Troubleshooting - Pioneer DDJ-T1 Service Manual

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5.2 TROUBLESHOOTING

In this section, causes of failure, diagnostics points, and corrective measures can be searched for according to symptoms.
Before disassembling this unit, it is recommended to infer a failure point by referring to the error code.
For the relationship of each power-supply system, see "4.3 POWER SUPPLY BLOCK DIAGRAM."
If software of the product is updated before performing diagnostics, check that software updating has been performed
properly before proceeding to diagnostics.
If software updating has not been performed properly, update the software, following the instructions in
"8.3 UPDATING OF THE FIRMWARE."
Contents
[0] Prior Confirmation
[1] Failure in Startup (Failure in power-on, all LEDs unlit)
[2] Display (LED indicators)
[3] Operations (Buttons/VRs/Sliders/NeedleSearch/JOG)
[4] USB connection
[5] AUDIO OUT
[6] AUDIO IN
[7] Basic Operation Check of the MAIN_UCOM
The waveform numbers and voltage confirmation-point numbers described in this section correspond to the numbers on the
schematic diagrams and PCBs.
Be sure to check the failure points, as well as checking for failure in their peripheral circuits.
[0] Prior Confirmation
[0-1] Checking in Service Mode
No. Cause/Symptom Point to be checked
1 – Service Mode
[0-2] Checking Internal Cables
No. Cause/Symptom Point to be checked
Disconnection,
breakage, or
1 Cables
loose connection
of internal cables
[1] Failure in Startup (Failure in power-on, all LEDs unlit)
[1-1] Failure in the power system
In a case where the unit does not start up, even after it is turned ON, when it is powered via the AC adapter or USB-bus power connection.
No. Cause/Symptom Point to be checked
Failure in the USBB Assy
1
AC adapter V+ADP5
Failure in USB- USBB Assy
2
bus power V+USB5
Power failure in the
UCOM Assy
3-1 MAIN_UCOM on
MAIN_UCOM
the UCOM Assy
Power failure in the
UCOM Assy
3-2 USB_UCOM on
USB_UCOM
the UCOM Assy
5
6
Item to be checked
Identify a failure point.
Item to be checked
Check that all the cables are securely
connected. Check that there is no breakage
in the cables.
Item to be checked
Set the POWER switch to OFF.
Check that the voltage of the V+ADP5
power line is in the range of 4.75–5.25 V.
Set the POWER switch to OFF.
Check that the voltage of the V+ADP5
power line is in the range of 4.75–5.25 V.
Set the POWER switch to ON.
If V+3R3_UCOM is abnormal (2.7 V or less)
and V+4R7_STB is normal (4.2–5.0 V)
Set the POWER switch to ON.
If V+3R3_USB is abnormal (2.7 V or less)
and the V+5_USB is normal (4.5 V–5.25 V)
DDJ-T1
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7
How to distinguish a defective point and/or corrective action
After a failure point is identified, see the section
referenced in this manual.
How to distinguish a defective point and/or corrective action
Securely connect a cable if it is not connected.
If a cable is broken, replace it.
Note: If an FFC cable is disconnected, be careful of
the orientation of the contacts when reconnecting it,
referring to the printed guide on the board.
How to distinguish a defective point and/or corrective action
If the voltage is outside the range of 4.75–5.25 V,
failure in the AC adapter and its periphery may be
suspected. AC adapter (DWR1491), DC jack
(JA2501), FETs (Q2523, Q2525), Tra ( )
If the voltage is outside the range of 4.75–5.25 V,
failure in the USB-bus power and its periphery may
be suspected. Check the USB cable and USB
connector.
The regulator (IC105), the MAIN_UCOM (IC701),
or their peripheral circuits may be defective.
The regulator (IC102), the USB_UCOM (IC202),
or their peripheral circuits may be defective.
7
8
A
B
C
Reference
6. SERVICE
MODE
Reference
4.1 OVERALL
CONNECTION D
DIAGRAM
Reference
4.3 POWER
SUPPLY BLOCK
DIAGRAM
E
10.17 WAVEFORMS
AC adapter
4
4.3 POWER
SUPPLY BLOCK
DIAGRAM
10.17 WAVEFORMS
Power bus power
1
4.3 POWER
SUPPLY BLOCK
DIAGRAM
4.3 POWER
SUPPLY BLOCK
F
DIAGRAM
23
8