Controlled Products Systems Group 1812-090 - Manual (Page 48)

1812-162-G-12-10 46
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.
If problems should develop with your telephone entry system, refer to 5.4 troubleshooting table on pages 50 and 51 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 on the next page.
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 16.5 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 16.5 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!
5.1 Troubleshooting
1. Pick up homeowner’s telephone and press * 7. [ * 7 (beep)]
2. Talk and/or listen from homeowner’s phone.
3. Hang up when finished.
4.2.5 Initiate Talk and Listen to 1812 when it has not been activated
The homeowner’s phone can establish direct communication to the 1812 (Talk and listen from the phone) without the 1812
being activated first (Typically a guest pressing the call button at the 1812). This is useful when a normal telephone entry
system transaction does not occur and the homeowner must initiate communication to the 1812 to talk and listen from it.