Samsung OFFICESERV 7100 Service Manual page 122

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3.4.5.3 Ring is not Terminated
The procedure for resolving the problem that occurs when C.O. line ring is not terminated
is as follows:
Check if the ower provided to TIP-
RING exceeds 40 VRMS.
Does the power provided to
ring exceed 40 VRMS?
Yes
Is the HOS output HIGH?
Yes
Raplce TMC.
(LINE1~4: U5, LINE 5~8: U6)
3-28
No
Repair the C.O. line.
No
Check the ring path composed of
R, C, and two ZENER diods.
Replace LOOP HYBRID and
PHOTO-COUPLER.
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