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Summary of Contents for Seiko 7T94A
- Page 2 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE III. REMARKS ON DISASSEMBLING AND REASSEMBLING ● Hands • Caution for disassembling The hour wheel is made of engineering plastics. When pulling out the hour hand, take care not to damage the hour wheel. • How to install 1) Pull out the crown with winding stem to the second click.
- Page 3 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE • Lubricating After installing the pins for date dial guard, lubricate the wheel edge of both the date driving wheel and date dial. Date jumper AO-3 (or MS-A) 8 Hour wheel When installing the hour wheel, check that it engages with the pinion of the minute wheel.
- Page 4 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE Circuit block cover • How to remove 1) Loosen the four circuit block cover screws. 2) Release the four hooking portions of the circuit block cover (indicated by the arrows in the illustration below.) • How to install 1) Have the four hooking portions of the circuit block cover (indicated by the arrows in the illustration below) catch the movement securely.
- Page 5 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE Circuit block • Caution for disassembling The circuit block is fixed to the train wheel bridge with the guide pins (“a”,“b”,“c”,“d” and “e” in the illustration shown below). When removing the circuit block from the guide pins, take care not to damage the circuit block.
- Page 6 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE Pin for train wheel bridge • How to remove Turn the pin 90 degrees counterclockwise with a screwdriver to loosen it. • How to install Set the pin in the direction as shown below. Then, turn it 90 degrees clockwise with a screwdriver to fix it.
- Page 7 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE ● Wheels and pinions Notes: CAL. 7T62A: Intermediate minute counting wheel and intermediate alarm wheel can be used interchangeably. CAL. 7T92A: Intermediate wheel for second counting (1/20) and intermediate minute counting wheel can be used interchangerably.
- Page 8 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE The illustrations refer only to Cal. 7T62A & 7T94A. 31 0270 582 <7T62A> 30 0950 590 37 4146 710 32 0261 582 <7T62A> Center wheel for alarm Intermediate alarm wheel Alarm rotor Minute wheel for alarm 0817 508 <7T94A>...
- Page 9 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE The illustrations refer only to Cal. 7T92A. 31 0270 582 30 0950 590 32 0261 582 37 4146 710 Minute counting wheel I n t e r m e d i a t e m i n u t e...
- Page 10 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE • Setting position and lubricating AO-3 (or MS-A) Switch lever (A) SEIKO Watch Oil S-6 Setting lever Yoke Train wheel setting lever Train wheel setting lever Yoke Setting lever Switch lever (A) Winding stem Center wheel and pinion...
- Page 11 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE Main plate • Lubricating Switch lever axle for switch lever (B) AO-3 (or MS-A) AO-2 (or MS-F) SEIKO Watch Oil S-6 22/27...
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Page 12: Function Checking
(when the stopwatch is not used) For the circuit block alone Less than 0.20 mA (with 1.55 V supplied from a battery) When measuring the current consumption with SEIKO Multi-Tester S-860, select the measurement range as follows: For the whole movement Use the range of 40 mA of SUPPLY V (= 1.55 V) &... - Page 13 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE 1. Checking for Standard Measurement/Accumulated Elapsed Time Measurement CAL. 7T62A CAL. 7T94A CAL. 7T92A Press repeatedly to check Press repeatedly to check Press repeatedly to check if the stopwatch 1/5 if the stopwatch 1/5 if the stopwatch 1/20...
- Page 14 Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE ● ALARM FUNCTION (Only for Cal. 7T62A) • Before checking the alarm function, set the time and alarm hands to the current time following the procedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE.” ❖ To Set the Alarm Time CROWN Pull out to the 1st click.
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Page 15: Troubleshooting
Cal. 7T62A/7T92A/7T94A TECHNICAL GUIDE VI. TROUBLESHOOTING Symptom Possible causes Solutions Measure the battery voltage. Movement T h e w a t c h s t o p s The battery has been depleted. Replace the battery with a new operating. -
Page 16: Technical Guide
Replace the circuit block with a The upconverter coil is broken. The alarm does not new one. sound. (For 7T62A only) Remount the piezoelectric The Piezoelectric element is element or replace it with a new broken or out of alignment.
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