Casio CE-T300 Service Manual page 29

10) RAM read only check
This test will check the read only check for RAM.
Perform the RAM check (EX: command "1 and #2 " ), before start of this operation.
Operation :
[PRINT]
11) RAM read write check
This test will check the read write check for RAM.
Operation :
[PRINT]
X 5 #2 Key
X: 0= One time check.
1= Continuous check. To stop the test, set the mode switch to OFF.
NOTE: During the RAM test, the Receipt switch LED is blinking.
n 4 X 0 #2 Key
X: 0= Automatic RAM capacity detection
1= RAM1 (128K) test only
4= RAM3 (512K) test only
n: 1= Continuous check
2= In the continuous check, the print will skip when the test is no error.
4= Read only check. No writing data.
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