Hi all, I've been a member for a while but lurking in the background while working on the scope and looking out for any discussions about a 1740A taking place.
I now have the scope in a running condition after replacing 2 faulty transistors and now while testing the scope with the 1V test connection I discover that channel B works as expected but channel A works OK up to 0.2V on the volts/div switch, moving to 0.5V and upwards the trace goes odd.?
I was wondering if anyone could point me to the area that I need to be looking at on channel A to cure the problem. I have uploaded photos of? both channels with the settings on 0.5V and 1V so you can see the problem?
[url=https://flic.kr/p/ZpqZUY][img]https://farm5.staticflickr.com/4503/37677492692_c2c839b7dd_b.jpg[/img][/url][url=https://flic.kr/p/ZpqZUY]B channel 1V dc[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
[url=https://flic.kr/p/Yr33kT][img]https://farm5.staticflickr.com/4471/37039289513_ec6ceee9c7_b.jpg[/img][/url][url=https://flic.kr/p/Yr33kT]B channel 0.5V DC[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
[url=https://flic.kr/p/Yr33nM][img]https://farm5.staticflickr.com/4480/37039289623_04aa1256a5_b.jpg[/img][/url][url=https://flic.kr/p/Yr33nM]A channel 1V DC[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
[url=https://flic.kr/p/Yr33qc][img]https://farm5.staticflickr.com/4446/37039289763_5022ed8666_b.jpg[/img][/url][url=https://flic.kr/p/Yr33qc]A channel 0.5V DC[/url] by [url=https://www.flickr.com/photos/158191416@N07/]Graham Butcher[/url], on Flickr
Thanks in advance for any help you can offer me.
Graham
