Merlin 3070 Service And Maintenance Manual page 51

TROUBLE ON ONE TELEPHONE
Lights
3.
Voice terminal is defective.
Control unit Voice Terminal
4.
Module is defective.
5. Control unit is defective.
A4-4
3. Switch the suspect voice terminal with one
known to be working properly. If the trouble
does not appear on the working voice
terminal, the suspect voice terminal is
defective. Replace it.
A surge of static electricity may have caused
the voice terminal to fail. If there is new
carpet near the voice terminal, spray the area
with an antistatic spray or place a rubber mat
under the voice terminal or user's chair.
4. Make sure all cords are labeled before
unplugging them from the voice terminal
modules.
Unplug the cords from the voice terminal
module, insert a spare voice terminal module,
and plug the cords into it. See if the voice
terminal operates normally in the test mode. If
you don't have a spare voice module, unplug
the cords from another voice terminal module
and use it as a spare.
5. The pins at the back of the control unit voice
terminal module slot may be damaged or bent.
If so, the control unit will probably require
repair.
Never reinsert a module in a slot with bent
pins. This could create worse problems,
such as destroying the control unit Power
Module or backplane.