Thanks so much for the link. While I was not able to find the manual for the 1544, I was able to find several others that are close enough. I also found a site, ElektroTanya that had a variety of BK Precision manuals but after downloading 3 which I learned was the limit for a "Guest" I had to take a test to register! I failed one of 5 questions and was told to try again another day! A bit strange but there it is. I really hope I can find a service manual for this unit. It was made in Japan by the Dyanscan corporation but searching on that was enough less fruitful than searching on B&K. Thanks again for the link. It will useful in the future.