
JOGB Assy
Defective
2 MAIN_UCOM UCOM Assy
(IC701)
Pressing on the JOG dial cannot be detected.
No. Cause/Symptom Point to be checked
UCOM Assy
Defective
CDJ1 Assy
3 TCHB photo
/CDJ2 Assy
interrupter
TCHB Assy
JOGB Assy
Defective
MAIN_UCOM
4 UCOM Assy
(IC701)
Noise is heard when the JOG dial is turned.
No. Cause/Symptom Point to be checked
Defective gear
5 JOG Assy
Defective JOG
DIAL B
The JOG dial turns too freely. (The load value for the JOG dial is outside the specified range.)
No. Cause/Symptom Point to be checked
Improper
adjustment or
6 JOG Assy
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.
No. Cause/Symptom Point to be checked
Improper
adjustment of
the JOG dial or
7 JOG Assy
defective washer,
gear, or cam plate
5
6
Item to be checked
Check the waveforms on the JOG1_1,
JOG1_2, JOG2_1, and JOG2_2 signal lines.
JOG1_1: CN905-2 pin
JOG1_2: CN905-3 pin
JOG2_1: CN905-24 pin
JOG2_2: CN905-23 pin
If the symptom persists after the above
corrections.
Item to be checked
Check the signal level of the JOG_TCH1/2
(Pins 46/47 of IC701) when the JOG dial is
pressed.
If the symptom persists after the above
corrections.
Item to be checked
There may be any scratches on the gear
or some foreign matter between the gears.
There may be any scratches or some
foreign matter on the JOG DIAL B or the
Roller B Assy.
Item to be checked
Check that the load value for the JOG dial
is within the specified range, referring to
"Measuring method" in "8.5 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 "8.5 JOG Dial
Rotation Load Adjustment."
DDJ-T1
6
7
How to distinguish a defective point and/or corrective action
If any waveform cannot be recognized, connection
of that signal line may be loose or the photo
interrupter (PC3201) may be defective.
Check the mounting status of the MAIN_UCOM
(IC701). If it is properly mounted, then the IC701
itself may be defective.
How to distinguish a defective point and/or corrective action
If the signal level of the JOG_TCH1/2 (Pins 46/47 of
IC701) does not become L when the dial is pressed
and H when the dial is released (not pressed,) loose
connection of the signal line or a defective photo
interrupter (IC3301) may be suspected.
Check the mounting status of the MAIN_UCOM
(IC701) and SW IC (IC702). If they are properly
mounted, then the IC701 or IC702 may be defective.
How to distinguish a defective point and/or corrective action
If there are any scratches, replace the scratched
gear with a new one.
If there is any foreign matter, remove it then replace
the gears with new ones.
Gears to be replaced: Load gear, Encoder gear,
JOG shaft
If there are any scratches, replace the scratched
gear with a new one.
If any foreign matter is attached, remove it.
How to distinguish a defective point and/or 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
"8.5 JOG Dial Rotation Load Adjustment."
During the above adjustment, if the upper-limit
adjustment position of the Adjust Plate is reached,
oil may have been spattered on the Adjust Plate.
Replace the washer, load gear, and cam plate with
new ones, then reassemble.
How to distinguish a defective point and/or 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
"8.5 JOG Dial Rotation Load Adjustment."
During the above adjustment, if the lower-limit
adjustment 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.
7
8
A
Reference
10.17
WAVEFORMS
Basic Operation
B
Check of the
MAIN_UCOM
Reference
Each Signal
Levels
10.17 WAVEFORMS
JOG rotation
operation W
—
C
Reference
—
—
D
Reference
8.5 JOG Dial
Rotation Load
Adjustment.
8.5 JOG Dial
Rotation Load
Adjustment.
E
Reference
8.5 JOG Dial
Rotation Load
Adjustment.
8.5 JOG Dial
Rotation Load
Adjustment.
F
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