Troubleshooting Guide - Aiphone DUAL MASTER CHIMECOM SYSTEM C-123LW Supplemental Instructions

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, fluorescent 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 first 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:

# PROBLEM
No call in from door to master, but communication
1 works fine.
When the talk button is pressed, the other master
2 rings.
When the talk button is pressed, feedback is heard
3 at both masters.
4 Unit appears dead; no functionality.
5 System squeals and batteries get hot.
6 Chime tone sounds weak, lower frequency.
7 Master stays on; does not time out.
8 Voice volume is too loud or too soft.
9 Chime tone volume is too loud.
10 RY-AC external signaling relay not working.
Aiphone Communication Systems
1700 130th Ave. N.E.
Bellevue, WA 98005
(425) 455-0510
FAX (425) 455-0071
POSSIBLE CAUSE
Reversed DAK-2S component module.
Missing or reversed DAK-2S component
module.
Common power supply.
Terminals 1 and - crossed.
Power supply and batteries both installed.
Weak batteries or low voltage.
Incorrect cable being used.
Volume control not adjusted properly.
Standard volume level.
Missing or wrong connection.
Toll Free Technical Support:
(800) 692-0200
E-mail tech-serv@aiphone.com
SOLUTION
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
end under the 1 terminal, and the door station 1 wire tied to the
colored wire end of the DAK-2S.
Install the DAK-2S component module as described above and
shown on dual master instructions.
If both C-ML/A's share the same power supply, a ground loop
feedback will occur when the talk button is pushed. Install separate
SKK-620's for each master, or install batteries in each master.
"+ / -" are on left column, "E / 1" are on right column. If swapped, unit
will appear dead. Verify that 1 wire from the door station is connected
to 1, and negative of power supply is connected to -.
Take batteries out of the master station. Both power sources cannot
be used simultaneously.
If batteries installed, replace them. If power supply, check for 6V DC.
If low, install new SKK-620 power supply.
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 specifications in the instructions.
Remove front cover of C-ML/A and locate volume potentiometer
through hole at the bottom of the 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 modification would be required, which is not practical.
Make sure the negative from the 12V DC 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 1 terminal, not negative terminal.
Pg. 4
C-123LW Supp Instr.
#90102
0906JS