Sharp Atomic Clock Spc373 User Manual Site
The manual provides a slim troubleshooting section:
Problem: Clock never sets to correct time.
Solutions:
Problem: Temperature reading is wrong.
Solutions:
The SPC373 has two independent alarms. This is useful for partners with different wake times or a weekday/weekend split.
Arthur’s fingers trembled as he unfolded the worn trifold paper. It wasn’t just any paper. It was the Sharp SPC373 Atomic Clock User Manual, and it was the last one on Earth.
The clock itself—a bland, grey plastic rectangle—sat on his dust-covered coffee table, its LCD screen blank. For three years, since the Great Signal Collapse, no one had cared about atomic time. Without the WWVB radio signal from Fort Collins, the “atomic” feature was a lie. People threw their “smart” clocks into landfills. They’d gone back to sundials and wristwatches.
But Arthur was a restorer. He was also desperately lonely.
He squinted at Section 4: Manual Setting (When Atomic Signal is Unavailable).
“Step 1: Press and hold the ‘SET’ button for 3 seconds,” he read aloud, his voice cracking from disuse.
He pressed. The seconds display began to blink. Hope, a tiny green shoot, broke through the concrete of his despair.
He followed the manual like a sacred text. Step 4: Use the ‘UP’ button to set the year. He set it to 2026, though everyone else called it “Year 4 of the Drift.” Step 7: Set the DST to ‘OFF’ permanently.
It took him an hour to fumble through the time, the date, the 12/24-hour format. The manual’s diagrams were cryptic—little icons of suns and moons that seemed to mock him. But on page two, a footnote saved him: Note: When the battery is low, the display will show a flashing ‘BAT’ icon.
He replaced the AA batteries. Suddenly, the second hand (a phantom on the digital readout) began to tick.
He held the clock to his ear. Tick. Tick. Tick.
It was the only metronome in a silent world. He placed it back on the table, and for the first time in years, he knew what time it was: 4:17 PM.
He wasn't just measuring hours. He was measuring his survival.
Then, a miracle. At precisely 2:00 AM, as promised on page 3, the clock attempted a signal sync. The antenna icon flickered. Arthur held his breath. The world’s atomic clocks had long been silent… or so he thought. sharp atomic clock spc373 user manual
The icon stopped flickering. The clock displayed 12:00 AM—the signal was dead.
But the manual had a final instruction, hidden in the safety warnings: Do not expose to extreme temperatures, direct sunlight, or despair.
Arthur smiled. He didn't need Fort Collins. He had the manual. He had the buttons. He had the small, stubborn power of setting time himself.
He set the clock to 6:00 AM—a new beginning. Then he stepped outside, the Sharp SPC373 tucked under his arm, to teach his neighbors how to wind their broken watches again.
Table of Contents
1. Introduction
Congratulations on purchasing the Sharp Atomic Clock SPC373! This user manual will guide you through the easy operation and maintenance of your new clock. The Sharp Atomic Clock SPC373 is a highly accurate and reliable timekeeping device that receives atomic time signals from Germany and Japan to ensure precise timekeeping.
2. Features
3. Installation
4. Operating Instructions
5. Atomic Timekeeping
The Sharp Atomic Clock SPC373 receives atomic time signals from Germany (DCF77) and Japan (JJY) to ensure precise timekeeping. The clock automatically synchronizes with the atomic time signal at midnight, 2 AM, 4 AM, 6 AM, and 8 AM every day.
6. Time Zone Setting
The Sharp Atomic Clock SPC373 has a built-in time zone setting. You can set the clock to display the time in one of the following time zones:
To set the time zone:
7. Alarm Setting
The Sharp Atomic Clock SPC373 has a single alarm function. To set the alarm:
8. Snooze Function
The snooze function allows you to temporarily stop the alarm and resume it after a set period.
9. Backlight
The Sharp Atomic Clock SPC373 has a built-in backlight for easy reading in the dark.
10. Troubleshooting
11. Maintenance
12. Specifications
13. Warranty Information
The Sharp Atomic Clock SPC373 is backed by a 1-year limited warranty. For more information, please refer to the warranty card included with your purchase.
The Sharp SPC373 Atomic Clock is designed to synchronize automatically with the WWVB radio signal from Fort Collins, Colorado.
Below is a guide to its key functions, compiled from the available manual details: Initial Setup & Synchronization
Battery Installation: Insert 3 AAA batteries into the main unit and fresh batteries into the remote sensor, ensuring correct polarity.
Syncing: The clock may take up to 24 hours to catch the atomic signal. For the best reception, place the clock near a window overnight.
Time Zone: Press the Time button once until the time zone flashes. Use the Up/Hour button to cycle through (P-Pacific, M-Mountain, C-Central, E-Eastern) and press Time again to confirm. Button Functions Time: Hold for 2 seconds to enter manual time setting mode.
Up: Increases values during setup; hold for 3 seconds to manually force a radio signal (RC) reception test. The manual provides a slim troubleshooting section: Problem:
Down: Decreases values or switches between 12/24-hour formats.
Max/Min: Displays the highest and lowest recorded temperatures; hold for 3 seconds to clear these records. ALM ON/OFF: Activates or deactivates the alarms.
Sync: Hold for 3 seconds to manually toggle the 915 MHz signal reception for the outdoor sensor. Manual Time Setting
If the clock cannot receive a signal, you can set it manually:
Press and hold the Time button for 2 seconds until the hour flashes.
Use the Up/Down buttons to adjust the hour (ensure the AM/PM indicator is correct).
Press Time again to move to minutes, year, month, and date, using the Up/Down buttons for each. Press Time one last time to save and exit. Troubleshooting the Outdoor Sensor If the outdoor temperature is not registering:
Check Batteries: Ensure the remote sensor batteries are fresh and the contacts are free of corrosion.
Re-Sync: Press and hold the Sync button on the back of the clock to re-establish the connection with the transmitter.
Placement: Keep the sensor within range and away from large metal obstructions that might block the 915 MHz signal.
For a printable copy of the original instructions, you can visit the MZB Instruction Manuals page, which is the official distributor for Sharp clocks. Sharp SPC373 Atomic Clock Troubleshooting Guide
| Pros | Cons | |------|------| | ✅ Truly set-and-forget once synced | ❌ No manual time setting – useless if atomic signal fails | | ✅ Large, easy-to-read digits | ❌ 12-hour only – no 24-hour mode | | ✅ Auto DST adjustment | ❌ No backlight always-on option | | ✅ Affordable (~$20–$25 USD) | ❌ Flimsy plastic stand (manual advises “gentle handling”) |
If you cannot receive the atomic signal (e.g., remote area, interference), set the time manually.
Button reference (exact labels may vary slightly – typical for Sharp):
Congratulations on your purchase of the Sharp SPC373 Atomic Clock. This device represents a fusion of traditional analog aesthetics and 21st-century radio-controlled accuracy. Unlike standard quartz clocks that can drift seconds per month, the SPC373 synchronizes itself daily with the atomic clock of the National Institute of Standards and Technology (NIST) in Fort Collins, Colorado (or equivalent regional transmitters in Europe/Japan for export models).
This manual will guide you through installation, feature utilization, and maintenance to ensure your clock remains accurate to within one second per million years. Problem: Temperature reading is wrong
To ensure your Sharp SPC373 lasts for years: