Operational Flow Chart - Pioneer DEH-P740MP Service Manual

7.3 OPERATIONAL FLOW CHART

Power ON
VCC=5V
Pin 16
BSENS
Pin 73
ASENS
Pin 74
DSENS
Pin 41
ASENBO←H
Pin 82
CSENS
Pin 93
Starts
communication
with Grille
microcomputer.
SWVDD←H
Pin 40
Source keys
operative
Source ON
SYSPW←H
Pin 23
Completes power-on operation.
(After that, proceed to each source operation)
BSENS=L
ASENS=L
DSENS=L
2V<CSENS<3V
300ms
300ms
In case of the above signal, the communication
with Grille microcomputer may fail.
If the time interval is not 300msec, the oscillator
may be defective.
DEH-P740MP,P7400MP,P7450MP
< <
- CSENS 2V , 3V CSENS
= =
Last source returns.
CD and TAPE loading functions are available.
Keys except for EJECT key are not available.
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