Sharp Atomic Clock Spc373 User Manual -

: Hold for 3 seconds to manually toggle the 915 MHz signal reception for the outdoor sensor. Manual Time Setting

The Sharp SPC373 Atomic Desktop Clock is a popular choice for those who want "set it and forget it" accuracy. Because it syncs with the National Institute of Standards and Technology (NIST) radio signal in Fort Collins, Colorado, it maintains split-second precision.

The date digits will flash. Use to adjust, then press TIME SET .

The clock is struggling to receive the radio signal. Move the clock closer to a window facing Colorado. Keep it at least 3 feet away from electronics like computers, TVs, routers, or microwaves, which block the signal. Issue: The display is faint or hard to read.

Once batteries are in, the screen will turn on. Do not touch any buttons for at least 5 minutes. sharp atomic clock spc373 user manual

Press and hold the button for 3 seconds until the alarm hour flashes.

The hour digits will flash. Adjust the hour (ensuring the AM/PM indicator is correct), then press .

When you open the box, verify you have the following components:

Do not use rechargeable batteries (NiMH) for initial setup, as they provide lower voltage (1.2V vs 1.5V) which can hinder the signal search. : Hold for 3 seconds to manually toggle

If the temperature reads "HH.H" or "LL.L", the sensor is outside its operating range or damaged.

Automatically adjusts for Daylight Saving Time.

The Ultimate Guide to the Sharp Atomic Clock SPC373: Setup, Troubleshooting, and Manual

Pinprick button that clears all custom settings and restarts the factory software. ⏱️ Manual Time and Date Settings The date digits will flash

Insert 2 fresh AA alkaline batteries. Match the polarity diagrams (+ and -) inside the compartment. Close the Compartment: Replace the battery door securely.

Press and hold the button for approximately 3 seconds until the display flashes. Step 2: Adjust Values

Use the buttons to adjust the hour (ensure the AM/PM indicator is correct).