Troubleshooting
SF150T
6-15
6-11. No Dial Tone
NG
OK
OK
Y
H
OK
NG
NG
OK
N
L
NG
Start
Request
Telephone
Service
Check/Replace:
Speaker
Main Board U14
P4, 205, 206
Replace U3
Lift Handset
Dial tone ?
Service OK ?
Main PCB
U7-54
CML1
Main PCB
U3-29, 31
SPK_OUT
Dial tone ?
Return
machine to
Customer
Press
OHD/V.REQ.
Replace
Telephone Cord
Use a phone to check
service at wall jack
Test
Telephone
Cord
Check / Replace:
Handset cord
Handset
Hook Switch
LIU U201
LIU Board