Casio CE-300 (EX-247) Service Manual page 16

3. Individual function test
3-1. Series test
"Y" "X" "1" + "#2" key
Y: 0: Normal test
1: Execute next test even if an error happend at ROM check sum
X: 0: Autockecking of RAM capacity
1: 256 Kbit RAM test
2: 1 Mbit RAM test
Execute the following test in order.
1. Display test
2. Check sum test of EP-ROM
3. RAM test
4. Drawer open test
5. Printing test
6. Date and Time test
1. Display test (All segment light on)
2. Ckeck sum test of EP-ROM
Normal end
ROM SUM
XX00: Check sum value
3. RAM test (Read/Write test)
Normal end receipt
256 Kbit RAM
RAM 32K
Error end receipt
RAM 32K
4. Drawer open test
5. Printing test
BBBBBBBBBBBBBBBBBBBBBBBB
6. Date and Time test
Set the date and time as follows.
Date : 31 / 12 / 96
Then, issues a receipt and display the following character.
1 2. 3 4 5. 6 7 8. 9 0
OK
R/W OK
YY:
E R
XXXX: Address
Time : 25:59
— 14 —
Error end
ROM E R
XXXX : Check sum value
1 Mbit RAM
RAM 128K R/W
Bank
OK