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HCD-EC68/EC78
Q Q
3 7 6 3 1 5 1 5 0
7-6.
SCHEMATIC DIAGRAM - MAIN Board (1/2) -
1
2
3
4
MAIN BOARD (1/2)
A
CN601
3P
TP601
VDD+
M
1
M601
TP602
(FAN)
GND
2
8.8
R604
VDD+
100k
3
0
B
∗R605
15 (EC78: AEP, RU)
56 (EC68/EC78: E2,
E3, E51, MX, AR)
C601
C602
47
22
(EC78)
25V
25V
CN602
5P
IN-R
1
F
A-GND
2
C
IN-L
3
HI AMP
BOARD
AMP-ON
4
CN152
PROTECT
5
(Page 30)
PA-GND
1
E
TP609
OUT-R
2
+VH
3
HI AMP
BOARD
-VH
D
4
CN151
TP612
OUT-L
5
(Page 30)
CN632
RY601
5P
TB601
R608
10
TP614
R
SPEAKER
HIGH FREQ.
L602
IMPEDANCE
USE 8Ω
L
TP613
R606
10
E
C603
4700p
L601
C606
4700p
CN603
(Page 31)
5P
TP615
IN-R
1
C700
H
1000p
A-GND
2
TP617
C699
IN-L
3
1000p
LOW
TP618
F
AMP
AMP-ON
4
BOARD
TP619
CN102
PROTECT
5
T E
L
1 3 9 4 2 2 9 6 5 1 3
PA-GND
1
G
TP621
OUT-R
2
TP622
+VH
3
LOW
TP623
AMP
-VH
4
BOARD
TP624
CN104
OUT-L
5
(Page 31)
G
CN633
5P
D601
MC2838-T112-1
R610
R609
R612
4.7k
4.7k
(EC78)
TB602
10
SPEAKER
TP626
LOW FREQ.
IMPEDANCE
H
R
L604
USE 8Ω
L
TP625
R611
10
SPEAKER
IMPEDANCE
L603
USE 6Ω
(EC68)
I
ET601
(CHASSIS)
C610
C609
4700p
4700p
ET602
J
(CHASSIS)
w w w
HCD-EC68/EC78
5
6
7
8
Q601
R726
R725
R724
KTA1266GR-AT
15
15
15
0.4
16.6
JW750
JW751
JW752
Q603
R626
2SC3052F-T1-LF
10k
PROTECT
16.7
Q601, 602
DETECT
FAN MOTOR DRIVE
R627
2SC3052F-T1-LF
4.7k
DC DETECT
Q602
16.7
2SC3052F-T1-LF
D621
MAZ8043GMLS0
0
R629
4.7k
0
R601
C613
C614
470
10
4.7
50V
50V
R634
R635
R636
56
56
56
D603
R632
MA2J1110GLS0
100k
R633
100k
C604
C615
0.1
0.1
C605
C616
0.1
0.1
R607
R631
10
10
R638
R641
R642
Q612
∗
∗
∗
ISA1235AC1TP-1EF
∗R638, 641, 642
D604
56 (EC78)
MA2J1110GLS0
8.9
RY602
68 (EC68)
R640
100k
D605
R639
100k
MA2J1110GLS0
C607
C617
0.1
0.1
C618
C608
0.1
0.1
R728
R648
47k
R651
4.7k
4.7k
R650
R727
4.7k
4.7k
R645
2.2k
0.8
0.7
R615
C620
C619
R643
10
100
0.01
10k
10V
Q604
2SC3052F-T1-LF
RELAY DRIVE
x
a o
y
.
i
http://www.xiaoyu163.com
9
10
11
12
PROTECT
R672
10k
D614
MA2J1110GLS0
10.8
Q608
2.9
O-POWER
R667
R614
R613
D606
47k
10k
10k
MC2836
2.3
R666
1k
C630
47
10V
AMP-R
D602
MC2838-T112-1
AMP-L
AMP-STBY
Q605
Q606
2SC3052F-T1-LF
2SC3052F-T1-LF
R652
R646
8.8
8.8
100
100
0
Q605, 606
0
PROTECT DETECT
C695
C696
1
1
C631
C632
R677
100
4.7
10k
16V
50V
AMP-R
R673
AMP-L
R676
10k
0
D615
1N4002B
Q
Q
R658
3
7
6
470
2W
HP-R
R662
470
2W
HP-L
PROTECT
C629
4700p
AMP-ON
R669
100k
8.8
R637
4.7k
0
C714
47
R644
R663
1k
10V
1k
R670
10k
Q611, 612
PROTECT
DETECT
8.8
0
R628
R674
R675
10k
47
47
Q611
2SC3052F-T1-LF
u 1 6 3
28
28
2
4
8
9
9
13
14
15
16
D609
1N5402-F46
R619
3.9k
R791
100k
R625
33k
(EC78)
D612
2A02M
D611
2A02M
D630
1N4002B
D629
1N4002B
(EC68)
C628
1000
25V
C627
2200
(EC78: AEP, RU)
C641
25V
R729
R691
R689
3.3
100k
27k
10k
EC68/EC78: E2,
50V
E3, E51, MX, AR
R686
R690
56k
D628
2.2k
MA2J1110GLS0
4.2
R692
0.7
4.7k
Q618
0
ISA1235AC1TP-1EF
C642
DC DETECT
0.022
4.7
0.4
R678
47k
3
1
5
1
5
0
Q619
8
9
2SC3052F-T1-LF
R685
RELAY DRIVE
4.7k
D617
MC2838-T112-1
R687
22k
D631
MA2J1110GLS0
m
c o
.
2
8
9
9
17
18
CN604
8P
TP627
RELAY ON/OFF
1
TP628
V STBY
2
TP629
AC DETECT
J
3
4
VH(AC)
5
VL(AC)
PT
BOARD
GND
6
CN051
(Page
VL(AC)
7
VH(AC)
36)
8
2
4
9
8
2
9
9
R693
1k
1
1
MAIN
BOARD
2
(2/2)
(Page 29)
3
IN
1
D
GND
OUT
3
REG
(Page 34)
BOARD
CN605
W610
9P
TP630
AUDIO-L
1
AUDIO-L
2
A-GND
AUDIO-R
TP631
AUDIO-R
3
C
HP-GND
4
TP632
HP-L
HP-L
5
TP633
JACK
HP-R
6
HP-R
BOARD
AMP-ON
TP634
(Page
7
AMP-ON
SP-RELAY
TP635
34)
SP-RELAY
8
GND
9
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