XV-HA5
84
1
2
3
4
1
2
3
4
C
D
F
A
B
E
DVDM Assy
IF Assy
R5517
220
IC5501
PDC125A
Q801
DTC124EUA
D852
D862
D861
D801
UDZS4.7B
R5617
1M
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
Q926
25A1576A(RS)
D851
2SA1576A(RS)
D851
17
4
4
VDET
Through
TRADE2
POWER
CN5952
CN901
µ
com
Explanation about the operation of VDET
VDET monitors the occurrence of abnormity in each power of DVDM with VDET signals.
VDET is at the Mid level (3.3V) under the normal condition. Under the following conditions, it is at the L or H level and the
abnormity is notified to the microcomputer.
Abnormity detection items of VDET
(1) In case that each power supply voltage in DVDM is in the abnormal state as shown in the following table;
State
Power
supply
Voltage
Operation
VDET voltage
Q881
Q851
Q821
Q801
Normal
off
off
off
off
Mid 3.3V
Abnormal
V+12
<8.8V
on
on
off
on
L
>15.5V
off
off
on
on
L
VPR+8
<5.2V
off
off
on
on
L
>12.6V
on
off
off
on
L
V+6R5
<3V
off
off
on
on
L
V+5
<3.6V
off
off
on
on
L
>6.6V
off
on
off
on
L
V+3R3
<2.5V
off
off
off
off
L
>4.25V
off
off
off
off
H
3.3 DETECT
Q881
2SA1576A(RS)
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
(2) For the control specification of the 3.3 DETECT(VDET) terminal in the system microcomputer (PDC125A), see the "7.1.9
System Computer PROTECT Specification".
(See the "
PROTECT Operation Map", too.)
Explanation about the operation of PROTECT
If XPROTECT (22pin of IC5501) has an abnormity as mentioned
below and the prescribed abnormity or failure detection voltage,
the microcomputer detects it, and immediately POWER is turned
OFF and TIMER LED starts flashing.
POWER ON will be disabled for one minute after POWER OFF
due to detection of failure.
However, this one-minute standby can be canceled by
entering the Service Test Mode.
The circuit of this XPROTECT detects the following states:
1
Detection of a short of PRE5.....If the voltage of PRE5 is
reduced (below 3.2V), the XPROTECT port will be almost 0.
2
Detection of a short of PRE12.....If the voltage of PRE12 is
reduced (below 3.2V), the XPROTECT port will be almost 0.
3
FAN+B (This is effective for the detection of V+B and PRE12, too.)
If the voltage of FAN+B is reduced (below 3.2V), the XPROTECT
port will be almost 0.
4
Short of FAN.....If a failure occurs in FAN, causing a short-circuit
inside, Q3654 will be tuned ON and the XPROTECT will
become almost 0.
5
FAN Open.....If there is a failure in FAN or FAN doesn't rotate
due to some stress, Q3655 will be turned OFF and XPROTECT
will become almost 0.
6
Detection of a failure in VA-12.....If -12V exceeds -8V, Q92 will
be turned ON, and XPROTECT will be reduced almost to 0.
*
For the control specification of the XPROTECT terminal of the
System microcomputer (PDC125A), see the "7.1.9 System
Computer PROTECT Specification".
7
Detection of a failure in +9V for TUNER.....If VX+9V (about
9.0V) becomes 1V or less, a failure is detected.
ON/OFF of each transistor
indicates the operating state
in case of regarding the tran-
sistor as a switching element.
Содержание XV-HA5
Страница 15: ...XV HA5 15 5 6 7 8 5 6 7 8 C D F A B E ...
Страница 21: ...XV HA5 21 5 6 7 8 5 6 7 8 C D F A B E MT1389FE C2 L R CY B Cb G Y C V S_C S_Y D B 1 2 B 1 2 DVDM ASSY AWM7966 ...
Страница 22: ...XV HA5 22 1 2 3 4 1 2 3 4 C D F A B E 3 4 DVDM ASSY 2 2 A B 2 2 B 2 2 DVDM ASSY AWM7966 D ...
Страница 38: ...XV HA5 38 1 2 3 4 1 2 3 4 C D F A B E ...
Страница 85: ...XV HA5 85 5 6 7 8 5 6 7 8 C D F A B E ...
