1. Introducción y másview
This manual provides detailed instructions for the proper use and care of your Casio G-SHOCK GA-2100BM-7A8ER Dress Watch. Please read this manual thoroughly to ensure optimal performance and longevity of your timepiece. The GA-2100BM-7A8ER is a robust and stylish watch designed for daily wear, featuring both analog and digital displays, and G-SHOCK's renowned shock resistance and 200-meter water resistance.

2. Configuración
2.1 Initial Battery Installation/Check
Your Casio G-SHOCK GA-2100BM-7A8ER watch requires one C battery for operation. The watch typically comes with a factory-installed battery. If the display is blank or functions are erratic, the battery may need to be checked or replaced. It is recommended to have battery replacement performed by a qualified watch technician to maintain water resistance.
2.2 Configuración de fecha y hora
Para configurar la hora y la fecha:
- Mantenga pulsado el AJUSTAR (arriba a la izquierda) hasta que el código de ciudad comience a parpadear. Esto indica el modo de configuración.
- Utilice el MODO button (bottom left) to cycle through the settings: City Code → DST (Daylight Saving Time) → 12/24-hour format → Seconds → Hour → Minute → Year → Month → Day.
- Utilice el COMENZAR botón (arriba a la derecha) y LUZ button (bottom right) to change the flashing value. The COMENZAR button typically increases the value, and the LUZ button decreases it (or cycles through options).
- Una vez que todos los ajustes sean correctos, presione el botón AJUSTAR de nuevo para salir del modo de configuración.

2.3 Ajuste de la banda
The watch features a durable resin band with a buckle clasp. To adjust the band for a comfortable fit, simply move the buckle pin to the desired hole on the strap. Ensure the watch is snug but not too tight on your wrist to allow for proper circulation.

3. Instrucciones de funcionamiento
3.1 Modo de navegación
Presione el MODO Botón (abajo a la izquierda) para recorrer los diferentes modos:
- Modo de cronometraje: Displays the current time and date. This is the default mode.
- Modo de cronómetro: Used for measuring elapsed time. Press COMENZAR para empezar/parar, AJUSTAR Para reiniciar.
- Modo temporizador: A countdown timer. Set the desired time using AJUSTAR y COMENZAR, luego presione COMENZAR Para empezar.
- Modo de alarma: Set up to five daily alarms. Use AJUSTAR y COMENZAR para configurar la hora de la alarma.
- Modo de hora mundial: View the current time in various cities around the world. Use COMENZAR para recorrer los códigos de la ciudad.
3.2 Uso de la luz de fondo
Presione el LUZ button (bottom right) to illuminate the watch face for easy viewing in low-light conditions. The illumination duration can typically be adjusted in the settings mode.
3.3 Resistencia al agua
Your watch is water resistant to 20 BAR (200 meters). This means it is suitable for showering, swimming, and diving. However, do not operate any buttons while the watch is wet or submerged, as this can compromise the water resistance.
4. Mantenimiento
4.1 Limpieza
Para limpiar su reloj, límpielo con un paño suave y seco. Para la suciedad difícil, utilice un paño suave.ampened with water and a mild neutral detergent, then wipe dry. Avoid using volatile agents like thinner, gasoline, alcohol, or chemical sprays, as they can damage the resin components and finish.
4.2 Reemplazo de batería
When the battery power is low, the display may become dim or functions may cease. Replace the battery promptly. It is highly recommended to have the battery replaced by an authorized Casio service center or a professional watchmaker to ensure proper sealing and maintain the watch's water resistance.
4.3 Precauciones de resistencia al agua
- No opere los botones mientras el reloj esté sumergido en agua o mojado.
- Avoid exposing the watch to hot water or steam (e.g., in a sauna or hot shower), as this can cause thermal expansion and contraction, potentially compromising seals.
- Después de la exposición al agua salada, enjuague bien el reloj con agua dulce y séquelo.
4.4 Almacenamiento
When not in use for extended periods, store your watch in a dry, cool place away from direct sunlight and extreme temperatures. Avoid storing it near strong magnetic fields.
5. Solución de problemas
| Problema | Posible causa | Solución |
|---|---|---|
| La pantalla del reloj está en blanco o tenue. | Batería baja. | Reemplace la batería. Consulte a un técnico de relojes profesional. |
| Hora o fecha incorrecta. | Time/date settings are incorrect or have been reset. | Refer to Section 2.2 "Time and Date Setting" to adjust. |
| Los botones no responden. | Watch may be in a locked mode, or internal malfunction. | Intente mantener presionado AJUSTAR for a few seconds. If unresponsive, seek professional service. |
| Fogging inside the watch glass. | Sudden temperature change or compromised water resistance. | If fog clears quickly, it's usually condensation. If it persists, water resistance may be compromised. Seek professional service immediately. |
5.1 Reinicio del reloj
In some cases, a full reset may resolve minor issues. To perform a full reset, you may need to remove the battery and reinsert it. This should only be done by a qualified technician to avoid damaging the watch or compromising its water resistance.
6. Especificaciones
- Número de modelo: GA-2100BM-7A8ER
- Fabricante: Casio
- Dimensiones del producto: 5.12 x 1.18 x 3.15 pulgadas
- Peso del artículo: 2.82 onzas
- Resistencia al agua: 20 BAR (200 metros)
- Tipo de batería: 1 C battery (Note: Typically a button cell for G-SHOCK, but JSON states 'C battery'. Follow watch markings or consult professional.)
- Mostrar: Analógico y digital
- Características: Shock Resistant, World Time, Stopwatch, Timer, Alarms, LED Light
7. Garantía y soporte
7.1 Garantía internacional
Your Casio G-SHOCK GA-2100BM-7A8ER watch comes with a Garantía internacional de 2 año. This warranty covers manufacturing defects under normal use. Please retain your proof of purchase for warranty claims. The warranty does not cover damage resulting from improper handling, accidents, unauthorized repairs, or normal wear and tear.
7.2 Atención al cliente
For technical assistance, warranty service, or inquiries regarding your watch, please contact your local authorized Casio service center or the retailer where the watch was purchased. You can find contact information for Casio service centers on the official Casio websitio: www.casio.com/support.





