Introducció
This manual provides essential information for the proper use and maintenance of your CASIO G-Shock GW-8900A-1JF watch. This timepiece combines G-Shock's renowned shock resistance with Tough Solar power and Multi-Band 6 atomic timekeeping for reliable and accurate performance. Please read this manual thoroughly to ensure optimal operation and longevity of your watch.
Característiques clau
- Multi-Band Atomic Timekeeping: Automatically receives time calibration signals from six transmission stations around the world for accurate timekeeping.
- Energia solar resistent: Converts light into power, eliminating the need for battery replacement.
- Resistent a cops: Dissenyat per suportar impactes i vibracions.
- Resistent a l'aigua de 200 m: Suitable for swimming, showering, and water sports.
- Full Auto EL Backlight with Afterglow: Illuminates the display in low light conditions.
- Hora mundial: Mostra l'hora actual a les principals ciutats i zones específiques del món.
- Alarmes: Includes 4 daily alarms and 1 snooze alarm.
- HourlSenyal horari: An audible alert every hour on the hour.
- Cronòmetre d'1/100 de segon: Per mesurar el temps transcorregut.
- Temporitzador de compte enrere: Per a esdeveniments de cronometratge.
- Calendari automàtic complet: Preprogramat fins a l'any 2099.
- Formats de 12/24 hores: Choose between standard and military time displays.
- Button Operation Tone On/Off: Option to mute button sounds.
- Indicador d'alimentació de la bateria: Mostra el nivell de càrrega actual.
- Funció d'estalvi d'energia: Conserves power when the watch is left in the dark.
Configuració i configuració inicial
1. Càrrega inicial
Your G-Shock GW-8900A-1JF is equipped with Tough Solar power. Before initial use, expose the watch face to bright light (sunlight or strong artificial light) for several hours to ensure it is sufficiently charged. A fully charged battery can last approximately 9 months without further light exposure under normal use, or up to 26 months with the power-saving function enabled in total darkness.

Imatge: Frontal view of the CASIO G-Shock GW-8900A-1JF watch. The watch face features a digital display with time, date, and day indicators, surrounded by a robust black resin case and strap. The solar panel is integrated into the watch face.
2. Time Calibration (Atomic Timekeeping)
The watch automatically receives time calibration signals. For optimal reception, place the watch near a window at night. Manual reception can also be initiated:
- En el mode de mesura del temps, manteniu premuda la tecla AVANT button for about two seconds until the current Home City code flashes.
- Premeu el botó AJUSTAR button to cycle through settings until you reach the RCVD (Receive) setting.
- Premeu el botó INICI/PARA button to initiate manual reception. The watch will attempt to receive the signal.
- Once reception is complete, the time will be adjusted automatically.
3. Setting Home City and Time Zone
To manually set your Home City and adjust for daylight saving time (DST):
- En el mode de mesura del temps, manteniu premuda la tecla AJUSTAR fins que el codi de la ciutat comenci a parpellejar.
- Utilitza el INVERSA i AVANT buttons to select your desired Home City code.
- Premeu el botó MODE button to cycle through other settings like DST, 12/24-hour format, year, month, day, hour, minute, and second.
- Utilitza el INVERSA i AVANT botons per canviar el valor intermitent.
- Premeu AJUSTAR per sortir de la pantalla de configuració.
Modes de funcionament
Premeu el botó MODE button to cycle through the different modes:
- Mode d'indicació de l'hora: Mostra l'hora i la data actuals.
- Mode hora mundial: Displays the current time in 48 cities (31 time zones). Use INVERSA i AVANT a view different city times.
- Mode de cronòmetre: Mesura el temps transcorregut. Prem INICI/PARA per iniciar/aturar, INVERSA per reiniciar.
- Mode de temporitzador de compte enrere: Counts down from a preset time. Set the countdown time using AJUSTAR i INVERSA/AVANT. Premeu INICI/PARA per començar.
- Mode d'alarma: Set up to 5 independent daily alarms. Use INVERSA i AVANT to select an alarm, then AJUSTAR per configurar l'hora de l'alarma.
EL Backlight Operation
Press the large front-mounted LLUM button to illuminate the display. The backlight features an afterglow, remaining lit for a short period after the button is released.

Imatge: Anglesa view of the CASIO G-Shock GW-8900A-1JF watch, highlighting the robust case and the various function buttons on the sides, including the large front-mounted light button.
Manteniment
Càrrega del rellotge
To maintain optimal battery charge, expose the watch face to light regularly. Avoid prolonged storage in dark places. The battery power indicator will show the current charge level. If the indicator shows a low charge, place the watch in a bright area.
Resistència a l'aigua
This watch is 200-meter water resistant. This means it is suitable for recreational scuba diving, swimming, snorkeling, and other water sports. Do not operate buttons while the watch is submerged in water or wet.

Image: The CASIO G-Shock GW-8900A-1JF watch partially submerged in water, demonstrating its 200M water resistance. Water droplets are visible around the watch.
Neteja
Wipe the watch with a soft, dry cloth. If it becomes dirty, use a soft cloth dampEsbandiu amb aigua i un detergent neutre suau i, a continuació, eixugueu. Eviteu utilitzar agents volàtils com ara dissolvent o benzina, ja que poden danyar els components de resina.
Resolució de problemes
- Time is incorrect or not syncing: Ensure the watch is exposed to light for charging. Try manual time signal reception, especially near a window at night. Verify your Home City setting is correct.
- La pantalla està tènue o en blanc: The watch may be in Power Saving mode or the battery charge is low. Expose the watch to bright light.
- Els botons no responen: Ensure the watch is not in a mode that locks buttons (e.g., some settings modes). If submerged, wait until dry before operating buttons.
Especificacions
| Número de model | GW-8900A-1JF |
| Dimensions | 2.07 x 0.64 x 2.17 polzades |
| Pes | 2.6 unces |
| Resistència a l'aigua | 200 metres (20 caixers automàtics) |
| Font d'alimentació | Tough Solar (Solar rechargeable battery) |
| Durada de la bateria (aprox.) | 9 months on full charge (without light exposure), 26 months with Power Saving function. |
| Senyal de calibració del temps | Multi-Band 6 (Automatic reception up to 6 times a day) |
Vídeo oficial del producte
Vídeo: Presentació oficial del producte en vídeoasing the CASIO G-Shock GW-8900A-1JF watch, highlighting its design, features, and durability. This video provides a dynamic view del rellotge des de diversos angles.
Garantia i Suport
For warranty information and customer support, please refer to the warranty card included with your purchase or visit the official CASIO G-Shock weblloc web. Conserveu el comprovant de compra per a qualsevol reclamació de garantia.





