Memorex MT2252 Service Manual page 22

A B
8
FROM/TO MICON/TUNER
SCL
SDA
AUDIO_MUTE
7
6
5
4
FROM POWER
SOUND+B
GND
SOUND_GND
3
FROM CHROMA
TU_AUDIO_OUT
STEREO+5V
2
FROM DEFLECTION/CRT
+12V
1
NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME
OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE
A B
G-9
C D
SOUND SCHEMATIC DIAGRAM
(MAIN PCB)
NC NC
NC
2.3 2.3 2.3 2.3 0 5.0
24 23 22 21 20 19
OUT SW DAC ZAP IIC Decoder
AGC
Switch L-R Filter
Matrix
De-Emph (L-R)/SAP
75us
L+R Filter
Filter
Cancel
SAPout
Offset fH.2fH Trap Filter
Expand
Cancel
Wide Band
RMS Det
Offset
Wide Band
1 2 3 4 5 6
0 2.3 2.3 2.3 2.2 2.2 0.4
NC NC
R363
W829 1K 1/4W
W825
2.9
0
R354 2SC2412K
0
4.7K 1/4W
NOTE: THE DC VOLTAGE AT EACH PART WAS MEASURED CAUTION:
WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST
WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL.
C D
E
25
9V REG. IC
IC853
KIA78L09BP-AT
IN GND OUT
3 2 1
26
13.5 0 9.0
R859
4.7K
27
5.0 0 3.7 3.6 2.6
3.7
18 17 16 15 14 13
GND
Det VCA Det
St.PLL
Pilot Input SAP
L-R Demod Cancel
Pilot
Filter Filter Filter
L+R Demod Stereo Noise SAP
Demod
Filter Filter
SAP
Wide Band Spectral
Expand RMS Det Det
dbx De-Emph
Spectral Spectral Noise
Vcc R858 C871
7 8 9 10 11 12
5.1 2.4 2.4 0.4 2.3 3.4 18K
50V 2.2 KA
SOUND_R
SOUND_L
28 31
SOUND AMP IC IC351 LA4600
ATT.
RIPPLE
FILTER
OUTPUT GND
VCC P.P STAND-BY INPUT GND
1 2 3 4 5 6 7 8 9
8.1 0 8.1 12.1 6.0 8.9 0.9 1.4 0
C358
R360
50V 0.1 KA 1K 1/4W
R357
W805
1.8K
HS351
763WAA0131
W834
MUTE SW.
Q351 MUTE SW.
2.9
Q352
0
2SC2412K
0
W839
SINCE THESE PARTS MARKED BY ARE ATTENTION: LES PIECES REPAREES PAR UN
CRITICAL FOR SAFETY,USE ONES DANGEREUSES AN POINT DE VUE SECURITE
DESCRIBED IN PARTS LIST ONLY N'UTILISER QUE CELLS DECRITES
DANS LA NOMENCLATURE DES PIECES
E
F G
R864 C881
29
1.8K 0.033 B
C879 C883
0.022 0.47
B B
1 2 3 4 5 6 7 8 9 10
1.8K VR3 VR5
TONE
136K
+ AMP1 I2C BUS
REF
-
INTERFACE
VR1 +
-
SIMAMP1
+
-
REF VOLAMP1 6.5K
6.5K
6.5K
VOLAMP2
REF +
- - CONTROL
SIMAMP2
+
6.5K
LOGIC
VR2
-
+ TONE
136K
AMP2
1.8K VR4
VR6
20 19 18 17 16 15 14 13 12 11
C880 C882
0.022 B 0.47 B
R863 C884
1.8K 0.033 B
R861 R866
30
1K 100K
10
1.4
SPEAKER
CP351
33 TID-X04P-Z1
SP_OUT_L+ 1 1
8OHM 2.5Wx2
SP_OUT_L- 2 2
W841
SPEAKER
SP_OUT_R- 3 3 SO407F01-B
SP_OUT_R+ 4 4
32
W828
AUDIO SIGNAL
ETANT
F G
H
8
7
6
5
4
3
SP351
2
PCB010
TMX458
1
H
G-10