Pioneer MJ-L5 Service Manual page 74

MJ-L5, SP-L5
• Rise-up sequence after AC power applied of processor microcomputer
• Power on sequence of processor microcomputer
Power on
process
No
POWER STEP 0 ?
Yes
Turn on the power
of periphery circuit
XPOWER ON
(pin39)→ L
No
POWER STEP UP
74
Reset
Initialize the
internal data
Bus data
transmission
No
30 msec. passed ?
Yes
No
System power on ?
Yes
Go to power
on process
POWER STEP : These steps are the step to turn on the
power to manage inside.
No
POWER STEP 1 ?
Yes
POWER STEP 2 ?
300 msec. passed ?
Yes
No
400 msec. passed ?
Port setting of
each device
Perform the
initial setting
Last data
of port of
transmission
DOLBY and
VOL IC, etc.
POWER STEP UP
POWER STEP UP
Release the hardware reset.
Set the port status.
System bus communication process.
Perform the process every 30 msec.
Check that system power on information from the CD
receiver is received with system bus communication.
No
Yes
POWER STEP 3 ?
Yes
No
2 sec. passed ?
Perform the
last data
LED lights up
transmission
to DOLBY
and VOL IC,
etc.
POWER STEP UP
RETURN
No
Yes
No
POWER STEP 4 ?
Yes
Yes
No
4 sec. passed ?
Yes
Release the
mute and relay
XMUTE(pin1)
SPCONT(pin37) → H
XSMUTE(pin43) → H
XCMUTE(pin44) → H
POWER STEP UP
→ H