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Summary of Contents for Albrecht AE 497 W
- Page 17 Service Information Sheet- February 9, 2005 AE 497 W Problem: In some cases users report about not 100 % stable VCO frequency. The problem can be recognised by unstable zero beat tones or not 100 % clear SSB modulation in receive and transmit mode.
- Page 18 Service Information Sheet- January 13, 2005 AE 497 W Problem: In some cases the internal 13.2 V power supply can become defective. Reason: A capacitor (C 701), which normally should smooth the internal voltage during power up, can under certain circumstances cause a negative pulse to transistor Q 701, when users disconnect the radio from the 230 V power by pulling the cable out of the 230 V outlet, while the radio is still switched on.
- Page 19 Circuit details: Q 701, C 701 and additional protection diode 1 N 4148 or similar. Schaltbildauszug: Q 701, C 701 und die zusätzliche Schutzdiode 1 N 4148 o. ähnlich (weitere Unterlagen sind unter www.hobbyradio.de/Amateurfunk) herunterzuladen The Photo shows the best mounting point for the protection diode. The position of the eventually defective transistor Q 701 is hidden on the photo just behind the upright standing resistor.
- Page 20 Schaltbildauszug / Circuit details: Position und Lötpunkte (bei Q 41 und C 132) des Trimmers auf der Bestückungsseite / Position and soldering points (base Q 41 and C 132) of trimmer capacitor on component side of the PC Board...
- Page 21 Trimmer Luftspule air coil zusätzliche Drossel (1.5 µH) auf der Unterseite der Platine / additional fixed inductor 1.5 µH on soldering side of PC Board Hier wurde die alte Spule ausgelötet und die neue Luftspule von der anderen Seite aus eingesetzt Here the old coil T 14 has been deleted and the new air coil inserted from the...
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