3/4Trunk Failures - Samsung OfficeServ 12 Service Manual

3.8 3/4TRUNK Failures

Failure 1
When No Trunk is recognized.
Troubleshooting 1
Check if the absolute voltage
between the TIP and the RING is
higher than 30 V under hook on
status
Is the voltage normal?
Yes
Check if the Relay is running
(by sound) during trunk seizure
Is the Relay
normally operating?
Yes
- Replace the TMC
- Replace 3/4TRK board
© SAMSUNG Electronics Co., Ltd.
No
Yes
No
Check the Relay control signal
Is the Relay control
signal normal?
Yes
Replace the Relay
Remove the CO line from the card
before measurement
Is the voltage
between the TIP and RING
higher than 30V?
No
Request to repair the trunk line
No
Replace TMC
(Trunk Module Controller)(U51)
END
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