Troubleshooting - Pioneer DDJ-RB 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.
For the relationship of each power-supply and signal system, see "4.3 POWER 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
"8.2 UPDATING OF THE FIRMWARE."
Contents
[0] Prior Confirmation
[1] Failure in Startup (Failure in power-on)
[2] Display (LED indicators)
[3] Operations (Buttons / Volumes / Faders / Sliders / Jog dial
[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
circuit diagrams and PCB diagrams.
Be sure to check the failure points, as well as check for failure in their peripheral circuits.
[0] Prior Confirmation
[0-1] Checking in Service Mode
No. Cause Diagnostics Point
1 ——— Service mode
[0-2] Checking Internal Cables
No. Cause Diagnostics Point
1 Disconnection, Cables
breakage, or
loose connection
of internal cables
[1] Failure in Startup (Failure in power-on)
[1-1] Failure in the power system
In a case where the unit is not started after the USB cable is connected and the unit is turned ON (all LED are not lit)
No. Cause Diagnostics Point
1 Failure in the MAIN Assy
power system (1)
2 Failure in USB- MAIN Assy
bus power
3 Power failure in MAIN Assy
the UCOM
4 Power failure in MAIN Assy
the UCOM
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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
Check that the voltage of the direct pin of
USB jack (JA101) is in the range of
4.75–5.25 V.
Check that the V+VBUS voltage is lower
than that of the direct pin of USB jack
(JA101) by approximately 0.1 to 0.2 V.
If V+3R3_SH is abnormal
(2.7 V or less)
If the V+3R3_SH voltage is normal,
check that Q203 (5V FET SW) is
functioning properly.
DDJ-RB
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Corrective Action
After a failure point is identified, see the section
referenced in this manual.
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.
Corrective Action
If the voltage is outside the range of 4.75–5.25 V,
failure in the USB-bus power, USB cable and
USB jack (JA101).
If the voltage is 0 V, the wire for the IC protector
(P101) may be broken.
If the normal voltage of V+3R3_SH is not restored,
IC202 or a part that is connected to V+3R3_SH on
the MAIN Assy may be defective, or connection may be poor.
If the PWR_ON signal is "L," V+5D, V+5_LED will not
be output, because Q203 is not turned ON.
The error-detection circuit may have been activated.
Go to [5].
If the PWR_ON signal is "H," the error-detection
circuit is not activated. Check the voltages of all
power ICs. If they are normal, see "[1-2] Failure in
the microcomputer system."
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8
A
B
C
Reference
6. SERVICE MODE
Reference
4.1 OVERALL
WIRING DIAGRAM
D
Reference
4.3 POWER BLOCK
DIAGRAM
5.3 MONITORING
OF POWER SUPPLY
AND VOLTAGE
4.3 POWER BLOCK
DIAGRAM
E
4.3 POWER BLOCK
DIAGRAM
4.3 POWER BLOCK
DIAGRAM
F
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