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Guardian Telecom Inc.
Installation and Operation
Desktop Ringdown Telephones DTR-51-Z & DTR-61-Z
Page 10
Fuses
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There are no replaceable fuses in the DTR-Z.
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The phone line fuse on the circuit board of all models is of the resettable
type and is not replaceable. If the fuse trips due to an external event it will
reset in a short period of time. The duration will depend on ambient
temperature and other factors. If the fuse trips repeatedly check the
telephone system wiring. The fuse protects the Tip and Ring line from the
telephone system. It is usually powered at 48 volts DC and must not be
connected to 120VAC or 230VAC.
•
The Ring Detect Relay fuse is a 5 Ampere, fast blow fuse. It is potted to
prevent an exposed spark. If the fuse blows the circuit board must be
replaced.
Operating the DTR-Z
Lift the handset and the telephone will dial automatically. Adjust the handset
volume to a comfortable level with the volume control switches on the handset.
When the call is completed replace the handset in the cradle.
Cleaning Tips for Guardian Telephones
Guardian Telephones may occasionally need to be cleaned to maintain appearance. Generally,
wiping the surface with a clean, water dampened cloth will remove most films or residues. If the
soiling is too stubborn for plain water, a mild detergent solution may be used. Be sure to wipe
away any detergent residue with a plain water dampened cloth. The Telephone may be
cleaned with any general-purpose household glass and surface type cleaner. Do not spray the
telephone directly! Spray the cleaner on a soft cloth then wipe the surface. Pre-treated cloths,
like those used for eyeglasses or cameras, may be used to clean the Telephone. Premoistened
towelettes may also be used, however, avoid those containing lanolin or aloe as they will leave
a slippery residue. The handset and surface of the telephone may be cleaned with disinfectants
used for general cleaning in a medical environment. Isopropyl alcohol may be used applied with
a cloth. Avoid using alcohol on silicon based keypads, since doing so may significantly degrade
legibility.
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Do not use furniture polishes, waxes or plasticizer-based cleaner (Armor All etc.)
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Do not use lanolin, aloe, glycerin or other skin care type products.
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Do not apply any solvent such as acetone, mineral spirits etc.
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Do not directly spray or immerse the handset.