Memorex MT1125A, Service Manual, Page: 30 / 38

A B C D E F G H
A B C D E F G H
2
1
3
4
5
6
7
8
2
1
3
4
5
6
7
8
TP701
TU_AUDIO_OUT
TP702
AUDIO_L
IC705
M62420SP
TONE CONTROL IC
1 10
11 12 13 14 15 16 17 18 19
2
20
3 4 5 6 7 8 9
IC701
AN582NS
STEREO IC
1 10 11 12
13 14 15 16 17 18 19
2
20 21 22 23 24
3 4 5 6 7 8 9
CP702B
IMSA-9130S-18L
1
10
11
12
13
14
15
16
17
18
2
3
4
5
6
7
8
9
C709_1
3.3
50V
KANP
C714_1
3.3
50V
KANP
AUDIO SIGNAL
Q704
2SA1037AK
BUFFER
Q703
2SA1037AK
BUFFER
L704
22uH
L702 100uH
L701
100uH
THE DC VOLTAGE AT EACH PART WAS MEASURED
WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST
WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL.
NOTE:
C780
47
16V
KA
C757
47
16V
KA
C740
4.7
50V
KA
C731
0.33
50V
KA
C708
4.7
50V
KA
C737
3.3
16V
TT
+-10%
C722
4.7
50V
KA
C725
10
16V
TT
+-10%
C730
4.7
50V
KA
C713
4.7
50V
KA
C715
4.7
50V
KA
C719
2.2
50V
KA
C729
4.7 50V KA
C716
4.7
50V
KA
C720
4.7
50V
KA
C732
4.7 50V KA
C752
100 10V YK
C778
0.033 B
C767
0.018
B
C771
0.022 B
C776
0.47 B
C781
0.001
B
C777
0.47 B
C770
0.022 B
C775
0.033 B
C782
0.022
F
C769
0.018
B
C701
220P
B
C702
220P
B
C762
0.1
F
C738
0.1
F
C743
0.1
F
C742
0.1
F
C735
0.022
B
C739 0.1
F
C727
0.1
F
C736
0.047
B
C765
2.2
50V
KA
C764
2.2
50V
KA
C761
47
16V
KA
C748
2.2 50V KA
C749
2.2 50V KA
R751
1.8K
R756
100K
R752
1.8K
R757
100
R755
100
R745
4.7K
R753
1K
R743
4.7K
R744
1K
R731
560
R729
560
R723
220K
R702
100 R701 100
R705
1.8M
R730
180K
R732 100K
R727 470 R725 180K
R726
100K
R722
470
OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE
NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME
D707
MTZJ6.8B
D708
MTZJ6.8B
SOUND_R
SOUND_L
STEREO SCHEMATIC DIAGRAM
TE9998
FROM/TO SOUND AMP
AUDIO_OUT_L
AUDIO_OUT_R
P.CON+9V
I2C_SCL
I2C_SDA
P.CON+5V
SOUND_L
SOUND_R
GND
GND
REAR_AUDIO_L
REAR_AUDIO_R
TU_AUDIO_OUT
FRONT_AUDIO_R
FRONT_AUDIO_L
GND
GND
P.CON+9V
4.4
NC
4.4
INTERFACE
I2C BUS
CONTROL
LOGIC
+
-
-
+
+
-
+
-
+
-
+
-
136K
136K
SIMAMP1
VOLAMP1
SIMAMP2
VOLAMP2
6.5K
6.5K
6.5K
VR4
1.8K
1.8K
S2
S1
VR3
VR5
S7
S4 S6
S3 S5
6.5K
TONE
AMP2
AMP1
TONE
S8
VR6
4.2 4.4 3.4 3.3 4.4
0
5.0
4.2 4.4 3.4 3.3
0
3.7 3.8
5.0
REF
REF
REF
VR2
VR1
8.9 4.2
4.2 4.4
Noise
Det
Spectral
RMS Det
SAP
Filter
Noise
Filter
Spectral
Filter
SAP
Det
Stereo
Filter
GND
Input
VCA
Pilot
Det St.PLL
Cancel
Pilot
Vcc
Spectral
Expand
dbx De-Emph
SAP
Demod
Wide Band
RMS Det
Wide Band
Filter
L+R Filter L+R Demod
IIC Decoder
L-R Demod L-R Filter
fH.2fH Trap Filter
OUT SW AGC
Matrix
Offset
Cancel
Offset
Cancel
Wide Band
Expand
ZAP DAC
(L-R)/SAP
Switch
De-Emph
75us
SAPout
Filter
0 2.3 2.2 0.4 5.1 2.4 2.4 0.4 2.3 3.4
3.7
2.6 3.6 3.7 0 5.0 5.0 0 2.3 2.3 2.3 2.3
2.3 2.3
0
0
3.2
3.2
3.8
3.8
30
31
PCB290
G-14 G-13