The Seiko V231A is a solar-powered analog-digital quartz movement that combines the aesthetic appeal of traditional analog timekeeping with the practical versatility of digital display functions. Designed for field, sports, and everyday watches, the V231A is part of Seiko’s hybrid solar movement lineup, offering users a feature-rich experience with eco-friendly, maintenance-free operation.

Overview

The V231A movement builds upon the foundation of Seiko’s earlier analog-digital calibers such as the V230A/B, introducing refinements in power efficiency, display responsiveness, and function control. It features central hour, minute, and second hands, alongside a multifunction digital LCD display that provides access to stopwatch, alarm, dual time, and calendar tools.

Powered by solar energy, the V231A eliminates the need for traditional battery replacement, storing energy in a rechargeable capacitor that can power the movement for up to 6 months on a full charge. This makes it an ideal movement for users who expect reliability, versatility, and long-term performance from their watches.

Key Features

• Solar Charging System: Converts light into electrical energy, stored in a long-life capacitor.

• Analog Time Display: Hour, minute, and seconds hands (center-mounted).

• Digital Functions via LCD Display:

  • Time (12/24-hour format)

  • Stopwatch (Chronograph)

  • Daily Alarm

  • Second Time Zone (Dual Time)

  • Auto Calendar

• Electro-Luminescent (EL) Backlight: Illuminates digital screen in the dark.

• Low Power Indicator: Analog second hand ticks at 2-second intervals when power is low.

• Hacking Function: Stops the second hand when the crown is pulled out.

• Power Reserve: Approximately 6 months on full charge.

Technical Specifications

• Caliber: Seiko V231A

• Movement Type: Solar-Powered Analog-Digital Quartz

• Rechargeable Cell: Seiko capacitor (not interchangeable with silver oxide batteries)

• Accuracy: ±15 seconds per month

• Power Reserve: Up to 6 months (on full charge)

• Chronograph Function: Up to 60 minutes, 1/100-second resolution

• Alarm: One programmable daily alarm

• Calendar: Fully automatic, pre-programmed

• Dimensions:

  • Diameter: Approx. 30.0 mm

  • Thickness: Approx. 6.0 mm

• Hand Hole Sizes:

  • Hour: 1.10 mm

  • Minute: 0.65 mm

  • Second: 0.20 mm

Controls and Operation

Crown Positions:

• Position 0 (Pushed In): Normal operation.

• Position 1 (Pulled): Set analog time (hacks second hand). Analog and digital times are independent.

Push Button Functions:

• Button A (Top Left): Cycle through modes (Time → Chronograph → Alarm → Dual Time → Calendar)

• Button B (Top Right): Start/Stop in stopwatch, increase value in setting mode

• Button C (Bottom Left): Reset in stopwatch, or activate EL backlight

• Button D (Bottom Right): Enter setting mode or toggle 12/24-hour format

This design ensures simple, intuitive access to all functions.

Charging Instructions

• Sunlight (10,000 lux):

  • Full charge: ~10–15 hours

  • 1-day use: ~3 hours

• Indoor Light (500 lux):

  • Full charge: Several days

• Avoid overexposure to direct heat or sunlight at high temperatures (e.g., car dashboards).

Maintenance and Servicing

• Battery Replacement: Only use genuine Seiko capacitors; never replace with silver oxide cells.

• Circuit Reset: No manual AC reset needed—V231A auto-initializes after full charge or capacitor change.

• Solar Panel Care: Keep dial surface clean to maintain light conversion efficiency.

• Water Resistance: Always replace caseback gasket and push-button seals after service and perform pressure testing.

Common Issues

• 2-Second Tick: Indicates low power; recharge under bright light.

• Digital Screen Blank: Likely a fully drained capacitor—requires several hours of strong light to reactivate.

• Buttons Unresponsive: Clean button contacts; inspect for dust, wear, or rubber degradation.

• Analog and Digital Times Not Matching: This is normal behavior; adjust separately.

• EL Backlight Dim: EL panel may be aging—replacement requires full module service.

Conclusion

The Seiko V231A is a well-rounded hybrid solar movement offering a balance of analog elegance and digital functionality. With its integrated chronograph, alarm, dual time, and calendar features—plus a highly efficient solar power system—it is a dependable solution for watchmakers and consumers alike. Designed for long-term use with minimal servicing, the V231A provides modern utility in a timeless, practical format.