CASIO DC7800
Instrukcja Serwisowa

Note: Perform the operation in numerical order.

User's unit Operation 1 While pushing down RESET button, press then release RESET button. 4 Press OK . Display T? (Unit emits a buzz.)

Back up unit Operation 2 While pushing down RESET button, press then release RESET button. 3 Press OK . Display R? (Unit emits a buzz.)

T? (Unit emits a buzz.) OK!

R? (Unit emits a buzz.) OK?

5 After the data transmission.... It takes a few minutes to complete the data transfer.

6 When the data is transferred properly...... In case the data transfer ends incomplete......

NG! or RESET? RESET?

7 Press RESET button. 9 Press ON .

RESET?

8 Press RESET button. 0 Press ON .

USED Note: Never press OK as it deletes all the data.

FREE Note: Never press OK as it deletes all the data.

USED

FREE

5250 60220
The above example is DC-8500 display. The numbers vary depending on the quantity of data.

5250 60220
The above example is DC-8500 display. The numbers vary depending on the quantity of data.

A Press ON (OFF).

B Press ON (OFF).

TROUBLESHOOTING
Before doing the following solutions, save data if possible.

SYMPTOM No power

CAUSE Weak battery Poor soldering of the power supply circuit

SOLUTION Replace batteries Resolder

No display at all or wrong display

Defective heat seal Defective LCD

Replace the heat seal Replace the LCD

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