Help Please

I am suffering from some problem with my Flatbed UMAX Astra 6850.

The main problem is that if a photo is scanned, a yellowish horizontal line

is appear on it.

Also some patterns are there in the scanned image (especially in darker area).

The scanned image is full of grains.

I have been suffering with this problem for the last one year.

 

Kindly do reply with solution

Sincerely

Krishnakumar B (Unni)
ColourPencil
Chalukunnu, Kottayam 686 001
Kerala, INDIA
Mob. +919446962167