If the clock backlight is dim, it is possible the backlight control is set to L (Low).

Reference the figure below, #18 and #19 below:

 

Make sure switch #18 LIGHT is switched to ON.

Make sure switch #19 is set to H (High)

If the backlight is off, make sure the clock is plugged into AC power, and if on a switchable outlet, the switch is turned on.

 

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