Diagnosis; Operational Flowchart - Pioneer DEH-3200UB/XNUC Service Manual

5

5. DIAGNOSIS

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5.1 OPERATIONAL FLOWCHART

Power ON
VCC1 = 3.3 V
BSENS
ASENS
DSENS
communication
with Grille
microcomputer.
TE
L 13942296513
SWVDD <- H
Source keys
operative
Source ON
SYSPW <- H
Completes power-on operation.
(After that, proceed to each source operation)
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Pin 14
Pin 16
BSENS = L
Pin 18
ASENS = L
Pin 17
Starts
Pin 47
In case of the above signal, the communication
with Grille microcomputer may fail.
If the time interval is not 500 msec, the oscillator
may be defective.
Pin 46
x ao
y
i
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6
8
Q Q
3 6 7 1 3
500 ms
500 ms
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.
DEH-4250SD/XNES
6
7
2 9 9 4 2 8
1 5 0 5 8 2 9 9 4
m
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
23
8