3-2 Transistors ........................9 3-3 Coils ..........................9 3-4 Oscillators/Quartz ......................9 4. Accuracy Setting Method for Casio Watches ........... 10 4-1 Accuracy Setting by Capacitor/Trimmer ..............10 4-2 Accuracy Setting by Pad Selection ................11 4-3 Digital Tuning (Pattern Cutting) Method ..............11...
6. Quality Evaluation and Replacement of EL ............12 7. Names of Casing Parts ..................14 7-1 G-Shock ........................14 7-2 Baby-G ......................... 15 7-3 Twincept ........................16 7-4 Data Bank ........................17 7-5 Diver's Watch ....................... 18 7-6 Watches Equipped with a Sensor/Pressure (Side Sensor) ......... 19 7-7 Watches Equipped with a Sensor/Pressure (Front Sensor) ........
FLOW CHART FOR REPAIR OF MODULE WITHOUT MOVEMENT (RANKS A AND B) Module without Movement is broken What is wrong ? EL doesn’t light Display trouble Sensor trouble Refer to 6. Quality Sensor/magnetic Sensor/pressure ? evaluation and Sensor/magnetic ? replacement of EL Sensor/pressure Refer to 11.
FLOW CHART FOR REPAIR OF MODULE WITH MOVEMENT (RANKS A AND B) Module with Movement is broken What is wrong ? Hands are not EL doesn’t light Sensor trouble moving Refer to 6. Quality Sensor/magnetic Sensor/pressure ? Battery have evaluation and Sensor/magnetic ? much power replacement of EL...
FLOW CHART FOR REPAIR OF CASING PARTS (RANKS A AND B) The casing parts of watch is broken What is wrong ? Band or Dial are Case/Center ass'y is Alarm doesn't broken broken sound Refer to Watch Which part is Basic Repair Manual Refer to 8-4.
1. Circuit Explanation of Quartz Watches The basic circuits employed in quartz watches are as described below. Nearly all portions of these circuits are contained in the LSI, and therefore cannot be repaired. (Fig. 1-1) However, they are important in terms of understanding the operating principle of the quartz watches. 1-1 Circuit Diagram Fig.
1-2 Digital Quartz Watches Power Unit (Battery): There are two types of batteries: a battery/lithium (3.0 V, mainly used in digital watches), and a battery/ silver oxide (1,55V, mainly used in analog watches). In addition, since the driving voltage of the LCD driver is 3 V and that of the oscillator is 1.5 V, a voltage halver (for the oscillator) is provided in the LSI of the modules using a battery/lithium, while a voltage doubler (for driving the LCD) is provided in the LSI of the modules using a battery/silver oxide.
Stepping Motor: This is composed of a coil, stator and rotor. This motor turns the rotor 180 degrees per second when the 1 Hz alternating current signal is received from the coil driver, resulting in rotation of the gears of the train wheel unit.
The measurement procedure is described below. 1) Remove the cover/back and take out the battery. (Use a plastic tweezers or finger stall.) 2) After checking that the battery still has sufficient charge with a battery checker, place the battery on the plate/main of the module with the plus side facing down. 3) After setting the measurement range of the analog multimeter to an alternating current range of 30 or 50 µA, place the plus end of the probe (colored red) on the battery (minus side) and place the minus end (colored black) on the battery contact (–) of the module/with movement.
3-2 Transistors In watches, transistors are mainly used to perform signal amplification in the alarm (BD) and EL (LD) drive circuits. Evaluation of their quality is performed as described below. 1) Remove the transistor to be inspected from the P.C.B. 2) Set the multimeter to the 1 KΩ...
This accuracy setting procedure is naturally also required when a oscillator/quartz has been replaced during repairs. The following provides a description of the accuracy setting method for Casio watches. 4-1 Accuracy Setting by Capacitor/Trimmer Tool used NO. Code No.
4-2 Accuracy Setting by Pad Selection The capacitance of the capacitor in the LSI can be changed to nine different levels by combining the Oscillator/Quartz open and shorted states of pads G1-G3 of the PCB ass’y. (Fig. 4-3) These changes in capacitance can be used to ad- just the accuracy.
5. LCD Replacement Tool used NO. Code No. Tool name 1904 5153 HP-fingerstall (two set) 1901 9672 Precision screwdriver set 1901 9523 Precision tweezers 1901 9519 Blower brush When the LCD is missing characters, there are many cases in which this is repaired by replacing the LCD. In addition, the LCD is also replaced when it is cracked.
1) Materials Used a) One module equipped with an EL (transformer up-conversion type) QW-1199/1219/1298/1188/1289/1431/1433/ 1299/1441/1557 or equivalent modules b) Two alligator clips (with lead wires) 2) Disassemble the module and remove the PCB ass’y. 3) Solder one of the lead wires of the alligator clips to the SE terminals of the four terminals to which the transformer is soldered on the PCB ass’y.
8. Replacement of Casing Parts 8-1 Glass Replacement Tool used NO. Code No. Tool name 1904 5153 HP-fingerstall (two set) 1901 9439 Buckskin 1901 9522 Hand press Mineral glass is used in models having water resistance up to 200 meters, and the glass can be replaced. Parts information for the glass is contained in parts lists (P/L, P.P.L.).
8-2 Button Replacement If a watch has been dropped or bumped on hard object, a button may be damaged or a button shaft may become bent by the impact. If this happens, it is necessary to replace the button since it may no longer operate or water may enter through the space around the button resulting in defective water resistance.
Casio are only available as separate parts for those register rings of the MD, LD and AD series. In this case, order all three parts from Casio and assemble them into a single unit before installing on the watch.
1) Remove the old piezo from the cover/back (first Cover/Back Hand press take out the piezo from the cover/back using a case opener A and then clean by wiping with alcohol). 2) Have available the new piezo and the tape/adhe- sive (thermal compression bonding type).
b) When putting the analog block down, place it with the shaft side facing up (to prevent the shaft of the wheel/second from breaking). c) Since small particles of dust trapped between the gears can cause modules/with movement, and particularly plastic movements, to stop, in addition to keeping the location where repair work is performed as clean as possible, an effort should also be made to blow the analog block with the blow brush several times during the course of repair work.
In addition, since plastic cases are used in many Casio watches, even when these cases appear to be free of any damage, water may enter the watch which is through the micro-cracks result of the watch being subjected to excessive shock during use.
10-1 Water Resistant Tester This tester is used to determine the locations of water penetra- tion in watches that have been judged to have defective water resistance. Thus, this instrument is also useful since it is able to determine what part should be replaced in the case of defective water re- sistance.
The following is the instruction of one of the air leak checker WPC-8002 which is delivered by CASIO. WPC-8002 measure the air leakage of the watch by using the sensor which detects the glass defor- mation.
10)Wait about one minute for the judgment of the air tightness. In case the watch has no air leakage The hand of the indicator will moves to left side at first, and it will be back to center (zero point) approx.
10-3 Water Pressure Tester and Hot Plate Waterproof inspections are inherently performed using this method. In addition, differing from the water resistant tester and air leak checker, since this instrument allows pressurization up to 20 bar, this instrument is used to perform inspections in the case of inspecting the inherent level of water resistance of the G-Shock and Diver's Watch models.
Note1: Set the temperature of the hot plate approx. 60 Note2: In case the hot plate HM-11 which is delivered by CASIO is used, place the silicone rubber with thermo tape for the prevention of excessive heating to the watch.
When any of these malfunctions occur, however, replacement is usually performed with a module with sensor (on which trimming has been performed at the Casio factory). However, when a Sensor/pressure trimming jig set is available, repairs can be performed by replacing the individual sensor or adjusting the sensor.
11-1 Trouble Shooting with Sensor/Pressure Trimming Jig Set Change the display to barometer mode Check the Finish display No good The value is Display shows Display shows inaccurate "FULL" "SENSOR ERROR" Check the Read and write connection of FPC or down the value springs/coil of the sensor...
11-2 Trouble Shooting without Sensor/Pressure Trimming Jig Set Change the display to barometer mode Check the Finish display No good The value is Display shows Display shows inaccurate "FULL" "SENSOR ERROR" Check the Read and write connection of FPC or down the value springs/coil of the sensor...
Consequently, when using the altim- eter (relative altimeter) of a Casio watch, it is necessary to set the refer- ence altitude (0 meters or the altitude value for that location) according to the instruction manual for each use.
1901 9401 Solder 1901 9519 Blower brush The sensors/magnetic used in Casio watches equipped with an electronic compass consist of mag- netic resistance (MR) devices in which the resistance value changes in response to the effects of the earth's magnetism.
If any of the resistance values are found to be abnormal, the sensor/magnetic, PCB ass’y or module is replaced with a new one. No. of pin Resistance value 800 Ω ± 200 Ω No.3 and No.6 800 Ω ± 200 Ω No.2 and No.7 70 Ω...
There are many cases in which this is repaired by cleaning and lubricating of the movement. There are two types of modules/with movement used in Casio watches, namely plastic movements and metal movements. Although plastic movements require little maintenance such as regular lubrication, they are more susceptible to shock than metal movements, thus requiring that caution be used when handling parts.
15-3 Explanation of Each Part of Module/with movement Modules/with movement can be broadly divided into the train wheel unit, correcting unit and calendar unit according to their respective functions. 15-3-1 Train Wheel Part The train wheel unit is composed of the stepping motor (coil ass'y, stator and rotor), wheel/fifth (wheel/ intermediate), wheel/second, wheel/third, wheel/cannon pinion (ass'y), wheel/minute and wheel/hour.
When the crown is turned in this state, rotation is transferred in the order of the crown, wheel/sliding pinion, wheel/setting and wheel/minute. The wheel/minute causes the wheel/hour and wheel/cannon pinion to rotate resulting in movement of the hand/minute and hand/hour. (Fig. 15-3) Since only a portion of the wheel/cannon pinion rotates at this time, rotation is not transferred to the wheels/second and third.
2) Place all the component parts, except for the rotor, in Rotor the cleaning fluid and clean each part with a cleaning brush. Clean the areas around lubrication points par- ticularly carefully. 3) Component parts may also be cleaned by pouring Tweezers cleaning fluid into an ultrasonic cleaner instead of per- forming steps 1) and 2) above.
15-4-4 Confirmation When all parts have been assembled, install the battery and with the crown pulled out, set temporarily the hand/second and push in the crown to see if the watch runs. If the hand/second moves normally, remove the hand/second and install the wheel/hour, washer, dial and hands (hour, minute and second) to the movement.
5) On using both silicone rubber and heat seal tip, perform the thermal compression bonding by touching the soldering iron vertically to heat seal and LCD from upper side as shown in drawing with following conditions. Pressure: 10kg/ cm Pressing time: approx. 10 seconds. Firstly make the bonding at both end to fix the position of the heat seal on LCD, and then make the bonding to the rest.