Guardian Telecom Inc.
Installation and Operation
DTT-50 & DTT-60 Telephones
Page 9
Field Repairs & Adjustments
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.
See: Replacement Parts
•
Disconnect telephone wiring at the demarcation block and ring detect relay
power at the breaker to avoid shock hazard.
•
Loosen the four captive screws in the faceplate and detach the faceplate
from the base.
•
If the telephone is wall mounted temporarily hang the faceplate to the right
side of the base using two of the faceplate screws. Be careful not to lose the
"O" ring retainers.
•
Perform the necessary repairs or adjustments.
See: Figure 5 -
Temporary Mounting for
Wiring
•
Carefully replace the front plate and install all four screws.
•
Reconnect telephone and ring detect relay wiring.
Tip: Torque screws to
1.65 ft/lbs (1.36Nm).
Hands-free Speaker Phone Voice Switching Adjustment
•
Locate the Voice Path Switching potentiometer.
See: Figure 4 - Wiring
•
Adjust the potentiometer clockwise to increase the receive sensitivity.
•
Adjust the potentiometer counter-clockwise to increase the transmit
sensitivity.
Handset Replacement
•
Disconnect the handset wiring from the terminal block.
See: Figure 4 - Wiring
•
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 and tighten the gland.
•
Rewire the replacement cord to the terminal block.
Supplemental Receiver and Headset Replacement
•
Disconnect the supplemental receiver/headset wiring from the terminal
block.
See: Figure 4 - Wiring
•
Loosen the cable gland and pull out the cord.
•
Install the new replacement and tighten the gland.
•
Rewire the replacement cord to the terminal block.
Hands-free 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 six screws holding the circuit board in place. Carefully
remove the board.
•
Install the new board and replace the six screws and wiring.
Tip: Torque screws to
2.5 in/lbs (0.28 Nm).
