P300H
P300 Series Modem Installation and Operating Handbook
Page 221
Text on Display
Description / Cause / Notes
UNIT FAULTS
(Top+Bottom lines of display)
Unit Faults: Status LED=Red, & Unit Fault (prompt) relay
Software Initialising please wait
Unit executing power up sequence (<5 secs)
Unit Fault: Tx carrier muted, unit temp
<nn>C outside operating range 0-60C
This message refers to the internal unit temperature,
Check
the modem vent slots are clear and the
rear fan has not failed. This may be disabled, see Fault Mode = 8 in Appendix E
Unit Fault: PSU fault on
<line>, now <nnn>%
The failed PSU line is shown together with its current value in % of nominal. The unit has a linear
supply and will fail if the mains input is below the specified minimum level.
Check
the mains voltage.
Check
the internal PCB mounted Low Voltage fuses.
Unit Fault: Internal LCA programming
error (cycle power supply)
Internal hardware has failed to initialise, disconnect the mains, wait 5 seconds and then connect it
again. If the fault persists see note 8.
Unit Fault: Internal fault, consult factory
See note 8
Unit Fault: Tx IF synth failure,
Tx carrier muted
The synthesiser, which generates the Tx IF carrier has failed. The unit has muted the Tx IF output to
prevent transmitting an incorrect signal. An external 10MHz station reference may be used as the
synthesizer reference, so if the station reference is in use
check
it is present and has clean enough
phase noise for its intended use.
Unit Fault: Tx carrier generation
failure, Tx carrier muted
The power detector on the generated Tx carrier indicates a carrier generation failure. The unit has
muted the Tx IF output to prevent transmitting an incorrect signal. See note 8.
Unit Fault: Rx IF synth failure
The synthesiser which generates the LO to receive the Rx carrier has failed. An external 10MHz
station reference may be used as the synthesizer reference, so if the station reference is in use
check
it is present and has clean enough phase noise for its intended use.
Unit Fault: Rx PLL internal
The internal backup reference to the Rx PLL has itself failed. This is only actually
used
when the
external reference sources have failed, however it s failure is very significant as the same signal is
used in many places within the modem. See note 8.
backup reference has failed
Unit Fault: Rx PLL Clock
The internal backup clock, generated by the Rx PLL has itself failed. This is only actually
used
when
the external primary clocks sources have failed, however it s failure is very significant, as it should
never fail as it is internally generated. See note 8.
generation failure (<source>/int)
Modem/BUC Fault: FSK Comms with BUC
failed (searching BUC address: xx)
The Modem is configured to operate with a Paradise BUC, and FSK communications between the
modem and BUC have failed. The modem will sequentially search the available range of BUC
addresses in case a replacement BUC set for a different address has been installed
BUC Fault: Outside operating temperature
range (now xx)
The Modem is configured to operate with a Paradise BUC. When the Modem reads the BUC
temperature by FSK and the BUC is outside it s operating temperature.
BUC Fault: PLL in Block UpConverter lock fail
(10M ref' to BUC: On)
The Modem is configured to operate with a Paradise BUCand the PLL generating the SHFcarrier in
the BUC has failed. The state of the reference feed to the BUC is also reported.
