Casio LK-90TV - Component and System Testing

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Message on LCD
2. AC adaptor check
1 Press “-” button. JOK
3. Pedal check
1 Press “1” button. TCH
2 “Sustain pedal”: ON SUS
3 “Sustain pedal”: OFF
4. ROM check
1 Press “2” button. OOK
5. MODEL check
1 Press “3” button. 649
6. ROM Ver. check
1 Press “3” button. (internal ROM) 116
2 Press “3” button. (extenal ROM) 100
7. RAM check
1 Press “+” button. AOK
8. Sound check
1 Press the “4” button. MIN
* When standing in the center, the tester hears the minimum test sound in an
equal volume from both right and left speakers.
2 Press the “5” button. MID
* When standing in the center, the tester hears the medium test sound in an
equal volume from both right and left speakers.
3 Press the “6” button. MAX
* When standing in the center, the tester hears the maximum test sound in an
equal volume from both right and left speakers.
4 Press the "7" button. L
* When standing in the center, the tester hears the maximum test sound fromthe
left speaker.
5 Press the "8" button. R
* When standing in the center, the tester hears the maximum test sound from
the right speaker.
9. LCD check
1 Press the “STEP1” button.
* All dots and characters of LCD turn on.
* There is no lack of the dot and the charater.