Pioneer DJM-900NXS Service Manual page 37

5
[4] DVS
[4-1] No analog timecode signal input to the mixer
No. Cause Diagnostics Point
DIGITAL, CD/LINE,
Prior
PHONO, LINE, USB
0
Confirmation
*/* selector/PC
settings
MAIN Assy
Loose connection
V+5VBUS
1
/defective parts
/ USBI Assy
INPUT Assy
Loose connection
TC_SEL* 2-32
2
/defective parts
MAIN Assy
INPUT Assy
Loose connection
CH*_ADAT_TIME
3
/defective parts
2-27
INPUT Assy
Loose connection
Representative
4
/defective parts
CH1_TIME_R
2-26
INPUT Assy
Before TRIM/
Loose connection
CH*_TIME_
5
/defective parts
L/CH*_TIME_R
2-26
INPUT Assy
Representative
CH1_RESET
Loose connection
6
:13 pin 2-28
/defective parts
LRCK: 10 pin
MCLK: 11 pin
BCLK: 12 pin
[4-2] No signal is input to and output from the USB 1 to 4 connectors.
No. Cause Diagnostics Point
DIGITAL, CD/LINE,
Prior
PHONO, LINE, USB
0
Confirmation */* selector/PC
settings
MAIN Assy /
Loose connection
1 V+5VBUS
/defective parts
USBI Assy
5
6
Item to be Checked
• Check that the selector is set to USB*/*.
• Check that the DJM-900 nexus utility of the
connected PC is set properly.
• Check that the timecode (control) CD is
connected to the CD connector and the
timecode (control) record is connected to
the PHONO connector.
• Check for the connections of CN1802/CN3801.
• Check that the voltage at Pin 5 (V+5VBUS) of
1-37
CN1802 is about 5 V (4.75 to 5.25) using a PC
connected.
[Checking the Audio Timecode select block]
Check that the TC_SEL* signal level (Pin 6
/
of IC4408/IC4808/IC5208/IC5608) is H.
Check that a signal is input at Pin 2 of
IC4408/IC4808/IC5208/IC5608.
[Checking a Timecode ADC block]
Check that a singal is input to the input
connector of the Timecode ADC.
IC4403(CH1)/IC4803(CH2)/IC5203(CH3)
/IC5603(CH4) 1 pin, 2 pin
[Checking an Timecode Buffer block]
Check for a signal at the periphery of the
Timecode Buffer.
IC4401(CH1)/IC4801(CH2)/IC5201(CH3)
/IC5601(CH4)
[Checking a Timecode ADC block]
Check for signals at IC4403(CH1)/IC4803
(CH2)/IC5203(CH3)/IC5603(CH4).
A signal level at Pin 13 of the RESET_IN*
should be H.
2-31
• LRCK: 10 pin
2-30
• MCLK: 11 pin
2-29
• BCLK: 12 pin
Item to be Checked
• Check that the selector is set to USB*/*.
• Check that the DJM-900 nexus utility of the
connected PC is set properly.
• Check for the connections of CN1802/CN3801.
• Check that the voltage at Pin 5 (V+5VBUS) of
1-37
CN1802 is about 5 V (4.75 to 5.25) using a PC
connected.
DJM-900NXS
6
7
Corrective Action
• Correct any poor connections.
• If the voltage at Pin 5 (V+5VBUS) of CN1802 is
not about 5 V (4.75 to 5.25), replace the USBI
Assy.
• If it is not H, MAIN CUP (IC2011) must be
improperly soldered or defective.
• If it is H, go to [3].
• If no signal is input, go to [4].
• If a signal is input, IC4408/IC4808/IC5208/
IC5608 must be improperly soldered or defective.
If no audio signal is input to the ADC, a problem
in an analog circuit at a previous stage may be
suspected.
• If no signal is input, go to [4].
• If a signal is input, go to [5].
If a signal is interrupted at the periphery of the
Timecode Buffer, this block must be improperly
soldered or defective.
If a signal level at Pin 13 of the RESET_IN* is
not H, go to [9] of [2-1] No signal is input to the
CD/LINE, PHONO connectors.
• LRCK: 10 pin
• MCLK: 11 pin
• BCLK: 12 pin
If no signal is input, go to [11] of [2-1] No signal
is input to CD/LINE, PHONO connectors.
• If both are normal and there is no signal at Pin
9, IC4403(CH1)/IC4803(CH2)/IC5203(CH3)/
IC5603(CH4) must be improperly soldered or
defective.
Corrective Action
• Correct any poor connections.
• If the voltage at Pin 5 (V+5VBUS) of CN1802 is
not about 5 V (4.75 to 5.25), replace the USBI
Assy.
7
8
A
Reference
Operating
instructions
B
10.41 WAVEFORMS
INPUT ASSY
2-32
10.41 WAVEFORMS
INPUT ASSY
2-27
10.41 WAVEFORMS
INPUT ASSY
2-26
C
10.41 WAVEFORMS
INPUT ASSY
2-26
10.41 WAVEFORMS
INPUT ASSY
2-28
2-31
2-30
2-29
D
Reference
Operating
instructions
E
F
37
8