Samsung FACSIMILE SF40 Service Manual page 19

Chart 6 No Copy Mode Operation
Press start key
Load document
in feeder
Copy
Produced?
YES Check +5V
from P1-7 to P1-8
Check 24av
ol else
motor pulse
(P7-1, 2, 3, 4)
Replace motor
Replace main
board
YES Replace main
NO
YES
Unplug P3 check — ee
Unplug P7 at main
board. Check again
Replace power
supply
18