Thank Ralph, if you can dig into this, that will be really great. I agree, tour assumptions regarding same hardware base do make sense. I hope, Canon engineers had the same idea. ;)
Just give me a hint, if you like to have some debug output to compare from the model I use when you have time. Kind regards, Jörn-Ingo Weigert Am 13.10.2017 20:28 schrieb "Ralph Little" <littlesincan...@yahoo.co.uk>: > Hi, > I have also had problems with my Canon MF4770N and Rolf has been kind > enough to assist in the past although it has become increasingly apparent > that he is really busy with other things. > > It still doesn't work and it is something that I would like to rectify. > > I do have the skills to get to the bottom of it, but I also don't have > much time to devote to it but it is on my TODO list sort out. > For my scanner, some of the setting combinations don't work very well or > sometimes put the machine in a hardware failure state resulting in my > having to power cycle it, most likely the result of a timing issue or an > illegal combination of options. So there is clearly much work to be done. :( > > Having gained experience with that I might be able to help with other > models. I have a feeling that once one is fixed, a number of other models > will be pretty much the same. Companies like Canon tend to output lots of > models that are pretty much the same inside and it wouldn't surprise me to > discover that solving the problem with one would solve the problem with > many. > > When ADF scanning fails on my multi function then I suspect that sane and > the scanner are out-of-sync, a situation which is difficult to recover from > without some kind of reset of the scanner itself. Sane thinks that the > scanner has reported an error and aborts whereas the scanner is waiting for > instructions to continue the scan from sane. > > I will try to put some time aside to deal with this over the next few days > but I cannot give any guarantees however. > > Cheers, > Ralph Little >
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