61
VSX-LX51
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.2 CIRCUIT DESCRIPTION
[1] Protection Circuit Process List
DC Detection Circuit
Item
Purpose
Detection Method
Process
Warning Indication
Remarks
DC
detection
To detect amplifier damage
(defect status)
A process to protect speakers
(for protection of connected
external devices)
Detects when the DC_PROTECT
port becomes "L".
(Pin 103 of IC101)
Turns muting on and
speaker relay off, then
turns off the power after 3
seconds. Then flashes
MCACC indicator.
Flashing "AMP ERR" for
3 seconds.
Once detected and turned
the power off, input a key
never again. If the
DC_DET port becomes
"H" within 3 seconds, the
unit returns to normal
condition automatically.
AMP
overload
To detect overloading
(abnormal status)
W
ith low-load driving or a
short circuit of the speaker
terminals (for protection of the
amplifier)
Detects when the OL_DET port
becomes "L" (checks by interrupt).
(Pin 26 of IC101)
Turns muting on and
speaker relay off, and
immediately turns off the
power. Then flashes
PHASE CO
N
TROL
indicator.
N
one
Overheat
detection
Self reset type protection
feature by temperature-rise of
heat sink
Detects when the TEMP2 port
becomes "H" .
(Pin 24 of IC3004)
Turns muting on and
speaker relay off, then
turns off the power after 3
seconds.
Flashing "O
V
ERHEAT"
for 3 seconds.
If the TEMP2 port
becomes "L" within 3
seconds, the unit returns
to normal condition
automatically.
12
V
trigger
failure
detection
To detect the shortcircuit of
12
V
trigger output (load more
than 50mA) (for protection of
the amplifier)
Detects when the 12
V
DET port
decoms "H".
(Pin 122 of IC101)
Turns 12
V
trigger output
to off.
Flashing "12
V
TRG ERR"
Continue showing
warning.
Release the FL indication
by switching the I
N
PUT
SEL or the turns the power
off.
R5744
R5742
Q5742
GAMP
G
N
DU
Q5741
Q5301
Q5302
R5341
OUTPUT
DC DETECTOR
R ch
C ch
SR ch
SBR ch
SL ch
SBL ch
+
V
L
V
+5UM
V
+5UM
N
ormal: High (5
V
)
DC det: Low (0
V
)
+DC detection: Q5741 base is "H".
–> Collector of Q5741 and Q5742 are "L".
-DC detection: Q5742 emitter is minus to the base.
–> Collector of Q5741 and Q5742 are "L".
-
V
L
R5342
R5441
R5442
R5541
R5542
R5325
R5327
R5326
R5741
R5641
R5642
C5741
R291
C291
D291
D292
UCOM
IC101
103
C
N
5
8
03
-11
C
N
4
8
0
8
-11
C
N
4
8
03
-11
L ch
R5041
R5042
R5141
R5142
R5241
R5242
C
N
10
8
-11
PO
W
ER AMP ASSY
MAI
N
ASSY
B
R
I
N
TERFACE
ASSY
E
Содержание VSX-1018AH-K
Страница 8: ...8 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 2 2 SPECIFICATIONS LX51 13 3 kg 1018AH ...
Страница 9: ...9 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F 2 3 PANEL FACILITIES 1 Rear panel VSX LX51 ...
Страница 10: ...10 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 VSX LX51 2 Front panel ...
Страница 11: ...11 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F 3 Display ...
Страница 12: ...12 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 4 Remote control AXD7518 VSX LX51 Only ...
Страница 13: ...13 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F ...
Страница 75: ...75 VSX LX51 5 6 7 8 5 6 7 8 A B C D E F ...
Страница 82: ...82 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 9 4 POWER AMP SECTION S L K R I W Y X J N ...
Страница 132: ...132 VSX LX51 1 2 3 4 A B C D E F 1 2 3 4 ...
