C550 with 1.3 m copies perdominatly from tray 3/4. Latest firmware... Getting 17-10 code on tray 4. Replaced entire feed head from known working MFP with no change. No issues from tray 3. Tray 4 feeds 1st sheet about 3/4 in past paper feed sensor and stops. However, when I set tray 4 for "Thick" (slows copy speed down) I can run all day with 0 jams. I guess whats confusing me is 17-10 code is related to tray 3/4 horizontal transport, but I'm running from tray 4 so this code should not pop up and again, I can run the entire 1500 shhets from tray 3 w/o issue. Any ideas? Emujo
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