Operational Flow Chart - Pioneer DEH-P550MP Service Manual

1

7.3 OPERATIONAL FLOW CHART

Power ON
A
VCC=5V
Pin 14
bsens
Pin 73
B
asens
Pin 72
dsens
Pin 39
C
ASENBO←H
Pin 80
csens
Pin 91
Starts
communication
with Grille
microcomputer.
D
SWVDD←H
Pin 38
Source keys
operative
E
Source ON
SYSPW←H
Pin 1
Completes power-on operation.
(After that, proceed to each source operation)
F
74
1
2
BSENS=L
ASENS=L
DSENS=L
2V < CSENS < 3V
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-P550MP/XN/UC
2
3
< <
- CSENS 2V, 3V CSENS
= =
Last source returns.
CD loading functions are available.
Keys except for EJECT key are not available.
300ms
3
4
4