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GRUNDIG Service
VARIXX UMS 4401 SPCD
Adjustment Procedures
Tuner
Test equipment: Signal Generator, Oscilloscope, Digital Voltmeter Adjustment 1. AM IF Preparation AM, 522kHz; Couple Signal Generator 450kHz via Loop Antenna; Ue > 60dBµV; Oscilloscope to Loudspeaker Output. AM, 1620kHz; Digital Voltmeter to Pin 8 of IC101. AM, 603kHz/1404kHz; Couple Signal Generator via Loop Antenna; Ue > 50dBµV; fmod = 1kHz; Oscilloscope to Loudspeaker Output. Adjustment Procedure Adjust with T105 and T104 for Maximum.
2. AM Oscillator
Adjust with T102 for 7.8V ± 0.2V.
3. AM Band Pass
Adjust alternating with T101 at 603kHz and with T108 at 1404kHz for AF Maximum.
4. AM-AFC
AM, 522kHz; Adjust with T106 for 0V ± 1mV. Couple Signal Generator 450kHz via Loop Antenna; Digital Voltmeter between Pin 19 and Pin 20 of IC101. FM, 87.5MHz; Adjust with T103 for 0V ± 1mV. Signal Generator to FM Aerial Input; Short circuit Pin 21 of U102 to GND; Digital Voltmeter between Pin 19 and Pin 20 of IC101. FM, 87.5MHz; Signal Generator to FM Aerial Input; fmod= 19kHz; Oscilloscope to Loudspeaker Output. Adjust with IFT181 (left channel) and IFT182 (right channel) to Minimum.
5. FM-Det.
6. 19kHz Notch Filter
Tape Deck
Test equipment: Oscilloscope, Frequency Counter, Test Cassette 3150Hz/10kHz (e.g. 448A) Adjustment 1. Tape Speed Preparation Frequency Counter to Loudspeaker Output. Play Test Cassette (3150Hz part). Adjustment Procedure Adjust Motorpoti for 3150Hz ± 10Hz.
Motorpoti
2. Azimuth
Oszilloscope to Loudspeaker Output. Play Test Cassette (10kHz part).
With Head screw A adjust for maximal and equal level in both channels.
A
3. Bias Frequency Frequency Counter to CN105-RR/LR. Start recording.
2-2
Adjust with T201 for 60kHz ± 100Hz.
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