Service manual

53
5
6
7
8
F
E
D
C
B
A
5
6
7
8
DEH-P2550/XM/ES
VDD=5V
Pin 41
ASENBO←H
Pin 71
Power ON
bsens=L
asens=L
dsens=L
bsens
Pin 93
asens
Pin 92
dsens
Pin 90
swvdd←H
Pin 1
Source keys
operative
Completes power-on operation.
(After that, proceed to each source operation)
SYSPW←H
Pin 21
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.
CSENS
Pin 77
2V < CSENS < 3V
- CSENS 2V, 3V CSENS
Last source returns.
CD loading functions are available.
Keys except for EJECT key are not available.
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7.3 OPERATIONAL FLOW CHART