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INSTALLATION TIPS:
1. Use shielded wire for the communication path, and ground one end of the shield to an earth ground.
2. Run intercom wire at least 20” away from AC wiring, fl uorescent lights or dimmer switches.
3. Keep intercom cable away from alarm, data, phone, video cables, and any other potential source of
interference.
4. Door release wires must be in a separately jacketed cable from the intercom wires. Use two separate
cables; one for audio and one for door release.
5. When installing a second master station, wire must be run from the fi rst master station, not from the
door station. See diagram on page 2.
6. Do not install the master station near light switches, dimmer switches, or other devices that may cause
interference with the intercom system.
7. Do not install the master station on the opposite wall from the door station. If the units are too close,
acoustical feedback may result.
TROUBLESHOOTING GUIDE:
Aiphone Communcation Systems
1700 130th AVE N.E.
Bellevue, WA 98005
(425) 455-0510
FAX (425) 455-0071
Toll Free Technical Support:
1-800-692-0200
E-mail tech@aiphone.com
C-123LW Supplement
Pg. 4
#90102
0610JD
PROBLEM
POSSIBLE CAUSE
SOLUTION
No call in from door to master, but
communication works fi ne.
Reversed DAK-2S component module.
When door calls in, it shorts the #1 terminal to the E terminal.
If the DAK-2S is installed backwards the chime from the
door call-in will not be heard. Install the DAK-2S component
module with the bare wire under the 1 terminal, and the door
station 1 wired to the colored wired end of the DAK-2S.
When the talk button is pressed, the other
master rings.
Missing or reversed DAK-2S
component module.
Install the DAK-2S component module as described above
and shown on the dual master instructions.
When the talk buton is pressed, feedback is
heard at both masters. Common power supply.
If both C-ML/A’s share the same power supply, a ground loop
feedback will occur when the talk button is pushed. Install a
separate power source for each master.
Unit appears dead; No functionality Terminals 1 and - crossed
+/- are on left column, E/1 are on right column. If swapped,
unit will appear dead. Verify that 1 from the door station is
connected to 1, and negative of power supply is connected to -.
System squeals and batteries get hot
Power supply and batteries both
installed.
Take batteries out of the master station. Both power sources
cannot be used simultaneously.
Chime tone sounds weak, low frequency Weak batteries or low voltage.
If batteries are installed, replace them. If using a power
supply, check for 6VDC. If low, install a new SKK-620.
Master stays on; does not time out.
Incorrect cable being used.
Volume control not adjusted properly.
Standard volume level.
If the resistance of the wire is too great, usually from
exceeding distance limitations, the master may not time out as
designed. Refer to wire specifi cations in the instructions.
Remove front cover of the C-ML/A and locate volume
potentiometer through hole at bottom of unit. Use a small
screwdriver to adjust the volume, clockwise to increase.
There is not a separate call tone volume adjustment on the
C-ML/A so the volume level cannot be altered. Surface mount
component level modifi cation would be required, which is not
paractical
RY-AC external signaling relay not working. Missing or wrong connection.
Make sure the negative from the 12VDC supply for the RY-AC
is connected to the negative of the C-ML/A master. Make sure
the WHITE wire of the RY-AC is connected to the DAK-2S
component module to terminal 1, not negative terminal.
Voice volume is too loud or too soft.
Chime tone volume is too loud.