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1
QQ
3 7 63 1515 0
A
PROTECTION UNIT
To PowerAMP A'ssy
CN503
B2B-EH
1
POSISTOR
2
B
To PowerAMP A'ssy
CN501
!
B4B-EH
R501
560 1/4W
1
OVLD DCT+N
AMRS
2
OVLD DCT-N
R502
3
AMP OUT N
560 1/4W
AMRS
4
GNDA
C
GNDA
TE
L 13942296513
To PowerAMP A'ssy
CN502
!
B4B-EH
R521
560 1/4W
AMRS
1
OVLD DCT+P
2
OVLD DCT-P
R522
3
AMP OUT P
560 1/4W
4
AMRS
GNDA
D
GNDA
V+12V
From PRI A'ssy
CN507
B7B-EH
V+12
1
GND
2
3
V-12
4
V-12U
E
GNDS
5
PRT LT
6
GNDS
7
GNDS
GNDP
Overcurrent detection
Each of Q501, Q502, Q521, and Q522 is an overcurrent detection
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transistor. For example, in the case of Q501, bridge detection by
R501, R503, emitter resistor (0.22 ohm ÷ 5 [parallel push-pull
circuits] = 0.044 ohm), and load is performed.
If the bridge becomes out of balance, the transistor is turned on
F
and the protection function is activated (speaker relay: OFF, main
power: OFF).
16
1
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2
R542
22k
R543
5.6k
1SS133
GNDP
V-12V
V-12U
GNDS
x
ao
y
.
i
2
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3
8
R508
220k
Q Q
3
6 7
1 3
R528
220k
D524
DC detection
DC detection transistors are Q503-Q504 and Q523-Q524.
The low-pass filter (R508-C503 and C504 [R528-C523 and C524])
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cuts the AC component.
If current higher than that determined by a ratio of resistance
values of R508 and R509 flows and the DC component reaches
.
about 3 V, the transistor is turned on and the protection function is
activated (speaker relay: OFF, main power: OFF).
TAD-M600
3
4
2 9
9 4
2 8
R552
2.2k
1 5
0 5
8
2 9
9 4
m
co
4
9 9
2 8
9 9
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