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EN 138
8.
EM6E AB
8.2.5
FM Radio Module Alignments
TUNER ADJUSTMENT TABLE
Waverange
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(50kHz grid)
MW
531 - 1602kHz
(9kHz grid)
LW
153 - 279kHz
(3kHz grid)
FM - IF
FM
FM - VCO
FM
FM RF (channel separation)
FM
AM IF
MW
AM AFC
MW
3)
AM RF
MW
LW
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
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!
MW has to be aligned before LW.
Repeat
Electrical Alignments
( ECO6 Cenelec FM/MW - and FM/MW/LW - versions with AM-frame aerial )
Input frequency
Input
10.7MHz, 45mV
D
continuous wave
98MHz, 1mV
A
continuous wave
Note: The FM-frontend unit has already been adjusted by the factory
and needs therefore no further adjustments for service purposes.
98MHz, 1mV
A
90% Left + 9% pilot
mod=1kHz
C
∆f = ±10kHz
450kHz
V
= 0.5mV
RF
(as low as
connect pin 6 of
possible)
IC 7101 (AM Osc.)
with 3.3k to Vcc
C
continuous wave
V
= 2mV
RF
1494kHz
B
558kHz
∆f = ±30kHz
V
as low as
198kHz
RF
possible
Figure 8-8 Tuner adjustment table
Tuned to
Adjust
108MHz
check
87.5MHz
check
1602kHz
5123
531kHz
check
279kHz
5122
153kHz
check
IC 7101
21
5119
shortcircuit
2141
to block AFC
98MHz
3142
IF coil
inside
98MHz
FM frontend
1110
IC 7101
36
100nF
5111
IC 7101
40
100nF
5112
see
remark 2)
5114
1494kHz
2106
558kHz
5102
198kHz
5103
Output
Scope/Voltmeter
8V ±1.2V
1.6V ±0.5V
8V ±0.2V
3-band
6.9V ±0.2V
2-band
1
1.1V ±0.4V
8V ±0.2V
1.1V ±0.4V
0mV ±3mV
2
152kHz ±1kHz
1)
3
4
right channel min.
5
f
o
symmetric
0mV ±2mV
2
5
f
o
symmetric
ECO6 Sys Cenelec, 190599
CL 36532049_004.eps
060603
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