: If the display is glitchy, use a paperclip to press the RESET button on the back. This wipes current settings and forces a fresh search for the atomic signal.

Setting up the SPC373 is remarkably straightforward, but patience is key for its first synchronization.

Once your settings are saved, the clock begins its search. The SPC373 is designed to receive the WWVB time signal broadcast from Fort Collins, Colorado.

Is the flashing, solid, or missing entirely?

Even with a reliable device, problems can occasionally arise. Below are some of the most common issues users face, along with practical fixes.

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Replace both AA batteries with brand-new, name-brand alkaline batteries. The buttons are completely unresponsive.

When the alarm sounds, tap the large SNOOZE/LIGHT button on top of the clock. The alarm will pause for approximately 5 minutes before sounding again.

Atmospheric interference or physical obstacles are blocking the WWVB radio waves.

Atmospheric interference drops significantly at night, making synchronization much more reliable during these hours. Troubleshooting Guide Issue: The clock time is exactly one or more hours off.

Don't forget to check the to ensure you aren't waking up at 6:00 PM instead of 6:00 AM! ❓ Troubleshooting Common Issues

Press the AL_ON/OFF switch again. The bell icon will disappear. 💤 Using the Snooze and Backlight

Unlike a standard quartz clock, the SPC373 requires you to set your local parameters before it locks onto the atomic signal.

: Receives daily updates to remain accurate within one second. Full Information Display

The controls are likely on the back or top of the main unit.

| Problem | Possible Cause | Solution | |---------|----------------|----------| | Clock not syncing | Weak WWVB signal | Move clock to a north-facing window at night. Remove from near TV, router, phone charger. | | Wrong hour (off by 1) | DST setting wrong | Check DST setting in manual mode. Set to AUTO. | | Display faint or blank | Low batteries | Replace all batteries with fresh alkalines. | | Alarm doesn't sound | Alarm disabled | Check for bell icon on display. Press ALARM 1 or 2 to re-enable. | | Humidity reads “---” | Sensor error | Remove batteries for 1 minute, reinsert. | | Buttons unresponsive | Unit frozen | Press reset button (pinhole on back) with a paperclip, or remove batteries for 10 minutes. | | Time is off by hours (not minutes) | Time zone set incorrectly | Go to manual setting and verify time zone (P, M, C, E). |