DoorKing 1838 Telephone Access Plus - Manual (Page 37)

1838-066-D-1-12 Page 37
SECTION 4 – MAINTENANCE
The DoorKing 1838 access controller 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.
4.1 Troubleshooting
If problems should develop with your access control 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
(if using the modem for programming). Noise on the phone line will cause problems with
programming the access controller.
3. Check the polarity of the phone lines (if using the modem for programming). See section 5.2.
4. Be sure that the 1838 housing is properly grounded.
5. Be sure that the telephone wires are twisted (if using the modem for programming).
6. A hum on the system (if using the modem for programming) 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!