Pioneer CDJ-2000NXS2 Service Manual page 45

In addition to "[3] Various displayed information"_"3 Auto device diagnosis" the test port output on the main board can identify
abnormalities of each device when the power of the device is turned on and initialized.
If a failure is detected in the device when the power is on, the alarm port will output the pulse signal as follows:
Detection
MAIN CPU
×
FLASH (for MAIN CPU) If FLASH fails, the boot program will not work.
_
SDRAM (for MAIN CPU)
Peripheral with built-in MAIN CPU
_
IDE (DRIVE)
⎯
USB-A Since it is SH built-in, it is quite unlikely to have an
issue only in a peripheral device.
⎯
SD
Whether any issue occurs all the way to connectors
⎯
LAN
or not may not be detected.
External peripheral
_
USB-B
(USB CONTROLLER)
_
PHY chip (PHY CHIP)
_
AUTH chip (AUTH CHIP)
Device communicated with MAIN CPU
_
PANEL CPU
(PANEL)
_
DSP (DSP)
×
SDRAM (for DSP) If SDRAM is NG, it cannot communicate with MAIN CPU.
_
GUI CPU (GUI)
×
FLASH (for GUI CPU) If FLASH is NG, the boot program itself does not operate.
×
SDRAM (for GUI CPU) If SDRAM fails, it cannot communicate with MAIN CPU.
External peripheral communicated with PANEL CPU
_
CDC
Everything normal
Alarm Port
Remarks Output Pattern
(0.5sHI->0.5sLOW) x 1 time -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 7 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 4 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 3 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 9 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 5 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 2 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 6 times -> 2sLOW ->
the same pattern to be repeated
(0.5sHI->0.5sLOW) x 8 times -> 2sLOW ->
the same pattern to be repeated
After 2sHI, remain in LOW
Service Mode/Auto Device Diagnostic Display
Display Remarks
× ←
×
If SDRAM fails, the service program does
not work.
_
⎯ ←
⎯
⎯
_
_
_
"
Although detection is possible even when
communication fails, precise testing may
not be performed because the service
mode is not available.
_
× ←
"
Although detection is possible even when
communication fails, precise testing may
not be performed because it is unable to
display on the LCD.
× ←
×
←
_
Normal
Error
Display
E-7001
E-7020
E-7021
E-7026
E-7022
E-7010
E-7025