VHF 5000 System Functional unit workshop service
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3 Functional unit workshop service
This chapter will explain in detail for each system component:
• The service concept
• How to replace parts that are covered by this service concept
• Verification of the unit that has been repaired
Repairs and components that are not covered by the service concept will not be supported or supplied by Thrane
& Thrane.
3.1 Necessary test equipment
Function Recommended type Parameter
Multi meter Fluke R; >100K ohm
Oscilloscope Textronics 400MHz
Power meter Bird 50W
Frequency counter Agilent Solution 1Hz
Signal Generator Agilent 150-170MHz
Dummy load ohm Bird 50ohm 50W
Also recommended to use radio test set like CMT or Stabilock
3.2 Servicing the RT5022/RT5020 VHF transceiver
The VHF transceivers functionally exist in the following variants:
• RT5022 VHF DSC Simplex, semi-duplex
• RT5020 VHF DSC Duplex
Software updates and configuration tasks can always be performed on board using the SB5006 service tool.
Simple repairs, where the product is disassembled, and larger modules are exchanged, e.g. base unit or front
unit, can also be performed on board, followed by a simple interface check performed from the transceiver user
interface.
More detailed repairs inside the transceiver require the use of instruments to validate performance after repair.
It is up to the service technician to decide whether the repair should be performed on board the ship or in the
workshop.
3.2.1 Software
The software file always covers all functional transceiver models. The product difference is in the hardware, and
which parts of the software that are enabled. The SB5006 is used to configure the software for the specific radio
type.
We strongly recommend the products being updated with the newest software available. A few minutes should
be spent to consider the following:
• All software parts are physically stored on the Base Band module.
• If the product is damaged in a way that no contact can be established to the Base Band module via the
SB5006 service tool, all configuration data might be considered as lost for that radio.
• If it is possible to save configuration data before a possible Base Band module exchange, this should be
done via the SB5006 service tool.
Updating the VHF transceiver to a new software version does not affect configuration data (contact list, private
channels, etc.). Configuration data should always be compatible with new software releases.
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