CENELEC TUNER PORTION - COMPONENT & CHIP LAYOUTS
11-10
11-10
98MHz
Waverange
Input frequency
Input
Tuned to
Adjust
Output
Scope/Voltmeter
VARICAP ALIGNMENT
FM - VCO
FM RF (channel separation)
AM IF
AM RF
3)
108MHz
87.5MHz
check
check
8V
±
1.2V
1.6V
±
0.5V
8V
±
0.2V
6.9V
±
0.2V
1.1V
±
0.4V
152kHz
±
1kHz
1)
98MHz
3142
198kHz
198kHz
5103
5111
FM
87.5 - 108MHz
(50kHz grid)
1602kHz
531kHz
5123
check
MW
531 - 1602kHz
(9kHz grid)
8V
±
0.2V
1.1V
±
0.4V
279kHz
153kHz
5122
check
LW
153 - 279kHz
(3kHz grid)
FM
FM
LW
558kHz
558kHz
1494kHz
5102
1494kHz
2106
MW
MW
98MHz, 1mV
continuous wave
98MHz, 1mV
90% Left + 9% pilot
mod=1kHz
IF coil
inside
FM frontend
1110
1
3
5
5
A
FM - IF
0mV
±
3mV
5119
FM
10.7MHz, 45mV
continuous wave
2
D
right channel min.
4
A
0mV
±
2mV
5114
2
C
Repeat
C
5112
1)
If sensitivity of frequency counter is too low adjust to max. channel separation
(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)
2)
RC network serves for damping the IF-filter while adjusting the other one.
3)
For AM RF adjustments the original frame antenna has to be used!
TUNER ADJUSTMENT TABLE
(
ECO6 Cenelec
FM/MW - and FM/MW/LW - versions with AM-frame aerial )
max.
symmetric
f
o
max.
symmetric
f
o
ECO6 Sys Cenelec, 190599
B
∆
f =
±
30kHz
V
RF
as low as
possible
MW has to be aligned before LW.
3-band
2-band
Note: The FM-frontend unit has already been adjusted by the factory
and needs therefore no further adjustments for service purposes.
2141
shortcircuit
to block AFC
21
IC 7101
see
remark 2)
220R
100nF
36
IC 7101
220R
100nF
40
IC 7101
450kHz
connect pin 6 of
IC 7101 (AM Osc.)
with 3.3k
Ω
to Vcc
AM AFC
MW
continuous wave
V
RF
= 2mV
∆
f =
±
10kHz
V
RF
= 0.5mV
(as low as
possible)
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
B
AM FRAME
AERIAL
A
This assembly drawing shows a summary of all possible versions. For components
used in a specific version see schematic and respective parts list.
3139 118 3462pt1 / 3463pt1 ...90280 dd wk149
3
A
D
C
4
1
2
5
This assembly drawing shows a summary of all possible versions.
For components used in a specific version see schematic and
respective parts list.
3139 118 3462pt1 / 3463pt1 ...90280 dd wk149