
**IMPORTANT SAFETY NOTICE.
IMPORTANT FOR SAFETY. WHEN REPLACING ANY OF THESE COMPONENTS,
USE ONLY MANUFACTURER'S SPECIFIED PARTS.
COMPONENTS IDENTIFIED BY MARK HAVE SPECIAL CHARACTERISTICS
WITH THE IMPROVEMENT OF PERFORMANCE.
**THIS SCHEMATIC DIAGRAM MAY BE MODIFIED AT ANYTIME
1pF = 10 uF
**THE UNIT OF CAPACITANCE IS MICROFARAD (uF).
K=1000 OHM, M=1000 KOHM
**THE UNIT OF RESISTANCE IS OHM.
6
-
3.H/P_R
1.H/P_L
TO FRONT BOARD
THERMAL
DC & POWER PROTECT
POSISTOR
FROM TRANS
2.P_GND
FROM GUIDE BOARD
SR
SL
CNT
FR
FL
BSR
BSL
2.P_GND
1.AC1
3.AC2
OVER PROTECT
28.PREOUT_FR
29.S_GND
30.PREOUT_FL
27.S_GND
26.PREOUT_CNT
25.S_GND
24.PREOUT_SW
21.S_GND
22.PREOUT_SL
23.S_GND
20.PREOUT_SR
19.S_GND
18.PREOUT_BSL
17.S_GND
16.PREOUT_BSR
SR
SL
CNT
FR
R
S
B
L
F
BSL
SW
7.1CH PREOUT
13.S_GND
14.MULTI_PRE_L
15.S_GND
12.MULTI_PRE_R
11.NC
10.FAN_DETECT
7.S_SPK_ON
8.F_SPK_ON
9._PROTECTION_IN
6.BS_SPK_ON
5.HP_RY_ON
4.N.C
3.N.C
2.-12V
SIGNAL DETECT
1.+12V
PROTECT (113'C)
FROM TRANS
TO INPUT
1.AC1
3.AC2
2.AGND
4.AC3
5.AC4
ZONE2_R
ZONE2_L
NOT USE
*NOT USE*
R8841
10K
D8822
1SS133M
R8844
1.5K
Q8808
KTC3199Y
R8843
22K
R8842
22K
R8723
2.2K
C8700
0.1uF
R8816
15K
R8817
15K
R8818
15K
R8707
22K
C8809
0.1uF
C8807
0.1uF
12
3
BN878
CWB030B50-S
C8811
0.1u/250V
C8810
0.1u/250V
2
4
3
1
D8806
GBJ1506
Q8804
KRC107M
D8804
1N4003SR
Q8803
KRC107M
Q8800
KRC107M
Q8801
KRC107M
Q8802
KRC107M
R8709
47K
Q8708
KRC102M
Q8705
KTA1267Y
Q8706
KTC3198Y
D8803
1N4003SR
D8800
1N4003SR
D8801
1N4003SR
D8802
1N4003SR
R8730
68K
R8728
68K
R8729
68K
R8727
68K
R8726
68K
R8725
68K
R8724
68K
C8815
12000/63V
C8814
12000/63V
Q8709
KTA1268
1
2
TH870
OPEN
Q8707
KTC3198Y
Q8710
OPEN
R8706
33K
C8701
100/50V
R8712
OPEN
R8713
OPEN
R8711
OPEN
R8714
OPEN
D8704
OPEN
C8702
1/50V
R8710
10K
GND81
6
1
5
4
2
3
RY881
CSL3A018ZE
6
1
5
4
2
3
RY880
CSL3A018ZE
6
1
5
4
2
3
RY883
CSL3A018ZE
6
1
5
4
2
3
RY882
CSL3A018ZE
6
1
5
4
2
3
RY884
CSL3A018ZE
R8808
470/1W
R8807
470/1W
R8804
10
C8804
0.047u
R8803
10
C8803
0.047u
R8802
10
C8802
0.047u
R8801
10
C8801
0.047u
R8800
10
C8800
0.047u
R8806
10
C8806
0.047u
R8805
10
C8805
0.047u
R8819
0.1 5W
R8820
0.1 5W
R8821
JUMPER
R8822
1.8K
R8823
560K
Q8806
KTA1268GR
Q8807
KTA1268GR
R8824
JUMPER
C8715
220P
R8749
470
R8750
470
C8716
220P
C8717
220P
R8751
470
R8752
470
C8718
220P
C8719
220P
R8753
470
R8754
470
C8720
220P
C8721
220P
R8755
470
R8756
470
C8722
220P
1
3
4
6
7
2
5
JK805
CJJ4P019W
D8719
1SS133M
D8718
1SS133M
C8726
0.1uF
D8717
1SS133M
D8716
1SS133M
C8725
0.1uF
D8706
1SS133M
D8707
1SS133M
C8704
10/50V
C8703
100/35V
R8720
1K
R8719
330K
Q8712
KRC111M
R8718
47K
Q8711
KRC107M
D8705
5.1V
R8722
22K
R8721
22K
Q8814
KRA107M
29
30
27
28
17
18
19
20
21
22
24
23
25
6
1
6
2
15
13
14
12
11
10
9
8
7
6
5
3
4
1
2
CN872
CJP30GA221ZB
Q8810
KRA107M
Q8811
KRA107M
Q8812
KRA107M
Q8813
KRA107M
Q8809
KRA107M
R8775
22K
C8712
N.C
C8705
0.01uF
GND2
GND1
R8829
15K
R8828
15K
R8827
15K
R8748
4.7
R8747
4.7
R8825
JUMPER
C8816
22/50V
C8844
N.C
C8813
OPEN
C8812
OPEN
543
21
CN811
D8811
1N4003
D8812
1N4003S
C8821
0.01uF/50V
C8822
0.01uF/50V
C8823
0.15uF
R8811
0.15/1W
R8812
0.15/1W
D8813
1N4003S
D8814
1N4003S
C8826
0.1uF
C8827
0.1uF
C8824
4700/25V
C8825
2200/25V
F8001
T 5A L 250V
C8830
0.15uF
C8831
OPEN
C8832
OPEN
C8833
4700uF/25V
C8834
10000uF/25V
C8835
0.1uF
JK804
C8723
220P
R8758
470
C8724
220P
R8757
470
2
4
3
1
D8821
GBJ1006
GND3
7
6
5
4
3
2
1
BN881
GND85
9
8
7
6
5
4
3
2
1
BN891
9
8
7
6
5
4
3
2
1
CN891
F8002
T 5A L 250V
3
2
1
CN877
10
9
8
7
6
5
4
3
2
1
-
+
-
+
+
-
-
+
JK803
C8808
0.1uF
D8711
Z12V
D8712
Z12V
2
1
JK800
4
3
2
1
JK801
B+
-12V
OVER
+12V
B-
POWER_PROTECTION
POWER_PROTECTION
-12V
-12V
-12V
-12V
B+
MUTE_P
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
CH_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
S_GND
FR
FL
S_GND
S_GND
S_GND
S_GND
BS_SPK_ON
S_SPK_ON
F_SPK_ON
+12V
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
B+
+12V
P_GND
P_GND
P_GND
P_GND
P_GND
SIGNAL_CHK
CLIPPING_ON
+12V
PROTECTION_IN
S_GND
S_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
+12V
-12V
POWER_PROTECTION
-12V
+12V
HP_RY_ON
SL
SR
CNT
FL
FR
BSL
BSR
+12V
-12V
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
P_GND
FR
FL
CNT
SR
SL
BSR
BSL
HP_RY_ON
BS_SPK_ON
S_SPK_ON
F_SPK_ON
PROTECTION_IN
P_GND
P_GND
PREOUT_FL
PREOUT_FR
PREOUT_CNT
PREOUT_SW
PREOUT_SL
PREOUT_SR
PREOUT_BSL
PREOUT_BSR
PREOUT_BSR
PREOUT_BSL
PREOUT_SW
PREOUT_CNT
PREOUT_SR
PREOUT_SL
PREOUT_FR
PREOUT_FL
S_GND
MULTI_PRE_R
MULTI_PRE_L
MULTI_PRE_L
MULTI_PRE_R
P_GND
P_GND
P_GND
P_GND
S_GND
SCHEMATIC DIAGRAM ( MAIN PART )
2-54
2-55
Summary of Contents for T 748
Page 1: ...L A U N A M E C I V R E S AV Surround Sound Receiver T748 AV Surround Sound Receiver T748 ...
Page 6: ...DISASSEMBLY REMOVAL OF FRONT PANEL 1 6 ...
Page 7: ...PRINCIPAL PART LOCATION 1 7 ...
Page 18: ...IC 211 MX29LV32DTTI 70G FLASH OF DSP 2 6 ...
Page 19: ...2 7 ...
Page 29: ...2 17 BLOCK DIAGRAM ...
Page 40: ...IC 913 IC 918 TC74VCX541FT OCTAL BUS BUFFER 2 28 ...
Page 44: ...BLOCK DIAGRAM MCU DSP PART 2 32 2 33 ...
Page 45: ...BLOCK DIAGRAM AUDIO PART 2 34 2 35 ...
Page 46: ...BLOCK DIAGRAM HDMI PART 2 36 2 37 ...
Page 62: ...2 68 2 69 PRINTED CIRCUIT BOARD FRONT TOP VIEW ...
Page 63: ...2 70 2 71 FRONT BOTTOM VIEW ...
Page 64: ...2 72 2 73 INPUT TOP VIEW ...
Page 65: ...2 74 2 75 INPUT BOTTOM VIEW ...
Page 66: ...2 76 2 77 MAIN TOP VIEW ...
Page 67: ...2 78 2 79 MAIN BOTTOM VIEW ...
Page 68: ...2 80 2 81 SUB TOP VIEW ...
Page 69: ...2 82 2 83 SUB BOTTOM VIEW ...