THE NL3ASD MODIFICATION FILES - THE HAM RADIO MODIFICATION - PAGES PAGES A TO D

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Date: Wed, 27 Jan 88 08:58:58 est From: mac@idacrd.UUCP (Bob McGwier) To: ka9q.bellcore.com!n4hy@bellcore.UUCP Subject: 56K modem fixes 56 kilobaud modem bug report (1-10-88) TRANSMITTER ENCODER BOARD 110386: Some of the 110386 transmitter encoder boards have a missing trace between U10 pin 21 and pin 24 This problem exists only in the second batch of boards and was due to tape falling off the artwork To fix it just solder a wire between U10 pin 21 and 24. RECEIVER DECODER BOARD 021987 REV A: There have been reports that various brands of 555 timer chips don't work well (or at all) in socket U7. I have discoverd the cause of this problem The ground side of capacitor C1 needs to be DIRECTLY connected to pin 1 of U7 You need to cut the trace that goes between component carrier N1 pin 9 and ground Solder a wire from N1, pin 9 to U7 pin 1 All non-CMOS 555 chips should work with this mod The next release (rev B) will have this fixed. From: Dale A Heatherington WA4DSY Copied From: The Windows Ham Radio CDROM

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