Grundig GLM0150, Руководство по обслуживанию

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