KeyPad service manual
Rev.1.1
If the LED is not lit, please refer the Power Circuit section and the CPU section
before changing the LED.
NOTE: Ensure that the LED has not been connected in reverse, positive to
negative.
2.2 Digital Screen Backlight is not working
Remove the bottom plate by removing the screws holding the
feet. Verify that the backlight cable is fully inserted or connected
to the “Backlight” connector (see figure 7 for detail)
Use a multimeter to measure R4 and see if it is 22 ohms.
Figure 7: Backlight and R4 location
Legend:
20. Backlight
21. R4 (22 ohms)
Please refer to the following section before changing the LCD display.
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