Pioneer DDJ-T1, Руководство по обслуживанию

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25
DDJ-T1
5 6 7 8
5 6 7 8
A
B
C
D
E
F
[2] Display (LED indicators)
[2-1] Any one of the LEDs does not light.
[3] Operations (Buttons/VRs/Sliders/NeedleSearch/JOG)
[3-1] The push buttons are disabled.
5
Power failure in
the USB_UCOM
UCOM Assy
Check if a voltage error was detected.
Check the power terminal of the
USB_UCOM (IC202).
If the detected voltage error is confirmed, check conduction
between the power supply and G
N D.
Check the power line and the parts, such as coils (beads),
resistors, and capacitors.
If no problem was found with the parts, power line, and
conduction between the power supply and G
N D, the USB_
UCOM (IC202) may be defective.
Abnormal
V oltage Detection
6
USB_UCOM
Reset circuit
error
UCOM Assy
Check the Reset terminal (Pin 10) of the
USB_UCOM (IC202). (High/Low)
In normal operation, the voltage of the Reset terminal
(Pin 10) is high.
If the voltage level at the Reset terminal is low, check for
abnormal voltage detection, and check the power line,
resistors, and capacitors. If no problem was found with the
above circuit, parts, and power line, and if the voltage level
is low, the USB_UCOM (IC202) or the MAI
N _UCOM
(IC701) may be defective.
Abnormal
V oltage Detection
7
USB_UCOM
X'tal error
UCOM Assy
Check the oscillation waveforms of the
X'tal (X201).
If an error is found, check the power line, resistors, and
capacitors.
If the waveform remains abnormal after the X'tal (X201) is
replaced, the USB_UCOM (IC202) may be defective.
8
USB_UCOM
I2C communica-
tion error
UCOM Assy
Check the I2C communication waveforms of the
EEPROM (IC201) immediately after startup.
Data of the EEPROM (IC201) are loaded only during
startup.
If an error is generated, check the power supply to the
EEPROM, resistors, capacitors, and SW IC (IC203) on the
communication line.
If no problem is found with the power supply, communica-
tion line, and parts, the EEPROM (IC201) or USB_UCOM
(IC202) may be defective.
9 EEPROM error UCOM Assy Reload the program via USB.
If no problem is found with the communication waveform in
[8] above, reload the program via USB.
If reloading is successfully performed, the USB_UCOM
(IC202) may be defective.
If reloading fails, the EEPROM (IC201) may be defective.
1 Defective LED LERelated point
Check the connections of the LED then
check the forward voltage (approx. 2.2
V )
between both ends of the LED.
If the forward voltage is abnormal, the LED may be
defective.
LED waveform
10.SCHEMATIC
DIAGRAM
[2-2] Several LEDs do not light.
1 Signal errors
UCOM Assy
CDJ1B
CDJ2B
DJMB
Check for any loose connections between
the MAI
N _UCOM (IC701) and the LEDs.
Check also that the control signal for the
LEDs is output.
If the control signal is not output, check the
mounting status of the MAI
N _UCOM (IC701).
If it is properly mounted, then the IC701 itself may
be defective.
Basic Operation
Check of the
MAI
N _UCOM
Basic Operation
Check of the
MAI
N _UCOM
2 Defective LEDs Related point
Check the forward voltage (approx. 2.2 V )
between both ends of the LEDs.
If the forward voltage is abnormal, the LEDs may be
defective.
LED waveform
10.SCHEMATIC
DIAGRAM
3
Defective
transistors
Related point Check the transistors. The transistors may be defective.
10.SCHEMATIC
DIAGRAM
Operation of all buttons, variable controls, and the JOG dial can be confirmed in Service mode.
1
Loose connection
or defective
switches
Related point
Check for any loose connections on the
signal line from the switch to GRID_IC
(IC702), KEY_BUFFER (IC1101, 1102),
and main microcomputer (IC701).
If other SWs connected to the same signal line
function properly and if the connections are properly
made, the SW may be defective.
Each Signal
Levels
2
Defective MAI N _
UCOM (IC701)
UCOM Assy
If the symptom persists after the above
corrections. Go to [7-1] Basic Operation Check of the
Microcomputer.
No. Cause/Symptom Point to be checked Item to be checked How to distinguish a defective point and/or corrective action Reference
No. Cause/Symptom Point to be checked Item to be checked How to distinguish a defective point and/or corrective action Reference
No. Cause/Symptom Point to be checked
Item to be checked How to distinguish a defective point and/or corrective action Reference
No. Cause/Symptom Point to be checked Item to be checked How to distinguish a defective point and/or corrective action Reference
10.17 WAVEFORMS
USB UCOM
start up
10.17 WAVEFORMS
USB UCOM
start up
c
10.17 WAVEFORMS
USB UCOM
start up
d
10.17 WAVEFORMS
I2C USB UCOM
EEPROM
8.4 COPYING THE
PROGRAM FOR THE
USB CONTROLLER