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