Diagnosis; Power On Sequence - Pioneer CDJ-900 Service Manual

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5. DIAGNOSIS

5.1 POWER ON SEQUENCE

A
Power-on Sequence
Main CPU
Power on
Pin Y22 of Main CPU
(IC101) cancels reset at H.
Initialization of the Main CPU
B
Initialization of the SDRAM
Canceling GUI CPU reset
from pin F3 of Main CPU.
Canceling PANEL CPU reset
from pin P1 of PANEL CPU.
Program transfer from
FLASH to SDRAM
Canceling DSP reset
C from pin B18 of Main
CPU. Pin G2 of DSP
(IC501) becomes "H".
Program transfer to
DSP
D
Canceling ETHER reset
from pin A18 of Main
CPU. Pin 42 of ETHER
(IC1304) becomes "H".
Canceling USB_B CONTROLLER
reset from pin A17 of Main CPU.
Pin 46 of USB_B CONTROLLER
(IC1101) becomes "H".
Initialization of the
built-in peripherals
E
Canceling ATAPI reset
from pin C10 of Main
CPU. Pin 173 of SODC
(IC7006) becomes "H".
Communication between Main CPU and SERVO
Communication between Main CPU and PANEL CPU
Communication between Main CPU and GUI CPU
F
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2
GUI CPU
DSP
Initialization of the DSP
Initialization of the SDRAM
Initialization of the DAC
DAC
Pin 12 of GUI CPU
(IC4002) cancels reset at H.
ETHER
Initialization of the ETHER
Initialization of the GUI CPU
USB_B CONTROLLER
Initialization of the
Data and Browse FL
Initialization of the USB_B
Display a Pioneer logo
on the Browse FL
Built-in peripherals
• USB_A
• ETH_MAC
• ATAPI
• SERIAL Bus
Displays Browse FL and
Data FL. LED initial lighting
CDJ-900
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3
PANEL CPU
Power on Power on
Pin 12 of PANEL CPU
(IC8003) cancels reset at H.
Initialization of the
PANEL CPU
Initialization of the JOG_FL
Display JOG FL.
LED initial lighting.
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4
SERVO
Power on
Pin 45 of SODC (IC7006)
cancels reset at H.
Initialization of the SODC
Initialization of the
loading mechanism
The insertion of the
disk is possible.
Initialization of the ATAPI
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