Casio 130CR Service Manual page 21

Battery test
Operation :
All the fonts are printed.
US (Total of 14 digits)
Time display test
Operation :
Time is displayed until the clear key is pressed or a power down occurs.
Ending the test mode
To leave the test mode, remove the battery (AUTO MAC).
8 ST (SUB TOTAL)
Other than US (Total of 12 digits)
Blank line
9 ST (SUB TOTAL)
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