Citizen Eco-Drive b740 Instruction Manual
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Citizen Eco-Drive b740 Instruction Manual

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  • Page 1 INSTRUCTION MANUAL...
  • Page 4 IMPORTANT Before using When the watch does not operate according to the instruction manual, it is insufficiently charged. Charge the watch for more than 4 hours, approximately 20 cm (8 in.) away from the fluorescent or incandescent lamp (30 W) as light sources. When charging the watch, do not put it too close to the light source.
  • Page 5 Safety Precautions (Instructions to be followed at all times) This manual contains the following instructions that should be strictly followed at all times to prevent injury to yourself and other persons as well as damage to property. ■ Injuries and damage that might be caused by using the watch improperly or neglecting any of the instructions or precautions contained in this manual are classified with the following symbols.
  • Page 6 Request to Customers All repairs performed on this watch, excluding repairs involving the band, are to be performed at the CITIZEN. When desiring to have your watch repaired or inspected, please contact the Citizen Service Center.
  • Page 7 WARNING – Before using this watch for diving – Since the depth meter function of this watch is not approved as an official depth gauge, be sure to use this function as an auxiliary means to know the approximate depth. Diving is a sport that involves risk.
  • Page 8 WARNING Each diver should take responsibility for planning and executing his or her own diving plan to ensure safe diving. This watch is not equipped with a function that prevents decompression sickness. In addition, this watch is also unable to check differences in physiological functions of individual divers or differences in physical condition on that day.
  • Page 9 CAUTION – For safe diving – • When diving, obey the rules of the buddy system every time. (Buddy system means that two divers pair with each other for safe diving.) • For safety, it is advised that you enjoy sports diving in the depths around 20 m (60 ft).
  • Page 10 – Circumstances that prohibit use of this watch PROHIBITION in diving – Do not use this watch for diving under the following circumstances. • When the function hand indicates “NG” on the charging level index. … When the function hand indicates “NG” on the charging level, the watch will not measure the depth.
  • Page 11 Precautions in diving WARNING – Before diving – • Check to see if the watch is set to the time mode. (When the watch is set to the chronograph mode, it will not shift to the dive mode.) • Check the indication of the function hand (on the charging level index). When the function hand points to “NG”, the watch will not shift to the dive mode because of insufficient charge.
  • Page 12 In addition, do not blow highly compressed air onto the pressure sensor with an air gun. In case it is difficult to wash out dust, consult the Citizen Service Center.
  • Page 13 CAUTION – Regarding diving at high altitudes or in fresh water – • If you intend to use this watch for diving in a high place or in fresh water, be sure to have a special education in safe diving beforehand. •...

  • Page 14: Before Using

    BEFORE USING Before using, make sure the watch is sufficiently charged by exposing it to the light. A rechargeable cell is used in this watch to store electrical energy. If the watch is fully charged once, it will continue running for about two months. When the watch is used for diving (about two hours a week), it will run for about one month (until NG is indicated).

  • Page 15: Table Of Contents

    CONTENTS Safety Precautions (Instructions to be followed at all times) ....2 1. NAMES OF PARTS ................14 2. WARNING FUNCTIONS OF THIS ECO-DRIVE WATCH ....... 16 Charge level indication/Insufficient charge warning function/ Stop warning function/Time reset warning function/ Overcharge prevention function 3.
  • Page 16 11. ALL RESET/ADJUSTING HAND POSITION ......... 48 12. NOTE ON RECHARGEABLE CELL ............50 13. OTHER FUNCTIONS ................51 Rotating bezel/No decompression limits 14. PROPER CARE FOR LONG TERM USE ..........54 15. SPECIFICATIONS .................. 61...

  • Page 17: Names Of Parts

    1. NAMES OF PARTS Collate the following table with the watch diagram on the first page. Name Time mode Dive mode Chronograph mode (A): Button (A) To be pressed for selecting a mode To be pressed for showing the maximum depth (B): Button (B) left in the memory or for actuating the chronograph.
  • Page 18 a: Charge levels (LV1, LV2,NG) ..Charge level of the watch is indicated as follows (LV.1, LV.2, NG) by the function hand. These guidelines indicate whether the depth meter function is usable or not. b: Overzone mark ......When the diving depth exceeds 50 meters (125 feet) or there is something abnormal in the depth meter function, the function hand points to the overzone mark.

  • Page 19: Warning Functions Of This Eco-Drive Watch

    2. WARNING FUNCTIONS OF THIS ECO-DRIVE WATCH With decline of the charge of the watch, its warning function is activated to change the indication. [Normal indication (Time mode)] [Insufficient charge warning indication] Function hand: Points at Function hand: Points at NG. LV.2, LV.1 or NG.
  • Page 20 [Stop warning indication] [Time reset warning indication] Function hand: Points at “0”. Function hand: Points at “0”. Mode hand: Points at “0”. As the charge declines furthermore: As the watch is recharged: Irregular 2 second interval movement When the watch is sufficiently charged and the time is correctly set:...
  • Page 21 Charge level indication The function hand indicates the charge level as follows (LV.1, LV.2 and NG) to let the user know whether the watch can be used for diving or not. In the dive mode, power consumption is increased as the pressure and water sensors are activated.
  • Page 22 <When the function hand points at “LV.2” (54 seconds)> The watch is almost fully charged. Accordingly, the watch can be used reliably for diving. <When the function hand points at “NG” (58 seconds)> The watch will not shift to the dive mode because of insufficient charging.
  • Page 23 CAUTION • Use the indication of the charge level as a reference only. • If the watch is exposed to strong light for charging, the function hand may temporarily indicate “LV.1” or “LV.2” despite insufficient charging. If the function hand goes to “LV.1” or “LV.2” from “NG” position in a short time, you need to pay careful attention to charging conditions.

  • Page 24: Insufficient Charge Warning Function

    Insufficient charge warning function (Mode hand: DV position, Function hand: NG position) Whenever the power of the watch becomes insufficient 2 seconds for operation, the watch is automatically shifted to the time mode regardless of the currently set mode and the 2 seconds second hand goes for 2 second interval movement.

  • Page 25: Stop Warning Function

    Stop warning function (Mode hand: “0” position, Function hand: “0” position) If the watch is left in the insufficient charge warning indication for two days, both the mode hand and function hand will move to “0” position respectively. If the watch falls into this condition, it indicates that the watch has stopped operation completely.

  • Page 26: Overcharge Prevention Function

    Time reset warning function 2 seconds 2 seconds (Mode hand: “0” position, Function hand: “0” position) With progress in charging as the watch is exposed to light, it starts running but shows incorrect time. In this condition the second hand moves irregularly every two seconds to show that the time is incorrect.

  • Page 27: Time Required For Charging

    3. TIME REQUIRED FOR CHARGING Below are the approximate times required for charging when exposing the watch dial to light continuously. Please use this table as a reference only. Charging time (approx.) Illuminance To start working To become fully Environment To work for one (lx) normally when the...
  • Page 28 * Each time required for charging means a duration in which the watch is continuously exposed to the light indicated. To become fully charged when the cell is discharged: Time required for fully charging the watch, starting from the state that the watch has stopped operation (in the stop warning indication).

  • Page 29: Precaution For This Eco-Drive Watch

    4. PRECAUTION FOR THIS ECO-DRIVE WATCH <Always take care to charge the watch.> • Mind that the charge of the watch becomes low if you wear a jacket or a long- sleeved shirt, because the watch is usually shaded by such clothes and insufficiently charged as a result.
  • Page 30 WARNING — Note on handling the rechargeable cell — • Do not remove the rechargeable cell from the watch yourself, unless unavoidable. If you must remove the rechargeable cell, store it out of reach of children to avoid accidental ingestion. If the rechargeable cell is ingested, consult a doctor immediately.

  • Page 31: Switching Between Modes

    5. SWITCHING BETWEEN MODES • Each time button (A) is pressed for 2 seconds or more, the mode is switched from the time mode to the chronograph mode and vice versa. • If the water sensor gets wet as the watch is in time mode, the mode is switched over to the dive mode.

  • Page 32: Dive Mode

    <Dive mode> (Indication in standby status) (Depth indication) When watch is at a depth of 1 m (5 ft) or more: When button (A) is pressed for 2 seconds or more as function hand indicates “0 m” (0 ft) in depth, or When watch is function hand at a depth of...

  • Page 33: Adjusting Time And Date (Time Mode)

    6. ADJUSTING TIME AND DATE (Time mode) The watch shows time and date in the time mode. Besides time and date, the function hand indicates the power of the watch at three levels. Time (shown by hour, minute, second and 24-hour hands) and date can be checked any time regardless of the mode.
  • Page 34 How to adjust time Time can be adjusted in the time mode. (1) After turning the crown counterclockwise to unscrew it, pull the crown out to the time adjustment position (the second click stop position), the second hand will stop running.
  • Page 35 How to adjust date (1) After turning the crown counterclockwise to unscrew it, pull the crown out to the date adjustment position (the first click stop position). (2) Set the watch for the correct date by turning the crown. (3) Press the crown in to the normal position. (4) Turn the crown clockwise to screw it tightly against the case.
  • Page 36 <Note on operation of the crown> The crown of this watch is designed to be screwed down to secure the water- resistance of the watch. • For pulling out the crown for adjustment, unscrew it to get it loose first. •...

  • Page 37: Dive Mode

    7. DIVE MODE When the watch is immersed in the water, while it is set in the time mode and charged enough for diving, the water sensor senses the water and automatically switches the watch to dive mode to measure the depth. In the dive mode, the watch automatically memorizes the maximum depth of the last dive (1 data) and the user can recall it after the dive.
  • Page 38 <Depth indication> Indication range: 0 to 50 m (0 to 125 ft) deep (measured every second) Indication unit: 1 m/5 ft (Decimals of five and above in the first decimal place are rounded up and anything under five in the first decimal place is rounded down.
  • Page 39 <How to cancel the dive mode> (1) Press button (A) for 2 seconds or more after diving or in the water where it is less than 1 m (5 ft) deep (depth indication: 0 m/0 ft). The dive mode is canceled and the watch returns to the time mode.
  • Page 40 <How to recall the memorized maximum depth> (1) Press button (B) in the time mode or dive mode (when depth indication is 0 m/0 ft). The function hand indicates the memorized maximum depth. (2) To cancel the maximum depth indication, press button (B) again.

  • Page 41: Chronograph Mode

    8. CHRONOGRAPH MODE The chronograph function enables this watch to measure time in units of 1 second for a maximum of 49 minutes 59 seconds. When it has reached 50 minutes, since a time measurement was started, the chronograph stops measuring time and the hands move to the reset position.
  • Page 42 <How to measure time> (1) In the time mode, press and hold button (A) for 2 seconds or more to switch the watch to the chronograph mode. As a result, both the function hand and mode hand quickly go to their respective “0” positions and then stop. (2) Each time button (B) is pressed, both the hands start and stop alternately.
  • Page 43 * The watch cannot be switched to the chronograph mode from the dive mode. * If the function hand or/and mode hand do not reset to their respective “0” positions when the watch enters the chronograph mode or the chronograph is reset, adjust the hand(s) to the “0”...

  • Page 44: Troubleshooting

    9. TROUBLESHOOTING If the solar powered watch is insufficiently charged or power of the watch is considerably consumed, the watch functions are limited to a certain range and the watch warns the user of its status by various means such as abnormal indications.
  • Page 45 ● The second hand jumps 2 seconds every 2 seconds. This is the insufficient charge warning status that warns of a low charge of the watch. If it occurs, immediately charge the watch sufficiently. * For details, refer to “2. WARNING FUNCTIONS OF THIS SOLAR POWERED WATCH”.
  • Page 46 ● The modes cannot be switched. If the power of the watch drops, the modes cannot be switched under the following conditions. • When the function hand points to “NG”, the watch cannot be switched over to the dive mode even if the water sensor gets wet. •...
  • Page 47 ● The watch does not switch to the time mode from the depth indication. When the user climbs to a high place or is on a flight, the watch may unexpectedly be shifted to the dive mode because of a sharp change in the atmospheric pressure (pressure change equivalent to the depth of 1 m/5 ft).
  • Page 48 In that case, immediately stop using the watch and consult with the store where you purchased the watch or the nearest Citizen Service Center. ● The watch malfunctions otherwise or shows abnormal reading.

  • Page 49: Setting Function Hand At "0" Position

    10. SETTING FUNCTION HAND AT “0” POSITION (1) Set the watch to the time mode or Within ±15 graduations before/after the “0” point. chronograph mode. Turn the crown to loosen it and pull it “0” position out to the second click stop position. (2) Press button (A) or (B) to set the function hand to the “0”...
  • Page 50 * The aforementioned procedure is effectual only when the hand is located within ±15 graduations before/after the “0” point. When the hand is located outside the adjustable range, correct the “0” position of the hand referring to “11. ALL RESET/ADJUSTING HAND POSITION”. * If the watch has been left without any operation for 3 minutes or longer as the crown is pulled to the second click stop position, the function hand does not move regardless of button operation.

  • Page 51: All Reset/Adjusting Hand Position

    11. ALL RESET/ADJUSTING HAND POSITION (1) Unscrew the crown and pull it out to the second click stop position. Mode hand (2) Press buttons (A) and (B) simultaneously. If the function hand Function moves slightly, the watch is reset in hand whole.
  • Page 52 * If the ALL RESET/ADJUSTING HAND POSITION fails in clearing away the trouble, consult with the store where you purchased the watch or the Citizen Service Center about the trouble. Note that the maximum depth memorized during the last dive is...

  • Page 53: Note On Rechargeable Cell

    12. NOTE ON RECHARGEABLE CELL The rechargeable cell used in this watch is a clean energy battery that incorporates no toxic substance such as mercury inside. The rechargeable cell has no need of periodical replacement because it is capable of repeated charging and discharging.

  • Page 54: Other Functions

    13. OTHER FUNCTIONS [Rotating bezel] The rotating bezel means the rotating ring set on the rim of the watch case. An elapsed time can be checked by this rotating bezel. • How to use the rotating bezel On starting a dive, turn the rotating bezel counterclockwise to set the triangle mark ( ▽...

  • Page 55: No Decompression Limits

    CAUTION • The rotating bezel can be turned counterclockwise only, to avoid malfunction. Be careful not to turn the rotating bezel clockwise by force, otherwise the rotating bezel may be damaged. • When using the rotating bezel, you are advised to read its indication just as a guideline.
  • Page 56 No Decompression — How to read no decompression limits — Limits DEPTH.m N.D.TIME (Max. depth in meter) (No decompression time) Example: Read the 12m (40ft) ..200Min 15m (50ft) ..100Min table as follows.

  • Page 57: Proper Care For Long Term Use

    14. PROPER CARE FOR LONG TERM USE WARNING — About water-resistance — • This watch is water-resistant against water pressure at the depth of 200 m. Although the watch can be used for scuba diving with an air tank, it cannot be used for saturation diving using helium gas.
  • Page 58 For maintaining the water-resistance For maintaining the water-resistance, ask the nearest Citizen Service Center directly or through the store where you purchased the watch to inspect the watch and to replace the packing, glass, crown, etc. if needed once a year or every two years.
  • Page 59 • If the inside of the watch gets wet or the inside of the glass gets fogged and the watch does not recover from such a condition, immediately ask the nearest Citizen Service Center to overhaul it. If the watch is left in such condition, the inside will get rusty.
  • Page 60 CAUTION — For repairing the watch — • This watch must be repaired by an authorized Citizen Service Center only. CAUTION — Note on the luminous dial — • The luminous paint used for the dial of this watch is mainly made from light...
  • Page 61 CAUTION — Always keep the watch clean — • The case back and the space between the skin and watchband tend to get dirty and may get rusty. This may cause corrosion of the metal, clothes may be soiled by such dirt. To prevent this, try to keep the watch clean at all times. <How to clean the watch>...
  • Page 62 CAUTION — Operating environment — • Be sure to use the watch under specified temperatures described in this owner’s manual. If not, it may stop or malfunction. • Do not wear the watch in a hot place such as a sauna, because the watch is easily heated in such a place and you may burn your wrist and other parts of your body.
  • Page 63 • Be careful not to drop the watch on the floor, etc. • Don’t use the watch in an environment where the watch is exposed to chemicals or gases. If the watch is cleaned using thinner, benzine or other solvents (gasoline, nail-polish, creosol, bathroom cleanser, adhesive, etc.), it may cause discoloration, corrosion, dissolution or other damage to the watch.

  • Page 64: Specifications

    15. SPECIFICATIONS 1. Model ....B740/B745 2. Watch accuracy..±15 seconds per month (average) [at normal temperatures (+5°C to +35°C/+41°F to +95°F)] 3.
  • Page 65 5. Indications... . . • Time: Hour, minute, second, 24-hour, Charge level • Date • Chronograph: Minute, second (50-minute chronograph, reading in units of 1 second) • Depth gauge: 1 m to 50 m (5 ft to 125 ft) Reading in units of 1 m (2.5 ft) Depth less than 1 m (5 ft) is indicated as 0 m (0 ft).
  • Page 66 7. Duration of operation ..• From full charge to stopping of watch: 2 months approx. • From full charge to NG indication: 1 month approx. • From insufficient charge warning to stopping of watch: 2 days approx. * Duration of operation greatly varies depending on frequency of use of the depth gauge and chronograph.

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