Download Print this page

Casio PRT-40C Repair Manual

Men's wristwatch
Hide thumbs

Advertisement

Table of Contents
WATCH BASIC
REPAIR MANUAL
(RANKS A AND B)
JULY 1997
PRT-40C
ABX-68B
MWA-800G
(QW-1470)
(QW-1359)
(QW-1325)
INDEX
R

Advertisement

Table of Contents
loading

  Related Manuals for Casio PRT-40C

  Summary of Contents for Casio PRT-40C

  • Page 1 WATCH BASIC REPAIR MANUAL (RANKS A AND B) JULY 1997 PRT-40C ABX-68B MWA-800G (QW-1470) (QW-1359) (QW-1325) INDEX...
  • Page 2: Table Of Contents

    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...
  • Page 3 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) ........
  • Page 4 15-4-2 Cleaning ......................... 44 15-4-3 Lubrication and Reassembly .................. 45 15-4-4 Confirmation ......................46 16. Clock Repair (Heat Seal Replacement) .............. 46...
  • Page 5: Flow Chart For Repair Of Module Without Movement

    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.
  • Page 6: Flow Chart For Repair Of Module With Movement

    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...
  • Page 7: Flow Chart For Repair Of Casing Parts

    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.
  • Page 8: Circuit Explanation Of Quartz Watches

    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.
  • Page 9: Digital Quartz Watches

    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.
  • Page 10: Measurement Of Current Consumption (Oscillation Check)

    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.
  • Page 11 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.
  • Page 12: Quality Evaluation And Replacement Of Electronic Parts

    3. Quality Evaluation and Replacement of Electronic Parts Tool used NO. Code No. Tool name 1904 5153 HP-fingerstall (two set) 1904 5277 Multimeter 1901 9523 Precision tweezers Terminals 4-1 1904 1667 Soldering iron (110 V/117 V) for solder 4-2 1904 1668 Soldering iron (220 V) Ceramic 1901 9868 Solder wick 1901 9401 Solder...
  • Page 13: Transistors

    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...
  • Page 14: Accuracy Setting Method For Casio Watches

    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.
  • Page 15: Accuracy Setting By Pad Selection

    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.
  • Page 16: Lcd Replacement

    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.
  • Page 17 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.
  • Page 18: Names Of Casing Parts

    7. Names of Casing Parts 7-1 G-Shock Bezel Screw/Decorative Button ass'y (10H) Button ass'y (6H) Protector/ Screw/Decorative Case back Glass & packing Packing/Glass Case/Center ass'y Button ass'y (2H) Protector/Case back Button ass'y (4H) Button ass'y (8H) Dial (Inner) E-ring Dial (Outer) Cover/Inner Cushion/Rubber (Inner) Module/without movement...
  • Page 19: Baby-G

    7-2 Baby-G Protector Bezel Screw/Decorative Screw/Decorative Case/Center ass'y Glass & packing Button ass'y (10H) Packing/Glass Button ass'y (8H) Cover/End piece E-ring Spring rod Button ass'y (2H) Spring rod Button ass'y (4H) Cover/End piece Dial Cover/Inner Cushion/Rubber (Inner) Tape/Adhesive Module/without Movement Cushion/Rubber (Back) Packing/O-ring (Back) Cover/Back ass'y...
  • Page 20: Twincept

    7-3 Twincept Screw/Decorative Button ass'y (10H) Button ass'y (Light) Bezel Cushion Button ass'y (8H) Case/Center ass'y Button ass'y (2H) E-ring Button ass'y (4H) Interconnector Dial supporter Rubber/Conductive Hand/Minute Hand/Hour Dial/EL Module/with Movement Screw/Tapping Spring/Coil Spring/Coil Packing/O-ring (Back) Cover/Back ass'y Screw (Back) —...
  • Page 21: Data Bank

    7-4 Data Bank Panel Button ass'y (light) Button ass'y (10H) E-ring Button ass'y (9H) Case/Center ass'y Button ass'y (2H) Button ass'y (3H) E-ring Module/without Movement Plate Tape/Adhesive Casing frame Seal Tape/Conductive Packing/O-ring (Back) Piezo Tape/Adhesive Cover/Back Screw (Back) — 17 —...
  • Page 22: Diver's Watch

    7-5 Diver's Watch Screw/Decorative Bezel Panel Tape/Adhesive Register ring Spring/Leaf Glass & packing Packing/Glass Packing/O-ring Bezel ring Button ass'y (10H) Case/Center ass'y Button ass'y (8H) Button ass'y (2H) E-ring Button ass'y (4H) Dial supporter Hand/Minute Hand/Hour Module/with Movement Casing frame Packing/O-ring (Back) Cover/Back Screw (Back)
  • Page 23: Watches Equipped With A Sensor/Pressure (Side Sensor)

    7-6 Watches Equipped with a Sensor/Pressure (Side Sensor) Case/Center ass'y Register ring E-ring Screw (Dorative piece) Button ass'y (2H) Packing/O-ring Packing/O-ring (Sensor) Piece/Decorative (9H) Plate (sensor) Screw (Decorative piece) Piece/Decorative (3H) Screw Button a'ssy (10H) Plate/Protection Button a'ssy (8H) Cover/Sensor Button a'ssy (Light) E-ring Button a'ssy (4H)
  • Page 24: Watches Equipped With A Sensor/Pressure (Front Sensor)

    7-7 Watches Equipped with a Sensor/Pressure (Front Sensor) Screw/Decorative Panel Button ass'y (10H) Button ass'y (8H) E-ring E-ring Button ass'y (2H) Packing/O-ring (Sensor) Button ass'y (4H) Sensor/Pressure Case/Center ass'y Casing frame Holder Screw Module/ without Movement (Sensor) Packing/O-ring (Back) Cover/Back ass'y Screw (Back) —...
  • Page 25: Replacement Of Casing Parts

    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.).
  • Page 26: Button Replacement

    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.
  • Page 27: Register Ring Replacement

    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.
  • Page 28: Analog Block Replacement

    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).
  • Page 29 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.
  • Page 30: Waterproof Inspection

    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.
  • Page 31: Water Resistant Tester

    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.
  • Page 32: Air Leak Checker

    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.
  • Page 33 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.
  • Page 34: Water Pressure Tester And Hot Plate

    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.
  • Page 35 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.
  • Page 36: Quality Evaluation And Replacement Of Sensor/Pressure

    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.
  • Page 37: Trouble Shooting With Sensor/Pressure Trimming Jig Set

    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...
  • Page 38: Trouble Shooting Without Sensor/Pressure Trimming Jig Set

    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...
  • Page 39: Sensor/Pressure Quality Evaluation

    11-3 Sensor/Pressure Quality Evaluation Sensor Tool used NO. Code No. Tool name 1901 9708 Aneroid barometer (3-1050-05) 1901 9672 Precision screwdriver set 1901 9523 Precision tweezers F. P. C. 1904 5277 Multimeter Joiner 1901 9924 Pressure sensor trimming jig set 1901 9949 Holder (for ALT-6000) Holder (Universal) 1901 9519 Blower brush...
  • Page 40: Sensor/Pressure Equipped On Front Of The Watch

    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.
  • Page 41: Quality Evaluation And Replacement Of Sensor/Magnetic

    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.
  • Page 42: Quality Evaluation Of Sensors/Magnetic

    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...
  • Page 43: Repair Of Module/With Movement

    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.
  • Page 44: The Structure And Names Of Parts Of Module/With Movement

    15-2 The Structure and Names of Parts of Module/with movement (Train wheel side) Screw Bridge/Train wheel Wheel/Third Wheel/Fifth Wheel/Second Rotor Bridge/Cannon pinion Screw Jumper/Setting lever Lever/Setting Wheel/Minute Wheel/Cannon pinion Wheel/Setting Yoke Coil ass'y : Moebius 8031 Stator : Moebius D-5 Wheel/Sliding pinion Pin/Setting lever Plate/Main...
  • Page 45 (Minute train side) Holder/Movement Spring/Coil Holder/Hour wheel C-ring Indicator/Day Screw Jumper/Date indicator Wheel/Driving calender Lever/Date stop Lever/Day setting Indicator/Date Plate/Date indicator guide Wheel/Hour — 41 —...
  • Page 46: Explanation Of Each Part Of Module/With Movement

    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.
  • Page 47: Calendar Part

    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.
  • Page 48: Disassembly, Cleaning, Lubrication And Reassembly Of Module/With Movement

    15-4 Disassembly, Cleaning, Lubrication and Reassembly of Module/with movement Tool used NO. Code No. Tool name 1904 5153 HP-fingerstall (two set) 1901 9672 Precision screwdriver set 1901 9523 Precision tweezers 1904 1647 Anti-mafnetic screw driver set 1904 1648 Rodico 1904 1646 Anti-magnetic tweezers 1904 1671 Movement holder 1904 5155 Movement placing block 9-1 1904 1654 Eye lens (2.0 magnification)
  • Page 49: Lubrication And Reassembly

    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.
  • Page 50: Confirmation

    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.
  • Page 51 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.
  • Page 52 MA0700271A...

This manual is also suitable for:

Mwa-800gAbx-68b