Service manual

DEH-3750MP/XU/GS
67
5678
56
7
8
C
D
F
A
B
E
7.3 OPERATIONAL FLOW CHART
AVREF1, VDD, AVDD=5V
Pin 7, 68, 74, 75
Power ON
bsens=L
asens=L
bsens
Pin 64
asens
Pin 63
swvdd←L
Pin 21
Source keys
operative
Completes power-on operation.(After that, proceed to each source operation.)
SYSPW←H
Pin 43
Starts communication with Grille microcomputer.
Source ON
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.