Kyocera 4035-light edges when scanned from feeder

[soutec]

I have a 4035 that makes excellent copies when you
copy from the glass or print to it from the network.
However when you scan from the doc-feed both sides
of the doc (1 inch in) are are very light. have tried to
adjust using sim 60 scan input and 74 doc-feed balance. Also replaced scan glass cleaned mirrors and replaced the exposure lamp. Any ideas what might be the cause. Thanks

[LNorris]

does the "lightness" get worse as it scans? or is it pretty consistant down the edges of the page?

[kyoceradude]

Adj sim 68. Adj dp scan position.

[soutec]

Thanks all for the good information on the sim u068.
I plan on going back tommorrow and give that a shot.
Is it necessary to adjust sim's 65,66,67,70 and 71?
Also do you have any idea what would cause the adjust
ment in sim 068 to change? Thanks for all the great help!