Sony HCD-EC68USB / MHC-EC68USB Service Manual ▷ View online
HCD-EC68USB
HCD-EC68USB
29
29
36
18
1
19
B E
B E
B E
B E
B E
B
E
B
E
B E
B E
B E
B E
B E
B E
1
14
15
28
R601
R603
R604
R605
R609
R801
R802
R803
R804
R610
R805
R611
R806
R612
R807
R613
R808
R614
R809
R615
R616
R617
R618
R619
R810
R811
R812
R813
R814
R620
R815
R621
R816
R622
R817
R623
R818
R624
R819
R625
R626
R627
R628
R629
R820
R821
R822
R823
R824
R630
R825
R826
R827
R829
R637
D791
R639
R830
R831
R832
R640
R836
R837
R643
C607
R838
R644
C608
R839
R645
C609
R646
R647
R648
R649
C803
R840
C804
C610
C805
R841
C611
R842
C806
C612
C807
R843
R844
C808
R650
R845
C809
R651
R846
R652
R847
C617
C618
C619
C810
C811
C814
C815
C816
C817
R660
C819
R663
C629
R666
R667
C820
C821
R669
C824
C826
C827
C633
C828
R670
C634
C829
R672
R673
C637
C638
C638
C639
R676
R677
C830
R678
C831
C832
C834
C640
C835
C836
C642
C837
C838
R681
C645
C647
R684
C648
R685
C649
R686
R687
C840
C841
R689
C843
C844
C650
C845
C846
C652
C847
C848
R690
C654
R691
C655
R692
C656
R693
C657
C658
R696
R697
C850
D601
C662
D602
D604
D605
C666
D606
JR601
JR602
JR603
JR604
JR605
D801
JR606
D802
JR607
D803
JR608
D804
JR609
D805
D806
C674
D614
D617
JR610
D618
JR611
C679
JR612
JR613
JR614
JR615
JR616
JR617
JR618
C680
C681
D621
C682
D622
C683
C684
C685
C686
C687
D628
C689
C790
C690
D631
C691
C692
C693
C694
C695
C696
C699
R700
R704
R706
R707
R708
R709
R715
R716
R720
R722
R727
R728
R731
R732
C700
C703
C704
R749
C713
R750
R751
R752
R753
R754
TP619
R787
R788
R791
R792
Q602
Q603
Q604
Q605
Q606
Q608
Q801
Q802
TP657
Q611
Q612
Q618
Q619
Q622
C788
C789
TP690
R761
R762
R763
R760
R661
1
3
4
5
1
2
1
8
1
2
8
31
9
2
1
26
27
20
21
1
2
B
E
E
1
5
1
13
1
3
B
E
TB602
JW760
JW761
JW762
JW763
JW764
JW765
JW766
JW767
JW768
JW769
JW770
JW771
JW773
JW774
JW775
JW777
JW779
JW780
JW781
CN601
JW782
JW783
CN603
JW784
CN604
JW785
CN605
JW786
JW787
CN607
CN608
CN801
R638
C602
C601
R641
R642
C802
CN633
C613
C614
R658
X801
C620
C760
C761
C621
C622
C623
R662
C626
C627
C628
C822
C823
C630
C631
C632
C636
R674
R675
C833
C641
RY602
RY601,RY602
C644
C646
JW601
JW602
JW603
JW604
JW605
JW606
JW607
JW608
JW609
JW801
C661
JW802
JW803
C663
JW610
JW804
C664
JW611
C665
JW612
JW613
C667
D607
D608
D701
D704
JW615
C669
D609
JW616
JW617
JW618
JW619
D610
C671
D611 D612
JW620
JW621
ET601
C675
D615
ET602
JW622
C676
JW623
JW624
JW625
D619
JW626
JW627
JW628
JW629
D620
JW630
JW631
JW632
JW633
JW634
JW634
D629
JW635
JW636
JW637
JW638
JW639
D630
T801
JW640
JW641
JW647
JW649
JW650
JW651
JW652
JW653
JW654
JW655
JW656
JW657
JW658
JW659
JW660
JW661
JW662
JW663
JW664
JW665
JW666
JW667
JW668
JW669
JW670
JW672
JW673
JW674
JW675
JW676
JW677
JW678
JW679
JW680
JW681
CN613
JW682
JW683
JW684
JW685
JW686
R717
R718
JW689
R719
JW690
R724
R725
R726
JW697
JW699
C714
JW700
JW701
JW702
JW703
JW704
JW705
Q601
JW706
JW708
JW709
JW710
JW711
JW712
JW713
JW715
JW716
JW691
JW772
JW687
JW788
JW717
JW718
JW719
L603
L604
L701
JW720
JW721
JW722
JW723
JW724
L801
JW725
CF801
L802
JW726
L803
L804
JW728
Q624
L805
JW729
JW730
JW731
JW732
JW733
JW734
JW735
JW736
JW737
JW738
FL801
JW739
FL803
JW740
JW741
JW742
JW743
JW744
JW750
JW751 JW752
MAIN BOARD
1 24
5
IC602
IC801
IC701
D2
J2
REG
BOARD
W610
PT
BOARD
CN051
LOW AMP
BOARD
CN104
(CHASSIS)
G2
(CHASSIS)
ANTENNA
FM/AM
M601
(FAN)
(FAN)
M
L
R
SPEAKER
IMPEDANCE
USE 6
Ω
1-875-488-
14
(14)
C4
JACK
BOARD
USB BOARD
CN901
H2
LOW AMP
BOARD
CN102
L6
PANEL
BOARD
CN304
L4
PANEL
BOARD
CN304
M2
USB BOARD
CN907
1
3
A
B
C
D
E
F
G
H
I
1
2
3
4
5
6
7
8
9
10
(EXCEPT AEP)
(AEP)
L5
PANEL
BOARD
CN304
(SUFFIX-12)
(SUFFIX-13)
(SUFFIX-14)
C3
JACK
BOARD
R2
(SUFFIX-12/-13)
(SUFFIX-14)
(Page 33)
(Page 32)
(Page 32)
(Page 34)
(Page 38)
(Page 36)
(Page 35)
6-9. PRINTED WIRING BOARD - MAIN Board (Suffi x-14) -
•
: Uses unleaded solder.
• See page 23 for Circuit Boards Location.
Ref. No. Location
• Semiconductor
Location
D601
E-2
D602
E-6
D604
G-3
D605
D-5
D606
E-6
D607
G-5
D608
F-5
D609
G-5
D610
F-5
D611
H-6
D612
H-6
D614
B-6
D615
D-7
D617
D-6
D618
E-6
D619
E-6
D620
E-7
D621
D-5
D622
D-5
D628
D-7
D629
H-6
D630
H-6
D631
E-7
D701
F-7
D704
G-7
D791
E-5
D801
B-3
D802
A-4
D803
B-4
D804
B-3
D805
B-2
D806
A-2
IC602
B-7
IC701
F-7
IC801
C-4
Q601
D-4
Q602
D-5
Q603
D-5
Q604
G-3
Q605
D-6
Q606
D-5
Q608
B-6
Q611
D-5
Q612
D-6
Q618
D-7
Q619
G-6
Q622
E-6
Q624
E-7
Q801
B-5
Q802
B-5
(Page 26)
(Page 33)
(Page 26)
(Page 33)
Note: Refor to “SUFFIX-12/-13/-14 DISCRIMINATION OF PRINTED WIRING
BOARDS” (page 4) of the servicing notes for suffi x-12/-13/-14.
HCD-EC68USB
HCD-EC68USB
30
30
BOARD
CN102
LOW
H
AMP
AMP
G
LOW
CN104
BOARD
BOARD
PT
J
CN051
MAIN
(2/2)
BOARD
1
BOARD
REG
W610
D
C
JACK
BOARD
BOARD
USB
CN901
R
IC B/D
0
8.8
0.4
16.6
16.7
16.7
0
0.8
0.7
8.9
8.8
0
0
8.8
10.8
2.9
2.3
0
8.8
8.8
0
0
4.2
4.7
0
0.4
0.7
18
5.1
1
3.2
1
2
3
4
5
6
7
8
8P
CN604
RELAY ON/OFF
V STBY
AC DETECT
VH(AC)
VL(AC)
GND
VL(AC)
VH(AC)
100V
C621
0.1
100V
C623
0.1
1N5402-F46
D607
1N5402-F46
D608
1N5402-F46
D610
1N5402-F46
D609
25V
2200
C627
25V
1000
C628
MC2838-T112-1
D602
2SC3052F-T1-LF
Q606
2SC3052F-T1-LF
Q605
2SC3052F-T1-LF
Q604
R646
100
R652
100
R614
10k
R613
10k
R648
47k
R649
2.2k
L603
L604
10
R615
10
R612
10
R611
10
R647
0.1
C607
0.1
C617
0.1
C608
0.1
C618
MC2838-T112-1
D601
4.7k
R610
4.7k
R609
1
2
3
3P
CN601
VDD+
GND
VDD+
2SC3052F-T1-LF
Q602
2SC3052F-T1-LF
Q603
1N4002B
D615
2SC3052F-T1-LF
Q619
0.022
C642
56k
R686
10k
R677
10k
R676
16V
100
C631
2SC3052F-T1-LF
Q608
R667
47k
10V
47
C630
1k
R666
25V
47
C601
10V
100
C620
10k
R691
TP601
TP602
TP615
TP617
TP618
TP619
TP621
TP622
TP623
TP624
TP625
TP626
TP627
TP628
TP629
TP630
TP631
TP632
TP633
TP634
TP635
R622
33k
R617
10k
R623
10k
R624
10k
R618
10k
R625
33k
R616
∗
R619
R616, 619
3.9k (EXCEPT AEP)
15k (AEP)
15k (AEP)
∗
∗
15
R724
R725
15
KTA1266GR-AT
Q601
50V
4.7
C632
2.2k
R690
27k
R689
R630
47k
50V
4.7
C614
50V
10
C613
R626
10k
4.7k
R627
15
R726
JW750
1k
R644
R620
4.7k
R621
4.7k
C61
1
0.22
C612
0.22
100k
R639
100k
R640
MC2838-T112-1
D617
R629
4.7k
R601
470
R650
4.7k
R651
4.7k
R727
4.7k
R728
4.7k
47k
R678
1
C695
1
C696
47
R674
47
R675
100k
R729
C699
1000p
C700
1000p
MAZ8082GMLS0
D622
MAZ8043GMLS0
D621
2SC3052F-T1-LF
Q611
100k
R669
10k
R670
10k
R628
4.7k
R637
0.01
C619
4700p
C629
10k
R672
50V
3.3
C641
ISA1235AC1TP-1EF
Q612
ISA1235AC1TP-1EF
Q618
1
2
3
4
5
5P
CN633
PA-GND
OUT-R
+VH
-VH
OUT-L
1
2
3
4
5
6
7
8
9
CN605
9P
AUDIO-L
A-GND
AUDIO-R
HP-GND
HP-L
HP-R
AMP-ON
SP-RELAY
GND
1
2
3
4
5
5P
CN603
R603
4.7
1k
R693
4.7k
R692
R673
0
10k
R643
2.2k
R645
C622
C626
2200 50V
2200 50V
2W
470
R658
2W
470
R662
D604
MA2J1110GLS0
MA2J1110GLS0
D614
MA2J1110GLS0
D605
MA2J1110GLS0
D628
E
ET601
JW751
JW752
MC2836
D606
100k
R604
25V
22
C602
E
ET602
RY602
2A02M
D611
2A02M
D612
1k
R663
10V
47
C714
1N4002B
D629
1N4002B
D630
C609
4700p
C610
4700p
R638
R641
R642
R605
56
22k
R687
4.7k
R685
0
R760
MA2J1110GLS0
D631
100k
R791
220k
R792
MA2J1
110GLS0
D791
O-POWER
USB5V
-ON
HP-L
HP-R
AMP-R
AMP-L
SP-RELAY
AMP-ON
AUDIO-L
HP-R
HP-L
O-POWER
PROTECT
PROTECT
AMP-ON
SP-RELA
Y
I-P-MONI
PROTECT
CD-A
VR
AUDIO-R
VSTBY
1
2
3
CN613
3P
VBUS-5V
VBUS-GND
VBUS-5V (NC)
1
3
2
MAIN BOARD (1/2)
(CHASSIS)
(CHASSIS)
1
OUT
GND
3
IN
+
-
-
+
R
L
TB602
(FAN)
M
M601
PROTECT
DETECT
Q601, 602
FAN MOTOR DRIVE
STANDBY
SWITCH
PROTECT
DETECT
Q611, 612
RELAY DRIVE
(AEP)
(SUFFIX-12/-13)
(EXCEPT AEP)
Q605, 606
PROTECT DETECT
RELAY DRIVE
DC DETECT
68
68
68
USE 6
Ω
IMPEDANCE
SPEAKER
7
11
D
B
16
6
9
17
10
F
5
15
3
G
1
18
12
C
E
H
8
J
4
13
A
14
2
I
IN-R
A-GND
IN-L
AMP-ON
PROTECT
100uH
L701
16V
470
C761
25V
100
C760
4.7k
R761
33k
R762
1k
R763
RK36LF-A4
D701
1
2
3
4
5
IC BD9701CP-V5
IC701
VCC
OUT
GND
INV
STBY
JW788
JW772
RK36LF-A4
D704
IC701
+5V REGULATOR
(SUFFIX-12/-13)
(SUFFIX-14)
(Page 39)
(Page 33)
(Page 27)
(Page 32)
(Page 32)
6-10. SCHEMATIC DIAGRAM - MAIN Board (1/2) -
• See page 40 for IC Block Diagrams.
(Page 33)
(Page 31)
Note: Refor to “SUFFIX-12/-13/-14 DISCRIMINATION OF PRINTED WIRING
BOARDS” (page 4) of the servicing notes for suffi x-12/-13/-14.
HCD-EC68USB
HCD-EC68USB
31
31
(SUFFIX-12/-13)
(SUFFIX-14)
(SUFFIX-12/-13)
(SUFFIX-14)
PANEL
BOARD
CN304
L
USB
BOARD
CN907
M
MAIN
1
BOARD
(1/2)
21
IC B/D
IC B/D
2.9
1.2
1.4
0
2.9
0
2.2
0
1.7
0
2.3
1.6
2.3
1.8
0
1.8
3.6
3
3.7
2.2
4.2
2.2
4.8
4.8
4.7
4.8
4.7
4.7
2.4
2.2
0.9
2.2
AM FREQUENCY
FM TRACKING
COVERAGE
COVERAGE
FM FREQUENCY
AM TRACKING
FM DETECTOR
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
7.4
3.3
3.3
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
3.6
8.8
2.9
4.8
6.9
3.4
5.5
3.8
3.8
0
3.2
7.2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
21P
CN608
1N4002B
D619
1N4002B
D620
10V
220
C669
100
R722
1k
R716
2SC3052F-T1-LF
Q622
22k
R720
10V
470
C673
(SUFFIX-12/-13)
(SUFFIX-12/-13)
16V
100
C667
100
R715
50V
1
C663
50V
1
C664
220
R707
220
R706
50V
10
C661
50V
1
C676
50V
1
C675
1
C658
1
C656
1
C650
1
C648
2200p
C647
1k
R697
2200p
C657
1k
R709
50V
1
1
C644
50V
1
1
C636
50V
1
C646
50V
1
C665
TP637
TP639
TP641
TP642
TP643
TP644
TP645
TP646
TP647
TP648
TP649
TP651
TP652
TP654
TP656
TP657
TP658
TP659
TP660
TP661
TP662
TP663
TP664
TP665
TP666
TP667
TP668
TP669
TP670
4.7k
R700
4.7k
R704
10k
R696
10k
R708
C649
220p
0.1
C679
0.1
C691
0.1
C693
0.1
C694
2200p
C683
2200p
C690
470p
C689
0.01
C692
2200p
C680
2200p
C682
2200p
C681
100
R732
100
R731
MAZ8039GHLS0
D618
0.047
C638
0.047
C637
0.047
C634
0.047
C633
22k
R684
22k
R681
0.022
C674
5.6k
R751
5.6k
R753
4.7k
R749
4.7k
R750
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
27P
CN607
16V
C671
100
C838
1000p
C827 0.047
C820
5p
C816
0.01
4700p
4700p
22
R804
TP688
R841
10k
10V
220
C833
R809
100
R824
470
R831 2.2k
R810
4.7k
C822
22
50V
TP684
R811
100k
R823
10k
JW802
R844
2.2k
R845
0
R838
22k
22
R808
R830
3.3k
C815
R802
22
C837
10p
C824
1
C845
0.22
R819 33k
C817
0.01
R837
100k
C803
1
C847
0.1
R816 1k
C835 0.047
R829 4.7k
6
2
1
3
4
AM IF
T801
R820
4.7k
31
32
33
34
35
36
1
2
3
4
5
6
30
29
28
27
26
8
7
9
10
11
21
22
23
24
25
12
13
14
15
20
19
16
17
18
LV23003VA
IC801
AM RF-IN
REG
FM-MIX
GND1
AM-MIX
VCC1
AM IF-IN
FM IF-IN
P-DET
P-COMP
FM-DET
L-OUT
R-OUT
VSS
CE
DI
CL
DO
XIN
XOUT
VDD
MPX-IN
FM DET
-OUT
AM DET
-OUT
AGC
PD
LP-IN
LP-OUT
BO1
BO2
AM-OSC
FM-OSC
VCC2
FM RF-OUT
GND
FM RF-IN
R827 100k
R840
0
C819
470p
R812
47k
R821
4.7k
C841
1000p
C823
220
10V
R805
470k
16V
100
C802
C830
2p
TP687
1
6
2
3
4
5
L805
C831
0.47
R813
470k
CF
G
I
O
FL801
TP690
1
2
3
4
6
L801
C814
L803
C832
0.47
R842
0
TP686
L804
C848
0.1
R817
47k
R826
1k
R836
6.8k
C844
0.1
SV230-TB-E
D804
C808
18p
C828
100p
2SC3052F-T1-LF
Q801
R814
22k
R807
22k
R815
10k
R806
47k
R825
4.7k
R832 1M
C840
0.1
JW801
C826
1000p
BPF
G
G
I
O
FL803
C829 0.47
R839
10
C804
18p
CF801
C806
470p
R846
10
1
3
4
6
2
L802
TP689
TP683
TP685
C836 0.022
R818 10k
R843
100k
JW804
C805
0.47
SV230-TB-E
D803
2SC3052F-T1-LF
Q802
C846
0.01
C843
0.1
R801
100
C807
1
R803
2.2k
JW803
C821
2200p
C834
10p
R822
100
R847
0
1
2
3
3P
CN801
AM
GND
FM
X801 75MHz
SVC347A-TL-E
D801
R660 0
68
R717
68
R718
68
R719
KTC3203Y-AT
Q624
C645
1000p
C655
220p
C666
1000p
10p
C659
10p
C660
1000p
C662
0.1
C850
470p
C713
C809
1000p
C810
1000p
C81
1
1000p
28
27
26
25
24
23
22
7
6
5
4
3
2
1
21
20
16
17
18
19
13
12
11
10
8
9
15
14
BD3499FV-E2
IC602
TC/DMP-R
TC/DMP-L
TUNER-R
TUNER-L
CD-R
CD-L
AUDIO-R
AUDIO-L
SEL-L
SEL-R
VOL-R
VOL-L
TRE-L
TRE-R
BASSB-L
BASSA-L
BASSA-R
BASSB-R
OUT
-L
SB-L
SURR
SB-R
OUT
-R
VCC
SCLK
SDA
TA
GND
FIL
2200p
C640
2200p
C639
R788
15k
R787 15k
470p
C704
0.068
C684
0.068
C686
0.068
C685
0.068
C687
5.6k
R752
5.6k
R754
2200p
C703
0.015
C789
0.015
C788
1PS226-115
D802
1PS226-115
D805
1PS226-115
D806
CD-R
CD-L
AUDIO-L
AUDIO-R
CD-R
CD-L
TU-DO
TUNER-R
TUNER-L
I/O-BUS2
I/O-BUS0
TUNER-R
O-CD-M-MUTE
O-CD-BUCK
TU-CE
TU-CLK
TU-ANSD
TU-DO
I2C-DATA
I2C-CLK
O-POWER
O-CD-M-MUTE
AMP-ON
O-CD-SBSY
O-CD-REQ
O-CD-CCE
O-CD-BUCK
I/O-BUS2
I/O-BUS0
I-P-MONI
O-CD-ON
TU-ANSD
R661 0
DMP-DET/USB-RST
TU-DI
O-CD-SBSY
O-CD-CCE
I/O-BUS3
I/O-BUS1
O-CD-RST
O-CD-RST
I/O-BUS1
I/O-BUS3
O-CD-REQ
DMP-DET/USB-RST
TU-CE
TU-DI
TU-CLK
O-CD-ON
USB5V
-ON
I2
C
-D
ATA
I2C-CLK
AMP-R
AMP-L
TUNER-L
1
C654
1
C652
CD-A
VR
4700p
C790
VSTBY
1
3
2
MAIN BOARD (2/2)
I/O-I2C-DATA
I-TU-DO
I-TU-ANSD
O-TU-CLK
O-TU-DI
O-TU-CE
V-STBY
D-GND
O-CD-ON
I-P-MONI
O-CD-RST
I/O-BUS3
O-CD-BUCK
I/O-BUS0
O-CD-CCE
I/O-BUS1
O-CD-REQ
O-CD-SBSY
I/O-BUS2
O-AMP-ON
M-GND
O-CD-M-MUTE
I-DMP-DET/O-USB-RST
O-POWER
5V-ON/TP-REC-MUTE
I/O-I2C-CLK
O-SW-ON/I-TP-STATE
INPUT SELECTOR,
IC602
ELECTRICAL VOLUME
AM/FM DET, OSC,
IC801
MIX, PLL, IF AMP
+3.3V
REGULATOR
REGULATOR CONTROL
ANTENNA
FM/AM
+3V REGULATOR
+5V REGULATOR
7
11
D
B
6
9
10
F
5
15
L
K
3
G
1
12
C
E
H
8
J
4
13
A
14
2
I
USB-RST
M-MUTE
M-GND
VM+7V
DVDD
D-OUT
D-GND
SBSY
REQ
CCE
BUCK
BUS3
BUS2
BUS1
BUS0
RST
A-GND
L-OUT
DAC-GND
R-OUT
AVDD+3.3V
(Page 27)
(Page 37)
(Page
30)
6-11. SCHEMATIC DIAGRAM - MAIN Board (2/2) -
• See page 40 for waveforms. • See page 40 for IC Block Diagrams.
Note: Refor to “SUFFIX-12/-13/-14 DISCRIMINATION OF PRINTED WIRING
BOARDS” (page 4) of the servicing notes for suffi x-12/-13/-14.
HCD-EC68USB
HCD-EC68USB
32
32
B
E
B
E
Q101
Q102
R101
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
R114
R122
R123
R125
R126
R127
R128
R131
R132
R133
R134
R135 R136
C103
C104
C105
R142
C106
R145
C109
R146
C110
C116
C123
C124
C125
C126
C128
D101
D103
JR132
1
15
4 5
1
2
1
5
CN102
CN104
(SUFFIX-14)
(SUFFIX
-12/-13)
-12/-13)
(SUFFIX-14)
(SUFFIX
-12/-13)
-12/-13)
R129
R130
C101
C102
C107
C108
C119
C120
JW131
JW132
JW133
JW134
JW135
JW136
JW137
LOW AMP BOARD
IC101
G2
H1
MAIN
BOARD
CN603
MAIN
BOARD
CN633
H2
MAIN
BOARD
CN603
1-875-495-
12, 13, 14
(12, 13, 14)
A
B
1
2
3
4
G1
MAIN
BOARD
CN633
G
CN633
BOARD
(1/2)
MAIN
MAIN
(1/2)
CN603
BOARD
H
0
-36.8
0
0
-35.2
0
0
0
36.7
0
0
35.2
2
0
0
0
0
0
0
C116
4700p
50V
1
C101
50V
1
C102
220
R125
220
R127
220
R128
220
R126
2W
0.22
R129
2W
0.22
R130
2.2k
R135
2.2k
R136
2SA2026
Q101
2SA2026
Q102
MC2838-T112-1
D101
C106 100p
C105
100p
3p
C109
3p
C1
10
C120
100 50V
100 50V
C1
19
1k
R123
47k
R1
14
47k
R1
13
47k
R107
47k
R108
25V
47
C108
25V
47
C107
∗
R103
∗
R104
R105
4.7k
4.7k
R106
470p
C103
470p
C104
0.1
C128
1k
R109
1k
R1
10
0.1
C124
0.1
C123
0
R101
0
R102
22k
R133
22k
R134
1.2k
R132
1.2k
R131
R122
100
1
2
3
4
5
5P
CN104
PA-GND
OUT-R
+VH
-VH
OUT-L
TP101
TP102
TP103
TP104
TP105
TP107
TP108
TP109
TP110
TP111
470
R1
12
470
R
111
1
2
3
4
5
5P
CN102
PROTECT
AMP-ON
IN-L
A-GND
IN-R
MA2J1110GLS0
D103
0
R142
1
9
8
7
6
5
4
3
2
15
14
13
12
11
10
STK433-070 (AEP)
IC101
STK433-060 (EXCEPT AEP)
470
R145
470
R146
C126
0.1
C125
0.1
LOW AMP BOARD
IC101
POWER AMP
-PRE
-VCC
+VCC
LO+
LO-
RO+
RO-
+PRE
SUB
GND
LI-
LI+
ST
-BY
RI-
RI+
Q101,102
OVER LOAD DETECT
∗R103, 104
2.7k (AEP)
3.3k (EXCEPT AEP)
B
A
D
C
7
6
9
5
3
1
8
4
2
(Page 30)
(Page 29)
(Page 28)
6-12. PRINTED WIRING BOARD - LOW AMP Board -
•
: Uses unleaded solder.
• See page 23 for Circuit Boards Location.
(Page 28)
6-13. SCHEMATIC DIAGRAM - LOW AMP Board -
(Page 30)
(Page 29)
Note: Refor to “SUFFIX-12/-13/-14 DISCRIMINATION OF PRINTED WIRING
BOARDS” (page 4) of the servicing notes for suffi x-12/-13/-14.
Click on the first or last page to see other HCD-EC68USB / MHC-EC68USB service manuals if exist.