Diagnosis; Power On Sequence - Pioneer MEP-7000 Service Manual

1

5. DIAGNOSIS

5.1 POWER ON SEQUENCE

A
[1] Operation sequence after power-on of the MEP-7000 (Normal Style)
ATAPI Drive
Power-on
Canceling reset of SODC
(IC106/906) at Pin 45
Initial setting
B
C
Initializing the Loading
mechanism
Once a disc is inserted,
D
the process for
loading and startup starts.
Once a disc is inserted,
the process for
loading and startup starts.
E
Data reading, etc.
F
48
1
2
Canceling reset of the SOUTH
CPU (IC202) at Pin 13
Initial setting for the SOUTH CPU
Data and clock signals
are output from Pins
Initialization of the SDRAM
55 and 53 of the CPU
(IC202),respectively.
Program transfer from the
For details on the
flash memory to SDRAM
downloading
sequence,see
Canceling reset of the
"[3] Downloading
Sequence."
Program transfer to the
AUDIO DSP (IC501)
Program transfer to the
Canceling reset of the FPGA
Starting communication
with the control unit
A disc can be loaded
before starting
Canceling reset of DAC
communication
with the MAIN Assy.
Canceling reset of the
Starting communication
with the ATAPI system
peripheral devices
Process with the keys held
pressed for several seconds
Is the Drive Unit
in Service mode?
If a disc is loaded,
the process for
playback starts.
Judging of DVD/CD
Process for DVD playback
MEP-7000
2
3
Drive Unit
Power-on
Data and clock signals
are output from Pins
55 and 53 of the
SOUTH CPU (IC202),
respectively.
After transfer to
AUDIO DSP
is completed, FDONE
(Pin 37) becomes high.
For details on the
downloading sequence,
see "[3] Downloading
FPGA (IC301)
ATAPI system
Items with NG
check results can be
confirmed in
Service mode.
Checking the
Check if the unit
is in Service mode.
during power-on
Yes
Service mode indication
No
CD
DVD
Process for CD playback
3
4
Control Unit
(Normal Style)
Power-on
Canceling reset of the NORTH
CPU (IC601) at Pin 13
Initial setting for the NORTH CPU
Initialization of the SDRAM
Program transfer from the
flash memory to SDRAM
Canceling reset of the
the FPGA
video encoder
Process of reading data
with the keys held pressed
for several seconds
during power-on
Sequence."
The "PIONEER" and "PRO DJ"
indications appear on the LCD.
Is the Control Unit
in Service mode?
No
The LOOP IN and LOOP OUT
LEDs light.
The OEL displays "EJECT."
The OEL displays "noDISC."
The "PIONEER" and "PRO DJ" indications
Afterwards, processes for key-status
input and display data output follow.
4
Yes
S