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FAQ 176-2002-en

How can I detect an EEPROM failure in a SAT 100 or STAR unit?

Respuesta: 

To be able to detect if a sound failure has been produced by the EEPROM memory (ic8 - pcx8582), use the portable programming unit and follow these steps:

  • Take any SAT100 or STAR unit that you are sure works correctly.
  • Plug the programming unit into the SAT100 or STAR unit.
  • Select the audio menu:

    because of the software, the audio frequency range is limited from 5 to 8 MHz.

If you are able to go either below or above these limits, it means that the IC8 EEPROM is not functioning correctly and must be replaced.

  • To remove the IC8 from the PC board you do not need a special de-soldering tool, simply proceed as indicated below:
    • Work first on one side of the IC8 and then on the other side.
    • Solder the three pins of each side of the chip together (see figures).
    • Then, by keeping the soldering in the tin melted, you should be able to remove the three pins at the same time from the PCB.
    • Next, proceed in the same way with the other side of the chip.
    • Finally, clean the excessive soldering tin from each track of each pin on the PCB (see picture)

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