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You can change the backlight on a casio wristwatch by holding the Light button, but only if it has an LED light in the side of the screen such as yours does. There is Light Blue, Red, Pink, Blue, Green LEDs in the side of the screen and you can change between them. There is also an option that flashes between all the LEDs when you press the button.
There is no design faults and no faulty lamps. Instead of lamp there is LED (light emitted diode), which is shining when the button is pressed. Click on my profile (escapement), then click on Tips and Tricks. There you will find link to RIP CURL watch manuals. If after following all instructions your watch still deliver same fault, visit your closest watch repair shop and ask to replace battery. Rate me, please..
Hold down the button at the top left (the light) for about 4 seconds. The second part of the time will start blinking. I tried this before, I'm sure, but I must not have noticed the blinking and thought nothing was happening.
Once the seconds numbers are blinking, push the top right button (Start/Stop) to move to the hour or minute. Push the bottom right button (Lap/Reset) to change the time. When you're done, push the top left button (Light) again.
First try to turn off the printer and then turn on again, if the problem still comes then uninstall the printer software and re install again, if the problem still comes then i am afraid the unit is faulty by the functionality with the button control.