Seiko F221A – Parts List

1. Main Circuit Board Assembly

   • Quartz oscillator

   • IC chip (microcontroller)

   • LCD driver

   • Power management circuitry

2. LCD Display Module

   • Segmented liquid crystal display for time, date, alarm, stopwatch, and indicators

   • Display glass or plastic panel

3. Battery Contacts

   • Positive terminal contact

   • Negative terminal contact

   • Battery holder frame

4. Buttons (Pushers)

   • Mode button (cycles modes)

   • Set/Adjust button (enters settings, confirms changes)

   • Start/Stop/Advance button (adjusts digits, operates stopwatch)

   • Light button (activates backlight)

5. Backlight Assembly

   • Electroluminescent (EL) panel or LED light source

   • Light diffuser (if applicable)

   • Light contacts and wiring

6. Quartz Crystal Oscillator

   • Frequency reference component

7. Vibration Motor (if applicable)

   • For silent alarms (less common in this model)

8. Flex Cable / Connectors

   • Connections between circuit board and LCD

   • Connections for buttons and backlight

9. Gaskets and Seals

   • Water-resistant seals around caseback and buttons

10. Miscellaneous Components

    • Screws and mounting hardware

    • Insulation pads

    • Shielding plates (for electromagnetic interference protection)