Samsung SF3000 Service Manual page 54

7-6. Malfunction on Copy
Load document in
START
Y
CIS LED on ?
N
See chart 7-5
Check cartridge
N
Good ?
Y
Replace the
main b'd
END
Samsung Electronics
feeder
N
Copy works
properly ?
Y
A
Y
Good ?
N
Replace cartridge
Check U11, U12
Y
in the main
boaard
Y
Document fed ?
N
See chart 7-4
5V
Check
0V
CIS clock (P5-8)
the main board
Y
Normal ?
N
Replace the
main b'd
Measure voltage
+5V and
+24v ?
N
Check harness
N
Replace harness
Good ?
Y
Replace the
power supply
Troubleshooting
Press the
COPY button
Replace CIS
N
on the main
Copy produced ?
board
Y
A
7-9