Method of self-diagnosing a mobile telephone set for use in a mo

Details Method of self-diagnosing a mobile telephone set for use in a mo Method of self-diagnosing a mobile telephone set for use in a mo

1992-05-28

1997-07-01

Woo, Stella

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 1, 379 32, 455 671, 455 674, 371 204, H04M 124, H04M 322, H04B 1700, G01R 3128

Patent

active

056446187

ABSTRACT:
A self-diagnosing method that shortens the diagnosing time for a ROM, which is provided within a mobile telephone set for use in a mobile telephone switching system, and the method being applied to a mobile telephone set. When the power supply is turned ON, data which is stored within a specific address of the ROM (ROMCHK), having a complementary value which complements the sum of data stored within all the addresses of the ROM to provide a certain specific value, is compared with data which was previously stored within a specific address of the non-volatile memory (NVMCHK), having the same value as the ROMCHK. If the contents of the two data do not coincide, then the content of the data within the entire area of the ROM is calculated for the diagnosis. In this case, the content stored within the specific address of the ROM is the sum of the data values within the entire area of the ROM, and the content stored within the specific address of the non-volatile memory is the same as this sum value.

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