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5
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.
V+5V
V+12
R851
47K
R852
15K
R853
10K
GNDD
V+12
R823
Q821
V+SR5
V+5V
15K
2SA1576A(RS)
D861
R824
R822
10K
47K
D862
D852
GNDD
Items to be detected by VDET
(1) When the power voltages inside the DVDM become abnormal, as shown in the table below
Status
In Normal mode
When an abnormality is generat
(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.
5
6
VPR+8
V+12
R881
47K
R882
10K
R801
470
V+3R3
GNDD
R821
Q801
DTC124EUA
R821
10K
GNDD
Power
Voltage
Q881
<8.8V
VDVD+12
>15.5V
<5.2V
VPR+8
>12.6V
V+6R5
<3V
<3.6V
V+5
>6.6V
<2.5V
V+3R3
>4.25V
6
7
B
DVDM Assy
NORMAL
: 3.3V
<
ABNORMAL :
0.5VDD
>
0.85VDD
R801
470
4
VDET
Operation
VDET voltage
Q851
Q821
Q801
off
off
off
off
on
on
off
on
off
off
on
on
−
off
on
on
−
−
on
on
−
−
on
on
−
off
on
on
−
on
off
on
−
−
−
−
−
−
−
−
XV-EV500
7
8
C
IFAF Assy
R5594
220
4
VDET
µcom
17
C5962
0.01
IC5501
R5967
1M
PDC127A
<
L
2.5VDD
>
H
4.25VDD
Mid 3.3V
L
L
L
L
L
L
L
L
H
8
A
B
C
D
E
F
119
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