How to Set Time on a Sharp Atomic Wall Clock

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Sharp Electronics makes good-looking atomic wall clocks, both analog and digital. But if you lose your instructions, you are out of luck, as the company's support site hides replacement manuals as if they are state secrets. Heroic reviewers on Amazon.com have ridden to the rescue of Sharp clock owners though, with the essentials you need to know.

Step 1

Pull the battery out, noting which end is positive, as indicated by the "+" symbol. On the Sharp SPC890 Quartz Analog Atomic Wall Clock, for example, the battery is a single AA cell that slots into a compartment without a cover, so it's readily accessible.

Step 2

Wait five minutes and reinsert the battery, with the correct polarity. On the SPC890, the "+" will be on the right as you look at the compartment. Wait for the clock hands of the analog model or the readout of the digital model to go to 8 a.m.

Tip

  • Look for a plastic tab above and to the left of the battery compartment. This is called the leverage button. If present, press the button after inserting the battery and hold it down until the hands advance to the correct time, and then release. The clock's radio monitor will still scan for signals to attain perfect accuracy.

Step 3

Repeat this process if your clock doesn't advance correctly during switches from Daylight Savings to Standard time.

Troubleshooting Tips

  • If your clock is off by one to three hours, but the minutes and seconds are correct, press the time zone buttons. These may be marked ET, CT, MT and PT, for the Eastern, Central,  Mountain and Pacific time zones.
  • If your Sharp clock is off in terms of minutes and seconds, relocate it near a window facing Fort Collins, Colorado, the source of radio signals from NIST Radio Station WWVB. You can also try removing the clock from its hanger and testing it on a wall at 90 degrees to the initial wall, or moving it away from a computer monitor that may also be on the 60 kHz band. 
  • Install a fresh battery if your multimeter test of the current battery shows that it is weak.
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