When you say you have cleaned the heads its assumed that you mean by using a cassette type cleaner, this is many cases isn't really good enough and a proper and carefully carried out "wet" clean is most likely to be required, however as you have restricted your e-mail address full info on the procedure cannot be sent due to it having an attachment for illustration purposes which "cannot" be pasted into a web site like this for technical reasons.
Anyone who hides their e-mail address always excludes themselves from receiving full info for this reason.
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