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Operation and Maintenance
6.2.3.2.1
Replacing EPROM
NOTE:
Before starting it is recommended to read out all parameters of the installation:
Use command Download Parameters or make a printout of all parameters or write down
manually the indicated parameters if other measures are not possible.
It is also recommended to generate a copy of the specific site files as backup:
- In the PC User Program, click the Control button in the Main Status window.
- Select File Transfer and Copy SITE file to PC in the submenu. Copy all files with the
extension:*.sit, *.oio, *.msk, *.ptt.
The EPROM should always be replaced by qualified personnel only. The following subassemblies
contain EPROM which may need to be replaced: MSG-C, MSP , CSL (test generator). The locations
are shown in Section 6.2.4.
Since the EPROM are electrostatically sensitive components, the following safety precau
tions must always be observed (see also Section 6.2.1.1.3 ): The person replacing the
EPROM should preferably not wear shoes with rubber or plastic soles, and should first
eliminate any static charges by touching the transmitter rack with both hands.
a) Switch off both transmitters: set the TX1 and TX2 switches on the PMM to OFF.
b) Release the MSG-C resp. MSP or CSL with the lever mechanism and remove it from the slide-in
chassis in the rack. Lay the subassembly down on an electronically conductive surface (e.g. on
the special packaging provided).
c) Remove the EPROM:
Identify the EPROM to be replaced by means of its inscription and note its orientation (notch on
one of the narrow sides). Lever the EPROM slowly out of the base by carefully applying a flat,
pointed object (e.g. a screwdriver) to the narrow sides alternately.
d) Fit the new EPROM:
Fit the new EPROM into the empty base in the same position. If the EPROM is swapped from one
unit to another, determine the correct orientation by comparing the two units. Before fitting the
EPROM, check that all the pins are aligned exactly. Press the two rows of pins into the base one
at a time.
e) Reinstall the MSG-C resp. MSP or CSL and lock it in position.
f) Execute the following checks after switching on the transmitter again:
- the live LED must light up (MSG-C, MSP)
- create new EPROM checksum for monitor 1 and 2 (refer to 6.2.3.2.2 ).
- all the transmitter and monitor settings must correspond to test reports.
6.2.3.2.2
Creating new Checksum for MSP EPROM in ADRACS
Change of EPROM on MSP makes it necessary to create a new EPROM checksum:
- Select the station where the EPROM of MSP is changed. The 'Detailed Status' window appears.
- Select in menu Commands the item More Commands.... The 'Commands' dialog window appears.
- Select in menu Monitors the submenu Monitor Miscellaneous. Select the command create EPROM
checksum.
- Click on button program MON 1/2 to create the new checksum.
- Click on button Close to close the 'Commands' window.
Ed. 01.04
CAUTION
DVOR 432
Repairs
6-19
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