1 Prior
Confirmation
Perform a device test while connected to
PC and confirm the display of LAN,
MACAd, IPAdd, and Subn.
! If there is no problem, go to step 2.
! If not, the data stored in IC1502 may be
damaged. Replace MAIN Assy.
! If LAN NG, go to step 4.
2 RST defect of
LAN PHY
(IC903
)
MAIN Assy
TP LAN_xRST
Check the following voltages at the
diagnostics point.
[RESET signal]
LAN_XRST (3.3 V)
! If the voltage is confirmed correctly, go to
step 3.
! If not, the circuit may be defective. Check for
the status of soldering and replace.
[7] LAN
[7-1] No LAN communication
Step Cause Diagnostics Point Item to be Checked Corrective Action Reference
—
5 Parts defect
of the pulse
transformer
(T901, T902)
MAIN Assy
T901 4 pin, 5 pin
T902 4 pin, 5 pin
[Confirmation of the communication signal]
Confirm the signal (except for fixed of High
or Low) at the diagnostics circuit
!
If the signal can be confirmed, replace MAIN Assy.
! If not, the signal circuit may be defective.
Check for the status of soldering.
—
—
3
Input clock defect to
USB/ETHER UCOM
(IC401) and
LAN PHY (IC903)
MAIN Assy
R901 (RMII_CLK)
R903 (50M_PHY_CLK)
Check the following voltages at the
diagnostics point.
[CLK signal]
RMII_CLK (3.3 V 50 MHz)
50M_PHY_CLK (3.3 V 50 MHz)
! If the voltage of the all points are confirmed
correctly, go to step 4.
! If not, RMII_CLK signal circuit may be defective.
Check for the status of soldering between X901
and IC401, and between X901 and IC903, and
replace its.
—
4
The communication
error between
USB/ETHER UCOM
(IC401) and
LAN PHY (IC903)
MAIN Assy
IC903 7 pin (RMII_RXD1)
IC903 8 pin (RMII_RXD0)
IC903 17 pin (RMII_TXD0)
IC903 18 pin (RMII_TXD1)
[Confirmation of the communication signal]
Confirm the signal (except for fixed of High
or Low) at the diagnostics circuit
!
If the signal can be confirmed, go to step 5.
! If not, the signal circuit may be defective.
Check for the status of soldering.
—
6.1 TEST MODE—
—
1 You forget to
perform the
calibration
After replacing MAIN Assy, confirm that
each LED is not flashing at startup.
Perform the calibration.
2 Cannot perform
the calibration
LED
[CUE A CH1] [CUE A CH2]
[CUE A CH3] [CUE A CH4]
[CUE A CH5] [CUE A CH6]
Perform the calibration in test mode,
and confirm to become the normal state.
If the calibration cannot perform or the result is
NG, go to [8-2].
[8] Crossfader
[8-1] Abnormal function of the crossfader
Step Cause Diagnostics Point Item to be Checked Corrective Action Reference
7-1-5
7-1-4
7-1-3
7-1-2
8-3-1
8-3-2
8-3-3
8-3-4
CROSS_FADER signal is input to PNL2 UCOM (IC8409).
6.2 CROSSFADER
CALIBRATION
6.2 CROSSFADER
CALIBRATION
1
Wire Connection
defect/
Signal abnormality
! Confirm that the wire between CRFB Assy
and BFXB Assy insert firmly.
! Confirm that the power supply is at 5.0 V.
! If the voltage is confirmed correctly, go to step 2.
! If not, the soldering of IC7601 may be defective.
Repair the defective soldering.
2
Wire Connection
defect/
Signal abnormality
BFXB Assy
V+5CRFD
CN7604 1 pin
—
3
Wire Connection
defect/
Signal abnormality
!
Confirm the wire between BFXB Assy and
UCOM Assy
! Confirm the voltage of the CROSS_FADER circuit.
!
Confirm the CROSS_FADER signal at the
diagnostic point during operating the
Crossfader.
!
If the CROSS_FADER signal voltage does not
change, the resistor or
PNL2 UCOM (IC8409)
may be defective.
Repair the defective soldering.
UCOM Assy
R8595
R8591
R8596
R8592
CRFB Assy
CN8301
1 pin (V+5CRFD)
6 pin (GND_REF2)
2 - 5 pin (AD_CRFD*)
[Power]
! (V+5CRFD)
Confirm that the power supply is at 5.0 V.
! (GND_REF2)
Confirm that GND_REF2 is connected to
GND_REF2 of BFXB Assy.
! (AD_CRFD*)
Confirm the CROSS_FADER signal at the
diagnostic point during operating the
Crossfader.
!
If there is no problem with these items, go to step 3.
! (V+5CRFD)
If the voltage is not confirmed correctly, the circuit
between IC8301 and IC8306 may be defective.
Repair the defective soldering.
! (GND_REF2)
If the CROSS_FADER signal voltage does not
change, the circuit between IC8301 and IC8306
may be defective.
Repair the defective soldering.
[8-2] No work of the crossfader
Step Cause Diagnostics Point Item to be Checked Corrective Action Reference
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