16
TAD-M600
1
2
3
4
A
B
C
D
E
F
1
2
3
4
V-12U
GNDP
GNDS
V-12V
GNDS
Q551
Q553
DTC143ES
Q521
2SC2240(BL)
Q523
Q524
2SC2240(BL)
Q503
Q504
2SC2240(BL)
Q552
2SC2240(BL)
Q501
2SC2240(BL)
Q542
2SC2240(BL)
Q505
2SC2240(BL)
Q541
2SC2240(BL)
D503 1SS133
D522
1SS133
D502
1SS133
D524
1SS133
D504
1SS133
D501
1SS133
D523
1SS133
D521
1SS133
R528
220k
R501
AMRS
560 1/4W
R529
47k
R509
47k
R522
AMRS
560 1/4W
R502
AMRS
560 1/4W
R508
220k
R521
AMRS
560 1/4W
R503
10k
R504
10k
R524 10k
R523 10k
R527
2.2k
R507
2.2k
R512
1.2k
C541
NM
R542
22k
R543
5.6k
R545
2.2k
C552
0.01u/50
C551
0.022u/50
MTF
R553 1.2k
R552
2.2k
R551
4.7k
R554 4.7k
R555
4.7k
R556
1.2k
C503
33u/25
C524
33u/25
C523 33u/25
C504
33u/25
2SA970(BL)
2SA970(BL)
Q522
2SA970(BL)
Q502
2SA970(BL)
2SA970(BL)
R541 6.8k
R544
2.7k
CN503
B2B-EH
1
2
CN501
B4B-EH
1
2
3
4
CN502
B4B-EH
1
2
3
4
R510
470
R511
470
R531
470
R530
470
GNDP
C505
220p
GNDA
C501
2.2u
50V
C521
2.2u
50V
C502
2.2u
50V
C522
2.2u
50V
D559
1SS133
D560 1SS133
D561
1SS133
D562
1SS133
D563 1SS133
D564
1SS133
D565 1SS133
D566
1SS133
R513
100k
R533 100k
R514
100k
R534
100k
D507
1SS133
D527
1SS133
D508
1SS133
D528
1SS133
OVLD DCT+N
OVLD DCT-N
AMP OUT N
POSISTOR
PROTECTION UNIT
GNDA
OVLD DCT+P
OVLD DCT-P
AMP OUT P
GNDA
To PowerAMP A'ssy
To PowerAMP A'ssy
To PowerAMP A'ssy
!
!
Overcurrent detection
Each of Q501, Q502, Q521, and Q522 is an overcurrent detection
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
and the protection function is activated (speaker relay: OFF, main
power: OFF).
DC detection
DC detection transistors are Q503-Q504 and Q523-Q524.
The low-pass filter (R50
8
-C503 and C504 [R52
8
-C523 and C524])
cuts the AC component.
If current higher than that determined by a ratio of resistance
values of R50
8
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).
www. xiaoyu163. com
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