Casio CTK-731 Service Manual page 22

Bender check
1. While pitch bender is left untouched, press "–" button.
2. Display indicates "Bender".
3. If the bender's center point is adjusted correctly, the instrument emits verification sound. If the center
point is improper, an error alarm sounds and display indicates "Bend ER" and the instrument exits
from the diagnostic program.
4. Rotate the bender all the way to the upper position.
When the program detects upper most position, it emits verification sound. If wrong direction (toward
lower position ) of bender rotation is detected, the instrument exits from the diagnostic program after
emitting an alarm sound and displaying "Bend ER".
5. Reset the bender on the center position.
A verification tone sounds.
6. Rotate the bender all the way to the lower position.
When the program detects lower most position, it emits verification sound.
If wrong direction (toward upper position) is detected, the instrument exits from the diagnostic pro-
gram after emitting an alarm sound and displaying "Bender ER".
7. Reset the bender on the center position.
The instrument exits from diagnostic program after emitting a verification sound and displaying "Bend
OK". (During and after the check, display indicates bender values until another button is pressed.)
AC adaptor detection check.
1. Press "+" button.
2. When the instrument detects that an AC adaptor is plugged in, it indicates "Jack OK" on the display.
If it judges that no AC adaptor is inserted (powered by batteries), it indicates "Jack ER" on the display.
Keyboard, Sustain pedal, and Modulation switch check
1. Press "1" button.
2. Display indicates "TouchSus".
In accordance with key, sustain pedal, or module switch depressions, display indicates velocity value
(hexadecimal values 01 to 7F), "SUS", or "Mod".
ROM check
1. Press "2" button.
2. The diagnostic program counts check sums of 8Mbit and 16Mbit ROMs.
3. In accordance with ROMs functions, display indicates;
"ROM OKOK" -------------- Both ROMs function normally
"ROM OKER" -------------- 8Mbit ROM OK, 16Mbit ROM NG
"ROM EROK" -------------- 8Mbit ROM NG, 16Mbit ROM OK
"ROM ERER" -------------- Both ROMs are NG
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