Adjustment Procedures - Grundig SCENOS UMS 4400 DVD Serviceanleitung

GRUNDIG Service

Adjustment Procedures

Tuner
Test equipment: Signal Generator, Oscilloscope, Digital Voltmeter
Adjustment
1. AM IF AM, 522kHz;
Couple Signal Generator 450kHz via Loop Antennas;
Ue > 60dBµV;
Oscilloscope to headphone output.
2. AM Oscillator AM, 1620kHz;
Digital Voltmeter to Pin 8 of U102.
3. AM Band Pass AM, 603kHz/1404kHz;
Couple Signal Generator via Loop Antennas;
Ue > 50dBµV; f
Oscilloscope to headphone output.
4. AM-AFC AM, 522kHz;
Couple Signal Generator 450kHz via Loop Antennas;
Digital Voltmeter between Pin 19 and Pin 20 of U102.
5. FM-Det. 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.
Preparation
= 1kHz;
mod
2 - 2
Adjustment Procedure
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.
SCENOS UMS 4400 DVD