DoorKing 1812 Plus - Manual (Page 43)

SECTION 5 – MAINTENANCE
The DoorKing 1812 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 access codes and temporary access codes on an as needed basis.
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 Troubleshooting
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 troubleshooting, 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. Check the polarity of the phone lines. See section 5.2.
4. Be sure that the entry system case is properly grounded.
5. Be sure that the telephone wires are twisted.
6. A hum on the system indicates that the phone line or 16 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.
7. Check the 16 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!
1812-161-E-1-10 Page 43