Maintenance
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t and its contents are the property of CASSIDIAN
nd must not be copied or circul
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FAULTS INDICATED BY THE ALARMS
SHEET A-1
ALARM(S)
PROBABLE CAUSE(S)
CORRECTIVE ACTION
Alarms associated with the 3G PA-TRX module
SYNTHOL, SYNTHOL1,
SYNTHOL2
An LO1 or LO2 synthesiser on
the 3G PA-TRX module's RX1
receiver is unlocked.
• Power up/down the IDR IDO 3G using the
primary converter's "I/O" switch (Plate 6.IV,
item 2 or 9) (wait until the power supply
stops before putting the switch back to "I").
• If the malfunction persists, check the pilot
signal of the synchronisation board
(Sheet P-3) and adjust the frequency if
necessary.
• If the pilot signal is correct, check the
parameters of the 3G PA-TRX module
(contact the manufacturer's technical
assistance department).
• If the parameters are OK, replace the
3G PA-TRX module (Sheet E-5) and the
cable W20 (Sheet E-1).
• If the fault persists, contact the
manufacturer's technical support service.
SYNTHOL2
The synthesizer LO2 of the RX1
receiver of the 3G PA-TRX
module is unlocked.
• Power up/down the IDR IDO 3G using the
primary converter's "I/O" switch (Plate 6.IV,
item 2 or 9) (wait until the power supply
stops before putting the switch back to "I").
• If the malfunction persists, check the pilot
signal of the synchronisation board
(Sheet P-3) and adjust the frequency if
necessary.
• If the parameters are OK, replace the
3G PA-TRX module (Sheet E-5) and the
cable W20 (Sheet E-1).
• If the fault persists, contact the
manufacturer's technical support service.
Table 4.12
FAULTS INDICATED BY THE ALARMS - 3G PA-TRX MODULE
(1/3)
