Thales DVOR 432, Техническое руководство

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DVOR 432
Operation and Maintenance Repairs
6-15
Ed. 01.04
6.2.2 Correcting a Processor Standstill
A processor standstill may result when subassemblies are removed under voltage or on account of
static charges which are discharged fromthe operators to the rack. This condition is always the result
of an operator error. It is therefore advisable to pinpoint the causes as soon as it happens. There are
in fact only four possible causes, though these may occur in combination.
- Insufficient grounding of the rack
- Unsuitable and/or incorrectly cleaned floor covering
- Non-observance of clothing regulations by personnel
- Carelessness of the personnel due to inadequate information.
Any causes determined should be remedied immediately by means of appropriate measures: the
symptom will not then recur. A distinction should be made in case of a processor standstill between
a failure in the keyboard processor and a failure in the equipment central processing unit. Both the
behavior of the systemand the measures to be taken are different.
6.2.2.1 Failure in the Monitor Processor
See Fig. 6-1.
The LCP shows MON1 FAULTY or MON2 FAULTY due to to the failed processor on its LCD screen.
If both monitors fail, the transmitter will be shut down.
Remedy:
- Open front door of the rack.
- CPU live lamp on the MSP must be lit.
- If live lamp is off, press reset button on MSP.
- Close door again.
- Perform login and enter password if more commands must be entered, otherwise this step may
be ignored.
The installation is then fully operational again.
6.2.2.2 Failure in the Transmitter Processor
See Fig. 6-1.
If lamps light up on the system in a manner which has no meaning and cannot be interpreted, then
go out again after a short time, then the processor has fallen out of synchronism temporarily on
account of an interference pulse, but has been able to recover. If this symptom is encountered repeatĆ
edly, the causes should be determined. If the transmitter fails on account of a processor standstill,
this is displayed by means of TX1 or TX2 WARNING on the LCP.
Remedy:
- Open front door of the rack.
- CPU live lamp on the MSG-C must be lit.
- If live lamp is off, press reset button on MSG-C.
- Close door again.
- Perform login and enter password if more commands must be entered, otherwise this step may
be ignored.
The installation is then fully operational again.