Tuner Board: Eco5 Sys - Philips FW-C250 Service Manual

7B-1
TUNER BOARD ECO5
TABLE OF CONTENTS
Blockdiagram ..................................................................7B-1
Adjustmant table .............................................................7B-2
Component layout ...........................................................7B-2
Circuit diagram ................................................................7B-3
Partslist ...........................................................................7B-4
7B-1
BLOCKDIAGRAM
TUNER BOARD
ECO 5
systems
FM-RF
V
1101
Loop
(1102)
A 3
FM
43 FM
frontend
FM-Osc.
5
V
Loop
AM-Osc.
6
AM-FRAME AERIAL V
Loop
1103
AM-RF
2
AM
Frontend
C
V
Loop
B 1
8 Charge
V
pump
Loop
38
V A
Stab
34
V B
Stab
23 7
Vdd Vcc1
buffer ampl.
V A V B
Stab Stab
Discriminator
5
LF filter
10,7 MHz 10,7 MHz 10,7 MHz
39 37 33
35 18 10 11
FM FM
IF1 IF2
Mixer Det.
RADIO IC
FM Pre-
Osc. scaler TEA 5757T
Multi-
plexer
AM
Osc.
AM IF AM
AM
Mixer Det.
AGC
AFC
22 40 41 36 44 32 19 20
Vcc2
450kHz 450kHz 450kHz
2
V A V B V B
Stab Stab Stab
7B-1
Vcc1
Vdd
RDS
Vcc2
(MPX)
VCO 1124
Vcc
4
4
right
9
15
right
4
14
Stereo left
left
1
Decoder
stereo
Version
24
3
1126 1121
stereo
4 6
clock
27 clock
data
28 data
enable
29 enable
CONTROL
1
RDS
(MPX)
1
31
P1
programmable
30
P0
output ports
Reference
MW/LW
Oscillator
25
AM-RF,
AM-Osc.
75kHz
ECO5 sys., 240698