Casio QT-2000 Service Manual page 59

(14) Mass RAM Read/Write test
Using the gate array and the CPU in QT-2000 circuit, the program performs RAM's mass data (in 128k byte unit)
read after write test. The program does not diagnose VRAMs.
Operation: [n][1][6][SUB TOTAL].
n = Number of execution and should be within the range of 0 to 9.
If no number or "0" is input, the test continues endlessly.
To stop the test, press [ESC].
Display: <LCD>
R/J print:
MASS
MASS RAM CHIPS : m
MASS#m
END
(15) Mass RAM backup test
The program checks if the memory contents stored in "Mass RAM read/write test" are backed up after power is
turned off then on again.
Operation: (1) After the above "RAM Read/Write test", turn the power off.
(2) After for a while, turn the power on then press [n][1][7][SUB TOTAL].
n = Number of execution and should be within the range of 0 to 9.
If no number or "0" is input, the test continues endlessly.
To stop the test, press [ESC].
Display: <LCD>
R/J print:
MASS
MASS#m
END
RAM 16
MASS RAM CHIPS : m
m= bank number
MASS#m
MASS#m OK
or "NG"
END 16
Indicates "ESC" when
the test is finished
forcibly by [ESC].
16
m= bank number
OK
or "NG"
16
prints "ESC" when the
test is finished forcibly
by [ESC] button.
MASS 17
MAS#m
m= bank number
MAS"m OK or "NG"
END 17
Indicates "ESC" when
the test is finished
forcibly by [ESC].
17
m= bank number
OK
or "NG"
17
prints "ESC" when the
test is finished forcibly
by [ESC] button.
<Dot/7-segment>
Dot/7-segment display indicates 0 only when
the test is continued from the "Dot/7-segment
0
display test." When the test is performed
indipendently, the dot/7-segment display indi-
cates nothing.
<Dot/7-segment>
Dot/7-segment display indicates 0 only when
0 the test is continued from the "Dot/7-segment
display test." When the test is performed
indipendently, the dot/7-segment display indi-
cates nothing.
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