Samsung OFFICESERV 7100 Service Manual page 118

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3.4.3.2 Hook On/Off is not Available
Start
Hook On/Off is not performed in
all ports?
No
Pin8 iput of CPC5623 is normal?
No
U1 input(#24, 31, 32, 33) is
normal?
No
Replace and check UNI.
End
3-24
Yes
Check the line and U1.
Yes
Replace CPC5623.
Yes
Replace U1.
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