
328 Appendix A
Error Messages
Flash ROM Firmware Upgrade Error Messages
Programming Voltage Error
The programming voltage is supplied to the flash ROMs from the power
supply through the Controller assembly. The fault is most likely on the
Controller but can be caused by the Filter/Regulator assembly.
ROM Checksum Error
With the new firmware loaded into the Test Set’s flash ROMs, the
checksum on the ROM is tested. A faulty checksum is most likely
caused by the flash ROMs themselves or possibly the controller circuits.
In either case replace the A2A31 Controller assembly.
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