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It´s very very nice manual with all, what i need. Original in good quality. Very fast business. Very much thanks...
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A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
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Quality scan of the original. All the detail necessary to troubleshoot, repair and adjust the unit. I'm sure I will be downloading more manuals in the future as the need arises.
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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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