Philips MCM298/37, Service Manual

Page: 23 / 37

7A-1 7A-1
1
FM
Osc.
FM
Mixer
AM
Mixer
AM
Osc.
AM IF
IF1 IF2
FM
Det.
AM
Det.
3 39 37 33
RADIO IC
TEA 5757H
TUNER BOARD
ECO 6
Systems
10 18 11
14
15
24
right right
left
left
stereo
VCO
41 40 36 19 32 44 25
Stereo
Decoder
AFC
AFC + AFC -
4
4
AGC
Pre-
scaler
Multi-
plexer
Charge
pump
Stabilizer
CONTROL
Reference
Oscillator
29
28
27 clock
data
enable
P1
P0
31
30
programmable
output ports
V
Loop
V
Loop
V
Loop
V
Loop
V
Loop
2
6
5
43
C
D
450kHz 450kHz 450kHz
20
75kHz
V
Stab
A V
Stab
B V
Stab
B
V
Stab
A V
Stab
B
10,7 MHz 10,7 MHz
35 9
Vdd Vcc1
7 23
V
Stab
A
V
Stab
B
38
34
22
Vcc2
8
ECO6 Systems, 140499
LF filter
RDS
(MPX)
RDS
(MPX)
stereo
clock
data
enable
Version
1120
1
8
FM
Frontend
AM
Frontend
AM-FRAME AERIAL
B
1103
1101
(1102)
A
FM
MPX
buffer ampl.
5
Discriminator
10,7 MHz
Vdd
Vcc1
Vcc
Vcc2
AM-RF
AM-Osc.
FM-Osc.
FM-RF FM-IF 1 FM-IF 2
AM-IF 1 AM-IF 2 AM-AFC
3
2
BLOCK DIAGRAM
ECO6 Tuner Board
version:
SYSTEMS non-CENELEC
TABLE OF CONTENTS
Blockdiagram ..................................................................7A-1
Schematic Diagram .........................................................7A-2
Component Layout ..........................................................7A-3
Adjustment table .............................................................7A-3
Electrical Partslist ............................................................7A-4