[MD7900 User Manual]
1.7 Cautions
— Avoid humidity. Never let water or other liquids flow into the unit.
— D on’t place the unit under direct sunlight or near heat.
— D on’t repair the unit by yourself! Bring the malfunctioned unit to our Customer Service Center
for repair.
— P revent the unit from falling down on the ground, bending or strong impact.
— D on’t apply strong detergent cleaning agents to clean the unit.
— D on’t touch the screen with sharp-headed objects.
— B efore doing reset or sending the unit for repair, please keep a copy of all important data so as to
re-input them later.
1.8 Trouble-shooting
Question : Automatic power-off period is too short, can it be changed?
Answer : Enter the automatic power-off setting mode, set the automatic power-off time longer or
set it to “0”, if you set it to “0”, the Automatic power-off will be out of function. Automatic
power-off can help you save power.
Question : Why can’t the inputting data be saved?
Answer : Perhaps there isn’t enough memory to save data, you may delete some useless data to
get enough free memory.
Question : Why can’t the unit be switched on?
Answer : (1) Perhaps the battery voltage is weak, please replace a new battery.
(2) Perhaps the method of replacing batteries is wrong, please make sure that the
polarities of the batteries are correct.
(3) Perhaps the battery compartment door is open, please close it.
(4) Perhaps the battery compartment lock is open, please push the battery
compartment
lock to the position of “lock”.
Question : Why isn’t the screen clear?
Answer : Please press the Display Contrast Control to readjust it.
Question : Why the volume is too small or too big, the speed is too slow or too fast?
Answer : Reset them in the system setting, or adjust the Volume Control on the left side of the
unit.
Question : What should I do if I forget the password?
Answer : If you forget the password, please take the unit to the local customer service center, the
staff will clear the password for you. They have the right to ask you to show your