Casio TE-2000 Operation Manual page 9

1. Changing Prices
1. TURN
2. DISPLAY
3. ENTER
4. PRESS
5. REPEAT
6. PRESS
7. TURN
Turn key to the PROGRAM position
Should show PGM1
New price (without using decimal point)
Preset item button that you wish to change
Steps 3 to 4 until finished
Subtotal button to finish
Key back to REG1