Instruction Manual
6.1 TEST MODE
0 Prior
Confirmation
! A, B, DIGITAL, LINE,
PHONO, MULTI I/O,
BUILT-IN, EXT1,
EXT2/TRIM
!
CH Level Indicator
! Confirm in test mode that the operation is
enabled.
! Confirm that the selector is set properly.
! Confirm if the Channel Level Indicator
lights on when an audio signal is input.
! If the Channel Level Indicator lights on,
OUTPUT may be defective. Refer to
"[4] AUDIO OUTPUT".
! If not, go to step 1.
1 Parts defect AIN Assy
L*OUT_L/R,
P*OUT_L/R
Representative CH1
[Confirmation of the analog input before
the Differential Conversion Circuit]
Confirm the audio signal (sine wave) at the
diagnostics circuit.
! If no audio signal is input, an analog circuit
before this part may be defective.
Check for the status of soldering and replace it.
! If not, go to step 2.
2 Parts defect AIN Assy
CH*OUT_L+/L-/R+/R-
Representative CH1
[Confirmation of the analog input after
the Differential Conversion Circuit]
Confirm the audio signal (sine wave) at the
diagnostics circuit.
! If no audio signal is input, an analog circuit
before this part may be defective.
Check for the status of soldering and replace it.
! If not, go to step 3.
[3] AUDIO INPUT
[3-1] No signal is input to the LINE, PHONO connectors
Step Cause Diagnostics Point Item to be Checked Corrective Action Reference
SPI
communication
error between
PNL1 UCOM
(IC8406) and
PNL2 UCOM
(IC8409)
[2-2-8] MIDI START/STOP (WAKE UP) LED keep flashing at a cycle of about 3 seconds
A communication error between MAIN CPU/DSP and PNL1 UCOM after startup PNL1 UCOM was generated.
5.6 STARTUP
ERROR DISPLAY
—1—— Replace MAIN Assy.
Step Cause Diagnostics Point Item to be Checked Corrective Action Reference
[2-2-9] MIDI ON LED keep flashing at a cycle of about 250 ms
A communication error between PNL1 UCOM and PNL2 UCOM during startup PNL2 UCOM was generated.
5.6 STARTUP
ERROR DISPLAY
—
—
3 Parts defect AIN Assy
CH*_L+/L-/R+/R-
Representative CH1
[Confirmation of the analog input before ADC]
Confirm the audio signal (sine wave) at the
diagnostics circuit.
! If no audio signal is input, an analog circuit
before this part may be defective.
Check for the status of soldering and replace it.
! If not, go to step 4.
—
4 Parts defect
/
Connection defect
AIN Assy
IC4701 (CH1-4 ADC)
IC4801 (CH5-6 ADC)
ADAT_CH*
Representative CH1
[Confirmation of the digital output after ADC]
Confirm the audio signal (except for fixed
of High or Low) at the diagnostics circuit.
! If no audio signal is input, the circuit around
CH*_ADC may be defective. Confirm the following.
- Soldering state of
IC4701, IC4801 and around
circuit (V+5A_IN, V+3R3A_*, xRST_ADC,
MCLK_CH*, BICK_CH*, LRCK_CH*)
-
Connection of 50p FFC between AIN and MAIN Assy
-
Connection of 10p wire between AIN and MAIN Assy
If there are no problems, replace AIN Assy.
! If not, go to step 5.
—
5 Parts defect
/
Connection defect
MAIN Assy
IC1101 (MAIN CPU/DSP)
CH*_ANA_DATA
Representative CH1
[Confirmation of the input to MAIN CPU/DSP]
Confirm the audio signal (except for fixed
of High or Low) at the diagnostics circuit.
! If no audio signal is input, the connection of
50p FFC between AIN and MAIN Assy may be
defective. Or the circuit to IC1101 may be
defective. Check for the status of connection
and soldering, and replace it.
! If not, IC1101 or the circuit around it may be
defective. Replace MAIN Assy.
—
Check the following voltages at the
diagnostics point.
[SPI communication between PNL1 UCOM
and PNL2 UCOM]
PNL1_PNL2_SCK
(3.3 V amplitude)
PNL1_PNL2_RXD
(3.3 V amplitude)
PNL1_PNL2_TXD
(3.3 V amplitude)
PNL1_PNL2_RDY
(3.3 V amplitude)
UPD_PNL1_PNL2
(0 d 3.3 V)
1 ! If the voltage of the all points are confirmed
correctly, replace UCOM Assy.
!
If not,
the diagnosed parts may be defective.
Replace its.
Step Cause Diagnostics Point Item to be Checked Corrective Action Reference
UCOM Assy
R8496 (PNL1_PNL2_SCK)
R8499 (PNL1_PNL2_TXD)
R8605 (PNL1_PNL2_RXD)
R8602 (PNL1_PNL2_RDY)
R8501 (UPD_PNL1_PNL2)
3-1-1
3-1-2
3-1-3
3-1-4
3-1-5
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