Samsung OFFICESERV 7100 Service Manual page 135

3.4.7.5 When the Ring Does Not Rise
The method to solve the problem when the ring does not rise in the 8COMBO port as follows:
Start
Is the RELAY sound generated?
Yes
Check if the 20 Hz ring
signal is generated from the
NAGATIVE port of D38.
Is the ring signal generated?
Yes
Replace RELAY of the
corresponding port.
© SAMSUNG Electronics Co., Ltd.
No
Is the ring control port
signal of SBS9401
generated?
Yes
- Replace RELEY.
- Replace TR.
Is DC which is
No
approximately 75 V
output at both ends of
C246, 247?
Yes
Replace Q58, 59, 60, 69.
End
OfficeServ 7100 Service Manual
No
Replace SBS9401.
End
No
- Replace PWM IC(U19).
- Replace Q57.
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