DoorKing 1812 Bedienungshandbuch PDF herunterladen (Seite 41)

SECTION 5 – MAINTENANCE

The DoorKing telephone entry system is essentially a maintenance free device. When the unit is

properly installed, it should provide years of trouble free service. Maintenance is limited to updating

the directory and phone number and/or entry codes when residents move in or out.

The faceplate of the unit should be cleaned on a regular basis to keep contaminants in the air from

sticking to the surface and possibly causing pitting. When cleaning the faceplate of the system, never

use an abrasive cleaner or cloth. Stainless steel cleaner works very well with a soft cloth for systems

with a stainless steel faceplate. A clean damp soft cloth should be used to clean gold plated

faceplates.

5.1 TROUBLE SHOOTING

If problems should develop with your telephone entry system, refer to the trouble-shooting guide on

the following pages to try and correct any problems. Our experience has shown that a majority of

reported problems are actually programming related and can be corrected on site. If problems persist

and they cannot be corrected, contact your authorized DoorKing dealer for assistance. Before

performing any trouble-shooting, check the following:

1. Have a good VOM meter handy to check voltages and continuity.

2. Have a telephone test set (DoorKing p/n 1800-050 or equivalent) to check the

telephone line. Noise on the phone line will cause problems with the entry system.

3. Be sure that the entry system case is properly grounded.

4. Be sure that the telephone wires are twisted.

5. A hum on the system indicates that the phone line or 24 VAC power lines may be

grounded. Check to be sure that the phone lines or power lines are not shorted to

ground. Be sure that the cable used for communication is a twisted pair, good quality

phone cable insulated for direct underground burial. Using phone wire that is

designed for indoor use only can absorb moisture and cause a hum on your phone

line.

6. Check the 24 VAC system power. Be sure that the transformer is properly rated (20

VA). Keep the wire run from the transformer to the entry system as short as possible.

Use 16 or 18 AWG, 600 volt insulated wire only. The importance of proper power

wiring cannot be over stressed!

Isolating Noise Problems

If noise or hum is present on the residents phone line after installation of the 1812 telephone intercom

system, use the procedure on the next page to find and correct the source of the noise. This

procedure will require the use of a telephone test set (DoorKing p/n 1800-050 or equivalent).

Typically, noise is usually introduced into the system because of incorrect wiring, poor quality of wire,

wire runs exceeding maximum distances, phone and high voltage power wires running in the same

conduit or in very close proximity to each other, a wrong type transformer was substituted, or the

phone lines, power lines or 1812 circuit board is grounded.

1812-065-M-3-07 Page 41

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DoorKing 1812 Bedienungshandbuch Seite 41