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MS 4101
Adjustment Procedures
Tuner
Test equipment: Sweep / Signal Generator, Oscilloscope, Digital Voltmeter
Note: The frontend is a completely preadjusted module. Only the IF filter must be adjusted to the IF amplifier (para 7).
Adjustment
1. MW Oscillator
MW, 522kHz
Digital Voltmeter to Testpoint
2. LW Oscillator
LW, 144kHz
Digital Voltmeter to Testpoint
3. AM IF
AM;
Signal Generator 450kHz to AM Aerial Input;
Ue = 50dBµV; f
Oscilloscope to Loudspeaker Output.
4. MW Band Pass
AM;
Couple Signal Generator via Loop Antennas;
Ue > 50dBµV; f
Oscilloscope to Loudspeaker Output.
5. LW Band Pass
AM;
Couple Signal Generator via Loop Antennas;
Ue > 50dBµV; f
Oscilloscope to Loudspeaker Output.
6. FM Demodulator
FM;
Signal Generator with exact frequency to FM Aerial Input
(alternatively: Radio Station).
Digital Voltmeter between Testpoints
C
and
7. FM IF
FM, 98MHz;
Sweep Generator to FM Aerial Input;
Ue = 50dBµV;
8. FM Search Stop
FM, 98MHz;
Signal Generator to FM Aerial Input;
Ue = 28dBµV;
9. 19kHz Filter
FM;
Signal Generator to FM Aerial Input;
Ue = 50dBµV; f
Oscilloscope to Loudspreaker Outputs.
GRUNDIG Service
Preparation
A
(JW9).
A
(JW9).
= 1kHz;
mod
= 1kHz;
mod
= 1kHz;
mod
(IC01-(28)).
= 19kHz;
mod
Adjust with MO
Check at 1611kHz for < 7V.
Adjust with LO
Check at 290kHz for < 7V.
Adjust with AM IF
Adjust with MA
Adjust with LA
Adjust with FM-DET
B
(IC01-(23))
g
Adjust
to maximum and symmetry.
Adjust SVR1
appears.
Adjust with B.P.F
(right channel) for AF Minimum.
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
±
a
for 1.2V
0.1V.
±
b
for 2.0V
0.1V.
c
for AF Maximum.
d
at 594kHz for AF Maximum.
e
at 150kHz for AF Maximum.
±
f
for 0V
0.05V.
h
so that "TUNED" in the display just
i
(left channel) and with B.P.F
j
2 - 3
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