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Troubleshooting
7-10. No Dial Tone
START
Press OHD/V.REQ.
Dial tone ?
OK
Lift Handset
Dial tone ?
NG
Check/ Replace:
Handset cord
Handset, Hook
Switch, LIU U1,
LIU Board
Return machine to
Custmer
7-14
Test Telephone
Cord
OK
Use a phone to check
NG
service at wall jack
Service OK ?
Y
OK
Main PCB U2-45
CML1
H
H
Main PCB U2-
93 SPK_CTRL
L
Check logic
U26-9, 10, 11
Y
NG
N
L
L
H
N
Good ?
Replace Telephone
Cord
Request Telephone
Service
Check/ Replace:
Speaker
Main Board U16
Main board
Replace LIU PBA
Y
Replace main PBA
Samsung Electronics
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