Pioneer MJ-L5 Service Manual page 70

MJ-L5, SP-L5
• Power on sequence of MD microcomputer
Check the trigger that is
turned the power on, and
issue the system power on
request of system bus
command.
Wait until the power
supply of mechanism
system becomes
stable.
Release the
mechanism reset
signal (pin 21).
70
Power on check
No
Is DEMO mode ?
Yes
Yes
System power on ?
No
EJECT KEY ?
No
PLAY KEY ?
No
No
Disc insertion ?
Yes
System power
on request
System power on ?
Yes
Power on
process
Turn on the power of
the periphery circuit.
→ 1
P.S.VM+5
P.S.VMD+5 → 0
→ 1
P.S.+5
→ 0
MDRST
→ 1
PDOWN
No
Wait for 500msec.?
Yes
MDRST → 1
Power can not on by MD key operation if DEMO mode
information from the CD receiver is not received.
Did the power turn on by the CD receiver, and receive
power on of the system bus communication.
Yes
Was EJECT key pressed ?
Yes
Was PLAY key pressed ?
Was a disc inserted ?
Transfer the system power on request
command to the CD receiver.
Power on process is not done until system power on
No
from the CD receiver is received.
(It keeps waiting for system power on information.)
Power on for mechanism (pin 75)
Digital power on for mechanism (pin 76)
Power on for system (pin 77)
Mechanism reset on (pin 21)
Release power down detection of mechanism (pin 24)
No
Wait for mech.
mode stop?
Yes
No
Wait for 300msec.?
Yes
Power on end
Start the communication with
mechanism controller.
Wait for the completion of
the initialize process of
mechanism controller.
Waiting time of information
reception from mechanism
controller.