VSX-2016AV-S
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7.1.2 PROTECTION CIRCUIT SPECIFICATION
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 120 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)
With 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 28 of IC101)
Turns muting on and
speaker relay off, and
immediately turns off the
power. Then flashes
PHASE CONTROL
indicator.
None
Overheat
detection
Self reset type protection
feature by temperature-rise of
heat sink
Detects when the TEMP2 port
becomes "H" .
(Pin 44 of IC2301)
Turns muting on and
speaker relay off, then
turns off the power after 3
seconds.
Flashing "OVERHEAT"
for 3 seconds.
If the TEMP2 port
becomes "L" within 3
seconds, the unit returns
to normal condition
automatically.
12V
trigger
failure
detection
To detect the shortcircuit of
12V trigger output (load more
than 50mA) (for protection of
the amplifier)
Detects when the 12VDET port
decoms "H".
(Pin 44 of IC2301)
Turns 12V trigger output
to off.
Flashing "12V ERR"
Continue showing
warning.
Release the FL indication
by switching the INPUT
SEL or the turns the power
off.
R5714
R5721
Q5572
GAMP
GNDU
Q5571
IC5301
IC5302
R5341
OUTPUT
DC DETECTOR
R ch
C ch
SR ch
SBR ch
SL ch
SBL ch
+VL
V+5UM
Normal: High (5V)
DC det: Low (0V)
+DC detection: Q5571 base is "H".
→
Collector of Q5571 and Q5572 are "L".
-DC detection: Q5572 emitter is minus to the base.
→
Collector of Q5571 and Q5572 are "L".
-VL
R5342
R5441
R5442
R5541
R5542
R5325
R5327
R5326
R5571
R5641
R5642
C5571
R164
C120
D104
FFC J43
UCOM
IC101
120
CN5302
-5
CN5301
-8
CN5702
-7
CN5703
-15
CN5602
-6
CN5601
-8
L ch
R5041
R5042
R5141
R5142
R5241
R5242
CN5001
-6
CN103
-5
POWER AMP-R ASSY
POWER AMP-L ASSY
POWER
PROTECT
ASSY
POWER
AMP IN ASSY
MAIN CONTROL ASSY
C
AJ
AG
AI
AD
Содержание Elite VSX-81TXV
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