Samsung FACSIMILE SF40 Service Manual page 18

Chart5 CIS LED Not LIT
Load document
in feeder
oe
Press the start key
Feed
document
NO
See chart 4
CIS LED light
Replace CIS <=
Replace power
unit
Check +5V,—12V
from P1-7, 9 to
P1-8, 10
YES
Check CIS from
P3-10, 4, to P3-7
YES
O0.K?
NO
r
|
Replace main
board
|
17