Installation and Operation
DTR-51 & DTR-61 Ringdown Telephones
Page 10
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:
•
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 screw retainers.
See:
•
Perform the necessary repairs or adjustments.
•
Carefully replace the front plate and install all four screws.
Tip:
Torque screws to
1.65 ft/lbs (1.36Nm)
•
Reconnect telephone and ring detect relay wiring.
Handset Replacement
•
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.
Magnetic Reed Hook Switch Replacement
•
Unplug the Hook Switch Connector.
See:
•
Remove the screw that secures the nylon retainer.
•
Replace the hook switch core with new one and re-secure/connect.
Figure 6 - Replacing Hook Switch
