Adjustment Procedures; Tuner - Grundig UMS 100 Serviceanleitung

UMS 100

Adjustment Procedures

Tuner

Test equipment: Sweep / Signal Generator, Oscilloscope, Digital Voltmeter
Adjustment
1. AM IF AM;
Sweep Generator 450kHz to AM Aerial Input;
Ue > 60dBµV;
Oscilloscope via 100nF to Testpoint A.
2. AM Oscillator AM, 522kHz;
Digital Voltmeter to Testpoint B.
3. AM Band Pass AM;
Couple Signal Generator via Loop Antennas;
Ue > 50dBµV; f
Oscilloscope to Loudspreaker Output.
4. FM Demodulator FM;
Signal Generator with exact frequency to FM Aerial Input
(alternatively: Radio Station).
Digital Voltmeter between Testpoints D and E.
5. 19kHz Filter FM;
Signal Generator to FM Aerial Input;
Ue = 50dBµV; f
Oscilloscope to Loudspreaker Outputs.
f
g
GRUNDIG Service
Preparation
= 1kHz;
mod
= 19kHz;
mod
e
A
D E
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
Adjust with T105 a for Maximum.
Adjust with T103 b for 1.7V
Adjust alternating with T101 c at 603kHz and with
TC101 d at 1404kHz for AF Maximum.
Adjust with T106 e for 0V
Adjust with T107 g (left channel) and with T108 f (right
channel) for AF Minimum.
a
b
±
0.05V.
±
0.04V.
B
c
d
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