Philips Avalon CTS M2720A Service Manual page 69

Common Problems
Possible Reasons
Is the antenna functioning properly?
Is the Avalon CTS mounted in an enclosed metal
rack?
Is the patient near material that absorbs
electromagnetic waves (for example, metal-
reinforced concrete, elevator doors)?
Is the frequency range of the base station
different from the transducer?
Are there other Avalon systems in the same
location with the same frequency range?
Is the transducer battery performance suspect? Charge the battery.
US acoustical signal is noisy, indicating
interference.
Action
Standard antenna: check the connection to the base
station.
Remote antenna: check the connection to the base
station. Test the antenna system by bringing the
transmitter close to the receiver. If the transmission is
good, then the antenna system is not functioning
properly. See also "Broadband Interference" on
page 69.
Try the base station outside of the rack. If there is a
marked improvement, use the optional Antenna
Extension Mounting kit (M2720A Option K01).
If the problem relates to the construction of the
building, consider an alternative location if this is
practical.
Ensure that both the base station and the transducers
operate on the same frequencies. If necessary, change
the frequencies. Refer to the Service Support Tool Help
for details.
In the case of multiple cordless/telemetry installations,
allocate a unique fixed frequency to each system.
If battery performance is still not satisfactory after
charging, carry out the battery check. (see page 43).
If necessary, change the transducer battery (see
page 75).
To solve US interference problems:
• In the case of a base station and transducers using
automatic channel search, bring the transducer
back to the base station and register it to a new
frequency by docking it in an appropriate slot.
• In the case of a base station with fixed frequencies,
increase the channel spacing between the
transducer slots (see "Base Station with Fixed
Frequency" on page 70).
• In the case of transducers with fixed frequencies,
change the frequency and/or increase the frequency
spacing between transducers (see "Transducers
with Fixed Frequency" on page 71).
7 Troubleshooting
63