112
1
2
4
1
2
4
C
D
F
A
B
E
XV-DV430
Protection circuit that activates against a DVD PRTECT error
6
The DVDM monitors the voltage of the main power supply by VDET signals.
In Normal mode, the VDET signal is at the MID level (3.3 V). In the following conditions, the VDET signal level becomes L or H, and
the microcomputer is notified of this abnormality.
DVDM Assy
B
CONTROL Assy
F
R929
10k
R930
10k
R928
4.7k
R927
47k
Q924
Q923
R922
470
D922
D923
D924
IC5501
PDC104A
Q922
Q925
D925
D927
D926
D921
UDZS4.7B
Q926
Q921
V+5
V+12
R921
470
R5591
1M
R5588
220
C921
0.1
V+3R3
R933
15k
R934
10k
V+12
V+5
V+6
R925
0
R924
10k
R923
47k
VPR+8
V+12
V+12
R931
47k
C5580
0.01
17
20
8
VDET
Through
TRADE2
POWER
CN5502
CN901
µ
com
Items to be detected by VDET
(1) When the power voltages inside the DVDM become abnormal, as shown in the table below
(2) When the VDET signal to the microcomputer is interrupted because of defective soldering of the 30-pin connector or incomplete
The VDET level is lowered by the pull-down resistor (1 Mohms) on the side of the microcomputer.
Status Power
Voltage
Operation
VDET voltage
Q923
Q924
Q922
Q921
D921
D922
Q926
Q925
In Normal mode
off
off
off
off
off
off
off
off
Mid
When an abnormality is generat
VDVD+12
<1V
(on)
(on)
(on)
(off)
off
on
off
off
L
>15.5V
off
off
off
off
off
off
on
on
L
VPR+8
<5.2V
−
off
off
off
off
−
on
on
L
>12.6V
−
on
on
on
on
−
off
off
H
V+6
<3V
−
−
−
−
−
−
on
on
L
V+5
<3.6V
−
off
off
off
off
−
on
on
L
>6.6V
−
on
on
on
on
−
off
off
H
V+3R3
<2.5V
−
−
−
−
−
−
−
−
L
>4.25V
−
−
−
−
(on)
−
−
−
H
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