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Receiver Multicoupler User's Manual
14. Maintenance, Inspection, Faultfinding and Repair Advice
No special maintenance program is required for the Receiver Multicoupler product family. Testing and inspection of a
site's combining system may be included in a Periodic Maintenance Inspection (PMI) program if desired.
Firmware upgrades may periodically be made available and may be uploaded to the RxMux using the Command Line
Interface (CLI).
Checking that the RF connectors on all coaxial cables are correctly torqued (as per manufacturers'
recommendations) is considered good practice.
All other connectors (power, alarm, etc) must be firmly located and pushed into their corresponding mating sockets,
with fastening screws tightened securely.
The Receiver Multicoupler and Expansion Multicoupler are not considered field repairable. Should it be considered
that any unit may be faulty through diagnosis, they should be replaced - or returned to RFI for repair.
Fault-finding Tips
Symptom
All LEDs off
Green LED flashing
Red LED on
Yellow SWITCH
LED flashing
Gain does not
change when using
the USB interface
Gain does not
change when
rotating switches
Levels on the eight
RF Outputs are not
equal
Other Faults
Possible Cause
DC power supply not connected or switched
off.
DC power connected reverse polarity.
Firmware is being updated. If flashing does
not stop after several minutes the download
has not been successful.
DC input voltage too high or too low.
RF input signal is too high
Internal voltage rails are out of tolerance.
Internal amplifier currents are out of
tolerance.
Back panel GAIN switches are set to an
invalid value.
Unit is in Switch Control Mode.
Unit is in USB Control Mode.
Expansion Port has no termination.
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Recommended Action
Check voltage is present with a
multimeter. Also check for correct polarity
and reverse the DC connections if
necessary.
Send one or more CTRL-D characters or
unplug the local terminal.
With a multimeter, check the DC supply
voltage at the RxMux DC input connector
is within the recommended range.
Reduce the RF input level.
Return to RFI for service.
Return to RFI for service.
Set switches to a value between "00" and
the "[maximum gain]", e.g. "15", or "18"
(for RX3852-3408-33-48 only), or "99"
Send "SET CONTROL USB" command.
Either send "SET CONTROL SW"
command via USB or set the GAIN
switches to "99" and cycle the power.
Fit a 50ohm termination to the Expansion
Port.
Please contact RFI for assistance.
Table 9
33
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