18
DDJ-ERGO-V
1
2
3
4
A
B
C
D
E
F
1
2
3
4
[2] Display (LED indicators)
[2-1] Any one of the LEDs does not light.
1
Defective LED,
Defective LED
signal line
Periphery of the
abnormal LED
Check the difference in electrical potentials
between the positive and negative electrodes
of the LED that does not light (normally, it
must be within approx. 2.0–3.6
V
).
If the difference is outside the normal range, the
signal lines at the periphery of the corresponding
LED, resistors, or the LED itself may be defective.
10. SCHEMATIC
DIAGRAM
10.13
W
A
V
EFORMS
$%&'
[2-2] Several LEDs do not light or abnormal light
1
Defective LED
signal line,
Defective
MAI
N
UCOM
CDJ1 Assy
CDJ2 Assy
Check the output signal of MAI
N
UCOM
(IC1002).
If the output signal is abnormal, the MAI
N
UCOM
(IC1002) and LED signal line may be defective.
10. SCHEMATIC
DIAGRAM
10.13
W
A
V
EFORMS
$%&'
2
Defective LED
Periphery of the
abnormal LED
Check the connections of the LED then
check the forward voltage (approx. 2.2
V
)
between both ends of the LED.
If the signal waveform is abnormal, the LED
may be defective.
10. SCHEMATIC
DIAGRAM
10.13
W
A
V
EFORMS
$%&'
3
Defective transistor
for LED drive
CDJ1 Assy
CDJ2 Assy
Check the transistors for LED drive.
If the signal waveform is abnormal, the transistor
may be defective.
10. SCHEMATIC
DIAGRAM
10.13
W
A
V
EFORMS
$%&'
6
USB Controller
Reset circuit
error
IFP
W
Assy
Check the voltage of Reset terminal
(pin 10) of the USB Controller (IC102).
In normal operation, the voltage of the Reset
terminal (pin 10) is high.
If the voltage of the Reset terminal is low, check
the reset line, resistors, capacitors.
If no problem is found, the USB Controller
(IC102) or MAI
N
UCOM (IC1002) may be
defective.
10.13
W
A
V
EFORMS
4
7
USB Controller
X'tal error
IFP
W
Assy
Check the oscillation waveforms of the
X'tal (X101).
In normalcy, oscillate it at 6 MHz. If the oscillation
waveforms are abnormal, check the resistor on
the oscillation-signal line, the capacitor, and X'tal
(X101). If nothing is wrong with these parts, the
USB CO
N
TROLLER (IC102) may be defective.
10.13
W
A
V
EFORMS
5
8
I2C communica-
tion error of
USB Controller
start up
IFP
W
Assy
Check the I2C communication waveforms
of the EEPROM (IC104) immediately after
startup.
Data of the EEPROM (IC104) are loaded only
during startup.
If an error is generated, check the power supply
to the EEPROM, resistors, capacitors.
If no problem is found, the EEPROM (IC104) or
USB Controller (IC102) may be defective.
10.13
W
A
V
EFORMS
67
9
EEPROM error
IFP
W
Assy
Reload the program via USB.
If no problem is found with the communication
waveform in "
8
.2 HO
W
TO PROGRAM COPY
FOR USB CO
N
TROLLER" above, reload the
program via USB.
If reloading is successfully performed, the USB
Controller (IC102) may be defective.
If reloading fails, the EEPROM (IC104) may be
defective.
8
.2 HO
W
TO
PROGRAM COPY FOR
USB CO
N
TROLLER
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
