KEF Ci200.3QT, CiFDT, & Ci3-80QT Trouble shooting Guide
The majority of reported problems with the Ci200.3QT, Ci3-80QT and the CiFDT are
related to one of two possible issues; either poor quality / undersized power supply OR
faulty control wiring. Please see the wiring diagrams at the end of this document for
proper control wiring. For the Ci200.3QT there is one additional potential issue related
to the limit switches.
Please note that the main power supply must always remain energised or the speaker
may drop to the open position.
All Models:
1) Although the units will work with a 12volt power supply that has 350mA
available per connected speaker, the system will work much better if a larger
power supply is used to provide some head room. We suggest a minimum of
400mA be available per speaker. It is important that a high quality supply be
used that has less than 150mV AC Ripple.
2) Two of the most common problems found with faulty system wiring are;
a. Power supply is connected with polarity reversed. This will likely
damage the control board and require the need to replace the control
board.
b. When using a 12V trigger from a surround receiver not connecting both
the negative lead from the 12V trigger and 12V power supply to the
black (negative) power wire on the speaker. This will cause
unpredictable and hard to diagnose behaviour.
Ci200.3QT Only: Limit Switch Problem.
3) If there is a limit switch problem then when the product was 1st installed and
tested it would have behaved properly when rapidly cycled. But if one of the
two limit switches is out of alignment then power to the motor would not shut
off properly and after remaining in this mode for a while thermal protection on
the board will engage.
To test this condition, shut off both the 12volt power supplies and let sit for
approx. 5 minutes. Reconnect power and the motor should then function
properly if the speaker is cycled. You must check and adjust the limit switches
or the problem will reoccur.
There are two possible reasons why the limit switch problem is happening. One
is that one or more corners of the product were over tightened when installed
and this is causing excessive flexing of the mounting frame which is pushing
the product out of alignment. Adjust the mounting screws if this is the problem.
The other potential reason is that the limit switches were set too close to one end
of their tolerance and the normal flexing of the products when installed is
causing them to not engage properly. This is very uncommon on the .3 version
of the Ci200QT
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