Diagnosis; Operational Flowchart - Pioneer DEH-P5050UBXN Service Manual

5

5. DIAGNOSIS

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5.1 OPERATIONAL FLOWCHART

Power ON
Vcc = 5 V
DSENS
ASENBO<-H
TE
L 13942296513
communication
with Grille
microcomputer.
SWVDD<-H
Source keys
operative
Source ON
SYSPW<-H
www
Completes power-on operation.
(After that, proceed to each source operation)
.
5
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Pin14
BSENS
Pin16
BSENS = L
ASENS
Pin73
ASENS = L
Pin9
DSENS = L
Pin38
CSENS
Pin91
2 V < CSENS < 3 V
Starts
Pin47
In case of the above signal, the communication
with Grille microcomputer may fail.
If the time interval is not 300 msec, the oscillator
may be defective.
Pin46
x ao
y
i
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6
8
Q Q
3 6 7 1 3
- 2 V < CSENS < 3 V
Last source returns.
CD loading functions are available.
Keys except for EJECT key are not available.
300 ms
300 ms
u163
.
DEH-P5050UB/XN/ES
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
19
8