Samsung SF6500 Service Manual page 97

Maintenance & Troubleshooting
7-4-7 Malfunction in Auto Answer
START
Call the machine
from another phone
7-12
Y
Auto answer?
N
Check ring signal
on P4-8 in main b'd
Y
5V
?
0V
N
Check ring signal on
U1-25, 28 in LIU b'd
Y
Normal?
N
Replace the LIU b'd
Replace the main b'd
Samsung Electronics
END