XV-DV333
100
1
2
3
4
1
2
3
4
C
D
F
A
B
E
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.
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
insertion of FFC
→
The VDET level is lowered by the pull-down resistor (1 Mohms) on the side of the microcomputer.
Status Power
Voltage
Operation
VDET voltage
Q881
Q851
Q821
Q801
In Normal mode
off
off
off
off
Mid 3.3V
When an abnormality is generat
VDVD+12
<8.8V
on
on
off
on
L
>15.5V
off
off
on
on
L
VPR+8
<5.2V
−
off
on
on
L
>12.6V
on
−
−
on
L
V+6R5
<3V
−
−
on
on
L
V+5
<3.6V
−
off
on
on
L
>6.6V
−
on
off
on
L
V+3R3
<2.5V
−
−
−
−
L
>4.25V
−
−
−
−
H
DVDM Assy
B
CONTROL Assy
F
R5588
220
IC5501
PDC122A
R5591
1M
C5580
0.01
17
6
VDET
CN5502
µ
com
Q801
DTC124EUA
D852
D862
D861
D801
UDZS4.7B
C801 0.1
R801
470
VDET
NORMAL : 3.3V
ABNORMAL :
<
0.5VDD
>
0.85VDD
L
<
2.5VDD
H
>
4.25VDD
V+5V
V+SR5
V+3R3
Q821
2SA1576A(RS)
D851
2SA1576A(RS)
D851
4
Through
TRADE2
POWER
CN901
Q881
2SA1576A(RS)
D881
R882
10K
GNDD
GNDD
V+12
V+5V
VPR+8
R801
470
R823
15K
GNDD
V+12
R824
10K
R822
47K
R851
47K
R881
47K
R821
10K
R821
R852
15K
GNDD
V+12
R853
10K
