Tuner/Stereo - Toshiba 27AFX54 Service Manual

A B
8
7
FROM CHROMA
P.CON+5V
TUNER+5V
P.CON+8V[B]
6
FROM POWER
GND
P.CON+B
5
FROM/TO MICON
AFT
SCL
SDA
J_AUDIO_OUT_L
J_AUDIO_OUT_R
4
TO SOUND
3
AUDIO_OUT_L
AUDIO_OUT_R
FROM/TO AV
TUNER_VIDEO
J_AUDIO_OUT_L
J_AUDIO_OUT_R
EXT_AUDIO_R
EXT_AUDIO_L
2
1
NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME
OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE
A B
G-11
C D
TUNER/STEREO SCHEMATIC DIAGRAM
3.2
C901
2.3
BUFFER
Q901
50V 1 KA
KTA1504S_Y_RTK 0
3.2
C902
2.3
BUFFER
Q902
50V 1 KA
KTA1504S_Y_RTK 0
NOTE: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.
C D
E F
(MAIN PCB)
TU001
115-V-K015AR_B
19
18
NC NC NC NC NC
NC
W809
NC
2.3 2.3 2.3 2.3 0 5.0 5.0 0 3.7 3.6 2.6 3.7
24 23 22 21 20 19 18 17 16 15 14 13
GND
Det VCA Det
OUT SW DAC ZAP IIC Decoder St.PLL
AGC
Pilot Input SAP
Cancel
Switch L-R Filter L-R Demod
Matrix
De-Emph (L-R)/SAP Pilot
Filter Filter Filter
75us L+R Filter L+R Demod
Stereo Noise SAP
Filter
Cancel
SAPout Demod
Offset fH.2fH Trap Filter Filter Filter
SAP
Wide Band Spectral
Expand
Cancel
Wide Band
RMS Det Expand RMS Det Det
Offset dbx De-Emph
Wide Band Spectral Spectral Noise
2.3
Vcc
1 2 3 4 5 6 7 8 9 10 11 12
0 2.3 2.3 2.2 2.2 0.4 5.1 2.4 2.4 0.4 2.3 3.4
NC NC
CAUTION
ATTENTION
:LES PIECES REPAREES PAR UN ETANT
DANGEREUSES AN POINT DE VUE SECURITE
N'UTILISER QUE CELLS DECRITES
DANS LA NOMENCLATURE DES PIECES
E F
G
20
21
NC NC NC
NC
L901
22uH 0305
:SINCE THESE PARTS MARKED BY ARE
CRITICAL FOR SAFETY,USE ONES
DESCRIBED IN PARTS LIST ONLY
G
H
8
7
6
5
4
3
2
PCB010
TMC566
1
H
G-12