Casio WK-1800 Service Manual page 26

LCD test
1. Press "CURSOR ← " button.
2. Display indicates "LCD Test".
3. Each pressing of "CURSOR ← " button, displays following patterns in the following order with verifica-
tion sound.
a. All dots indication
b. No dots indication
c. Checker on 8 character block : pattern A
d. Checker on 8 character block : pattern B
e. Checker on pixel block : pattern A
f. Checker on pixel block : pattern B
g. Displays each pixel (or dot) block in turn + all dots indication
h. Displays each dot in turn + all dots indication
LED test
1. Press "CH1" button.
2. Display indicates "LED Test" and LEDs illuminate in the following order with verification sound.
a. FULL RANGE CHORD
b. FINGERED
c. CASIO CHORD
d. SONG
e. PATTERN
f. FREE SESSION
g. SYNTH
h. DISK
FDD test
1. Press "DISK" button.
2. Display indicates "Dsk0-9E" (which means numeral key 0 to 9 and ENTER button.)
This test executes floppy disk's write/read test and entering a number selects sectors to be tested.
Larger the number, narrower the check area namely, entering 0 checks all the sectors of the disk.
3. Press "ENTER" button to clean the FDD with cleaning disk. Wet type cleaning disk is recommended.
To exit from the diagnostic program
Pressing "CURSOR ↓ " button sets the instrument in Reset power off state.
If you wish to use the instrument continually after this diagnostic program, perform "System reset" de-
scribed below.
— 25 —