Pioneer DJM-900NXS, Service Manual

Page: 28 / 223

2 8
DJM-900NXS
1 2 3 4
A
B
C
D
E
F
1 2 3 4
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
No. Cause Diagnostics Point Item to be Checked Corrective Action Reference
No. Cause Diagnostics Point Item to be Checked Corrective Action Reference
3
DSP (IC701)
does not start.
Devices
• DSP (IC701)
• FLASH (IC703)
• SDRAM (IC702)
MAI N Assy
[POWER]
L702
L701
L703
R782
[RESET]
R671
R674
[CLK]
R896
[POWER]
If an error is detected, check for the power supply
source on the power supply block diagram, and
repair it if it has an error.
[RESET]
If the signal level is not High, check for the signal
supply source of the RESET signal, and repair it if
it has an error.
[CLK]
If no signal is input, check for the signal supply
source of the CLK signal and repair it if it has an
error.
[POWER]
4.3 POWER
BLOCK DIAGRAM
5.3
I
N FORMATIO N O N
POWER
DIAG
N OSTICS
[RESET]
10.41 WA
V EFORMS
MAI N ASSY
[CLK]
10.41 WA
V EFORMS
MAI N ASSY
[1-4] The unit does not turn on, and the LED of the LFO FORM (WAKE UP) flashes five times.
Communication error between MAI N _CPU (IC2011) and SUB_UCOM (IC6601).
1
SUB_UCOM
(IC6601) does
not start.
Devices
• SUB_UCOM
(IC6601)
P N LB Assy
[POWER]
R6615
[RESET]
R6611
[CLK]
X6601
[POWER]
V +3R3D_PA
[RESET]
Check that the signal level of SUB_CPU_
RESET is High.
[CLK]
Check if the 20 MHz clock is input.
As the drive circuit is in an IC, a normal
waveform check cannot be performed.
Simply check whether or not it oscillates.
[POWER]
If an error is detected, check for the power supply
source on the power supply block diagram, and
repair it if it has an error.
[RESET]
If the signal level is not High, check for the signal
supply source of the RESET signal, and repair it if
it has an error.
[CLK]
If no signal is input, check for the signal supply
source of the CLK signal and repair it if it has an
error.
[POWER]
4.3 POWER
BLOCK DIAGRAM
5.3
I
N FORMATIO N O N
POWER
DIAG
N OSTICS
[RESET]
10.41 WA
V EFORMS
P N LB ASSY
[CLK]
10.41 WA
V EFORMS
P N LB ASSY
[1-5] The unit does not turn on, and the LED of the LFO FORM (WAKE UP) flashes six times.
Communication error between MAI N _CPU (IC2011) and USB_UCOM (IC1801).
1
USB_UCOM
(IC1801) does
not start.
Devices
• USB_UCOM
(IC1801)
• SDRAM
(IC1802)
MAI N Assy
[POWER]
L1802
L1801
R1806
R1817
[RESET]
C1831
[CLK]
R2304
[POWER]
V +1R2D_USB
V +3R3D_USB
V +3R3D_USB_MEM
V +2R5D_USB_PLL
[RESET]
Check that the signal level of USB_RESET
is High.
[CLK]
Check if the 24 MHz clock is input to
24M_CLK_USB.
[POWER]
If an error is detected, check for the power supply
source on the power supply block diagram, and
repair it if it has an error.
[RESET]
If the signal level is not High, check for the signal
supply source of the RESET signal, and repair it if
it has an error.
[CLK]
If no signal is input, check for the signal supply
source of the CLK signal and repair it if it has an
error. [POWER]
4.3 POWER
BLOCK DIAGRAM
5.3
I
N FORMATIO N O N
POWER
DIAG
N OSTICS
[RESET]
10.41 WA
V EFORMS
MAI N ASSY
[CLK]
10.41 WA
V EFORMS
MAI N ASSY
[1-6] The unit does not turn on, and the LED of the LFO FORM (WAKE UP) flashes seven times.
Communication error between MAI N _CPU (IC2011) and DIT (IC2405).
1
Power
Signal line
MAI N Assy
[POWER]
R2425
[RESET]
C2411
[CLK]
R2409
[POWER]
Check for the voltage of the
V +3R3D_DIT
power.
[RESET]
Check that the signal level of DIT_RESET
is High.
[CLK]
Check that 24M CLK is input.
[POWER]
If an error is detected, check for the power supply
source on the power supply block diagram, and
repair it if it has an error.
[RESET]
If the signal level is not High, check for the signal
supply source of the RESET signal, and repair it if
it has an error.
[CLK]
If no signal is input, check for the signal supply
source of the CLK signal and repair it if it has an
error. [POWER]
4.3 POWER
BLOCK DIAGRAM
5.3
I
N FORMATIO N O N
POWER
DIAG
N OSTICS
[RESET]
10.41 WA
V EFORMS
MAI N ASSY
[CLK]
10.41 WA
V EFORMS
MAI N ASSY
2 Defective part
MAI N Assy
DIT (IC2405)
If the symptom persists after the above
corrections.
DIT (IC2405) may be defective.
Replace it.
—
[1-7] The unit does not turn on, and the LED flashes endlessly.
The unit is shut down in error by the Power Monitoring Circuit.
1 Power failure
See "5.4 V OLTAGE
MO N ITORI N G CIRCUIT.”
Check for power at each point, following
“5.4
V OLTAGE MO N ITORI N G CIRCUIT.”
Repair the defective parts.
5.4 V OLTAGE MO N I-
TORI N G CIRCUIT
[POWER]
V +3R3D_DSP
V +1R2D_DSP
V +1R2D_DPLL
V +3R3D_DSP_MEM
[RESET]
DSP_RESET
Check that the signal level of DFLASH_RST
is High.
[CLK]
Check if the 24 MHz clock is input to
24.5M_CLK_DSP.
1-55
1-56
1-57
1-58
1-26
1-27
1-26 1-27
1-59
1-59
1-31
1-73
1-69
1-68
1-69
1-68
1-32
1-33
1-34
1-36
1-35
1-36
1-35
4-19
4-17
4-18
4-17
4-18