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1
7.3 OPERATIONAL FLOW CHART
A
B
ASENBO←H
communication
microcomputer.
C
Source keys
operative
D
Completes power-on operation.
(After that, proceed to each source operation)
66
1
2
Power ON
VCC=5V
Pin 16
BSENS
Pin 73
BSENS=L
ASENS
Pin 74
ASENS=L
DSENS
Pin 41
DSENS=L
Pin 82
CSENS
Pin 93
2V<CSENS<3V
Starts
with Grille
SWVDD←H
Pin 40
Source ON
SYSPW←H
Pin 23
KEH-P7020R
2
3
<
- CSENS 2V , 3V CSENS
=
Last source returns.
CD and TAPE loading functions are available.
Keys except for EJECT key are not available.
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.
3
4
<
=
4
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