VSX-C100-S
58
1234
1234
C
D
F
A
B
E
7.1.5 Circuit Description
Protection circuit when the edge of speaker is
oveload
1
FAN detection circuit
3
DC detection circuit of SP terminal
2
R4243
10k
R405
10k
R407
1k
D401
D410
UDZS5.1B
C402
0.01
R325
330
R317
0.22
R327
1.8k
FRONT Assy
POWER Assy
+5V
FL
SP edge
GND FL
D301
D303
DAP202K
To µ-COM
To µ-COM
ODCT
FAN DCT
A speaker (6Ω) is connected between FL and GNDFL normally.
Q305 (306) (345) (346) (383) does not work because the voltage
of A point is higher than B point.
If a resistance value between FL and GNDFL becomes less than
1.2Ω, Q305 (306) (345) (346) (383) turns ON.
And ODCT becomes with negative component of output level.
→ µ-COM detects it, and turn the power OFF.
A
B
Q305
DDCT
FAN+
CN305
FAN-
FAN.STOP
1
2
3
R372
22k
R392
22k
Q384 Q385
+5V
R396
10k
R4244
47k
• Q384 and Q385 are turning OFF together normally.
(1) When the DC voltage of the plus (+) side was generated on
the SP edge
When the DC voltage of the plus (+) side was generated in L ch
or R ch, Q384 turns ON and DDCT becomes Low level if VB of
Q384 becomes higher than operating point.
→ µ-COM detects it, and turn the power OFF.
(2) When the DC voltage of the minus (-) side was generated
on the SP edge
Q385 turns ON with + side in reverse, and DDCT works.
When FAN is not connected between FAN+ and FAN-, or an
alien substance is clogged up in the FAN at the FAN LOCK
status, FAN STOP becomes the same electric potential as the
FAN- (Low).
→ µ-COM detects it, and turn the power OFF.
RR
C
R408
100k
C391
220/10
R371
22k
RL
R332
22k
FR
R331
22k
FL
POWER Assy
FRONT
Assy
+5.6V
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