S-DV1000SW
37
5
7
8
5
7
8
C
D
F
A
B
E
6. ADJUSTMENT
7. GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 PROTECTION CIRCUIT
There is no information to be shown in this chapter.
to XPROTECT
µ
-com
AMP Assy
R108
27k
R101
(R104)
1k
C101
(C102)
1/50
Q102
(Q104)
Q101
(Q103)
D101
(D102)
D105
(D106)
UDZS7.5B
Q101
(Q103)
C2
E2
B2
E2
C2
B2
C
E
B
E
C
B
Q102
(Q104)
R102
(R105)
10k
R103
(R106)
10k
A
B
V+5D
VD+5
VH+
(VP+15)
VH–
(VA–12)
Note: • Refer to the Schematic Diagram about the actual circuit.
(The
&
number corresponds to the marked circuits.)
¶
At normal state as Q101 (E2, B2, C2)(Q103), Q102 (E2, B2, C2)
(Q104) is ON state,
A
point is about 5V. Therefore
B
point
is also almost the same voltage as
A
and Q101 (E, C, B) (Q103)
do not turn ON, and Q102(E, C, B) do not turn ON.
(1) When VH+(VP+15) is short-circuited (to GND)
B
point voltage becomes almost GND level and turned to be opera-
ting point for Q101(E, C, B)(Q103). Therefore Q101(E, C, B)
(Q103) turns ON. Also Q102(E, C, B)(Q104) turns ON. Then
XPROTECT becomes LOW level.
→
U-com detects the XPROTECT level and sets Power OFF.
(2) When VH–(VA–12) is short-circuited
AS V
E
of Q102 (E2, C2, B2)(Q104) becomes the same voltage as
V
B
, Q102(E2, C2, B2) (Q104) turns OFF.
And Q101 (E2, B2, C2)(Q103) becomes OFF. Therefore the
voltage of
points are not 5V, Q101 (E, C, B)(Q103) turns
ON. Also Q102(E, C, B)(Q104) turns ON. Then XPROTECT
becomes LOW level.
U-com detects the XPROTECT level and sets Power OFF.
(3) When VD+5 is short-circuited
The line voltage of XPROTECT becomes Low level, then U-com
detects and set the POWER OFF.
3
Short Circuit Detection Circuit of AMP Power Line
(+15V(VP+15), Vb+5, -12V(VA-12))
The Circuit for making POWER OFF when VP+15, VD+5 and
VA-12 is short-circuited (to GND).
R108
27k
VP+8
VD+5
XPROTECT
Q106
DTC124EUA
Q107
DTA124EUA
D104
1SS355
XPROTECT
µ
-com
Q3654
2SD2144S
(VW)
Q3652
DTA124TK
Q3651
RN1901
Q3651
RN1901
D3658
UDZS7.5B
D3657
1SS355
FAN+
FAN-
C2
E2
C
E
B
B2
D3656
S5688G
D3655
1SS133
V+12F
VD+5
R3656
22k
R3655
8.2k
R108
27k
R3654
1.8k
R3658
2.2k
R3657
33(1/4W)FU
C3652
47/50
TUNER
AMP Assy
AMP Assy
V-12F
A
4
Short Circuit Detection Circuit of DVD Power Line
(VP+8)
6
FAN Detection Circuit
VP+8 is Power Line when the set is DVD Function (TUNER is
High level).
At this time when VP+8 is short-circuited, as TUNER is Low level,
Q106 turns ON and XPROTECT becomes Low level.
→
U-com detects the XPROTECT level and sets Power OFF.
Except DVD Function even if VP+8 is GND level, as TUNER is
also High level, Q107 is OFF and XPROTECT does not become
LOW level.
When the FAN is not connected between FAN+ and FAN-, or FAN
is locked state as the foreign matter is blocked, Q3652 Base turns
open, and then Q3652 and Q3651(E, C, B) turns OFF. Then Q3651
(E2, B2, C2) turns ON and XPROTECT becomes LOW level.
→
U-com detects the XPROTECT level and sets Power OFF.
When FAN+ and FAN- is short-circuited,
A
point voltage becomes
higher than GND level because of part D3656 and D3657.
Then it is lower than part D3658, Q3651(E, C, B) turns OFF and
Q3651(E2, B2, C2) turns ON, and XPROTECT becomes LOW level.
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