Guardian Telecom
Installation and Operation
DTR/DTT-VoIP Series Telephones
Page 18
11. Field Repairs
Field repairs may only be carried out by qualified technicians using OEM parts. Substitution of
parts voids warranty and may pose a hazard to users of the equipment.
Disconnect the telephone IP Cable and Aux Power if necessary.
Carefully remove the front cover assembly and separate from the housing by disconnecting the
wiring. NOTE that the handset and all electronics are attached to the front plate.
Perform the necessary repairs or adjustments.
Carefully replace the front plate and install all four screws. Do not over tighten the cover screws.
There is a flexible gasket between the cover and the body; excessive tightening of the screws
deforms the gasket and reduces the weather resistance of the set.
Tip: Torque screws to 2.5
in/lbs (0.28 Nm).
Handset Replacement
Refer to the instruction sheet included with the replacement handset.
Disconnect the handset wiring from the terminal block.
If the phone is equipped with an armored cord handset, remove the anchor screw from the
armored cord lanyard.
Loosen the handset cable gland and pull out the cord.
Install the new replacement handset and tighten the gland.
Rewire the handset cord to the terminal block.
Ringer Speaker Replacement
Unplug the speaker connector from the main board.
Remove the screws that hold the speaker cap to get access to the speaker.
Install the new speaker and gasket.
Reconnect the speaker connector to the main board.
Main Circuit Board Replacement
Label any wiring attached to the circuit board. Disconnect wiring and ribbon cable.
Remove the screws holding the circuit board in place and carefully remove the board.
Install the new board and reconnect wiring.
