DoorKing 1812 Classic - Manual (Page 38)

1812-065-U-12-13 36
18
17
16
15
14
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12
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10
9
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7
6
5
4
3
2
1
MIC
VOL
FB1
FB2
SPEAKER
VOL
MASTER
CODE
ON
1871-010
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 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 37 and 38 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 5.3 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 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.
7. Check the 24 VAC system power. Be sure that the transformer is properly rated (20 VA). Keep the wire run from the trans-
former 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
5.2 1812 Classic Wiring Schematic
Keypad
Microphone
1998-010
LED Keypad Light
Push to Call Button
Speaker
Purple
Red
Wire
Right
CN2 8-Pin Door
Accessories Plug
White
White
Green
Gray
Red
Orange
White
Green
P3 10-Pin Keypad
plug position
on circuit board -
Red wire left.