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TUNER ADJUSTMENT TABLE
Waverange
Input frequency
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
FM/MW-version, 9kHz grid
531 - 1602kHz
LW
153 - 279kHz
MW
FM/MW/LW- version, 9kHz grid
531 - 1602kHz
FM IF
10.7MHz, 50mV
FM
continuous wave
FM RF
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
VCO
FM
continuous wave
AM IF
MW
connect pin 6 of
IC 7101 (AM Osc.)
with short wire to
AM AFC
MW
3)
AM RF
4)
MW
FM/MW/LW- and FM/MW-version
( 9kHz grid)
531 - 1602kHz
LW
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
Use service test program. 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)
3)
For AM RF adjustments the original frame antenna has to be used !
Repeat
( ECO5 FM/MW- and FM/MW/LW - versions with AM-frame aerial )
Input
F
108MHz
A
mod=1kHz
87.5MHz
∆f=±22.5kHz
(65.81MHz)
98MHz, 1mV
A
C
450kHz
∆f=±15kHz
V
= 3mV
RF
ground (pin 4)
C
continuous wave
V
= 10mV
RF
1494kHz
B
558kHz
198kHz
1500kHz
∆f = ±30kHz
V
as low as
RF
560kHz
possible
7B-2
Tuned to
Adjust
108MHz
5130
87.5MHz
check
(65.81MHz)
1700kHz
5123
530kHz
check
1602kHz
5123
531kHz
check
279kHz
5122
153kHz
check
1602kHz
5123
531kHz
check
IC 7101
21
5119
shortcircuit
2141
to block AFC
108MHz
2155
87.5MHz
5131
(65.81MHz)
98MHz
3142
IC 7101
36
100nF
5111
IC 7101
40
100nF
5112
see
remark 2)
5114
2106
1494kHz
5102
558kHz
198kHz
5103
2106
1500kHz
5102
560kHz
2)
RC network serves for damping the IF-filter while adjusting the other one.
4)
MW has to be aligned before LW.
Output
Scope/Voltmeter
8V ±0.2V
4.3V ±0.5V
(1.2V ±0.5V)
8V ±0.2V
1.1V ±0.4V
6.9V ±0.2V
1
1.1V ±0.4V
8V ±0.2V
1.1V ±0.4V
8V ±0.2V
1.1V ±0.4V
0 ± 3 mV DC
2
4
MAX
152kHz ±1kHz
3
4
f
o
symmetric
0 ± 2 mV DC
2
4
f
o
symmetric
ECO5, discr. coil, 090797
1)
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