Tuner Board Eco5 - Marantz MR2020 Service Manual

TUNER BOARD ECO5

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