Grundig Scenos UMS 4400 DVD, Service Manual

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GRUNDIG Service SCENOS UMS 4400 DVD
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Adjustment Procedures
Tuner
Test equipment: Signal Generator, Oscilloscope, Digital Voltmeter
Adjustment Preparation Adjustment Procedure
1. AM IF
2. AM Oscillator
3. AM Band Pass
4. AM-AFC
5. FM-Det.
AM, 522kHz;
Couple Signal Generator 450kHz via Loop Antennas;
Ue > 60dB
µ
V;
Oscilloscope to headphone output.
AM, 1620kHz;
Digital Voltmeter to Pin 8 of U102.
AM, 603kHz/1404kHz;
Couple Signal Generator via Loop Antennas;
Ue > 50dB
µ
V; f
mod
= 1kHz;
Oscilloscope to headphone output.
AM, 522kHz;
Couple Signal Generator 450kHz via Loop Antennas;
Digital Voltmeter between Pin 19 and Pin 20 of U102.
FM, 98.0MHz
Signal Generator to FM Aerial Input;
Short circuit Pin 21 of U102 to GND;
Digital Voltmeter between Pin 19 and Pin 20 of U102.
Adjust with T101 and T103 for Maximum.
Adjust with T106 for 1.1V
±
0.2V.
Adjust alternating with T104 at 603kHz and with CT101 at
1404kHz for AF Maximum.
Adjust with T102 for 0V
±
1mV.
Adjust with T105 for 0V
±
1mV.