=
22
TECHNICAL GUIDE
Cal. 4F32A, 8F32A, 8F33A, 8F35A
[C] Exam ple of the tim e accuracy adjustment
Step 1 Measure the loss/gain of the w atch w ith the case back closed.
Obtained loss/gain: +0.180 sec./day
Step 2 Find the am ount of deviation from the allow able range of loss/gain betw een +0.020 and
+0.140 sec./day.
Deviation from the allowable accuracy: +0.180 – (+0.140) = +0.040 sec./day
Step 3 Remove the circuit block and adjust the accuracy.
Find a value of loss/gain from the table above that can offset the deviation obtained
in Step 2 and bring the loss/gain w ithin the allow able range. In this exam ple, –0.064
sec./day is adequate, so cut the pattern P2.
Step 4 Install the circuit block you have adjusted to the m ovem ent, and measure the loss/gain of
the watch with the case back closed to check if the obtained loss/gain is within the allow able
range between +0.020 and +0.140 sec./day.
[D] Remarks on m easuring the tim e accuracy
• Measure the loss/gain at a temperature range of 23° C ± 2° C w ith hum idity between 50% and 60%.
• If you hold the watch in your hand for a long time before m easuring the accuracy, the temperature
of the watch itself will rise and a stable measurement may not be obtained even in the environment
specified above. In that case, leave the watch untouched in the above environm ent for a sufficient
period of tim e, and then, start the measurem ent.
• Use a quartz tester QT-2100 that can measure a loss/gain up to 0.001 sec./day.
■ Tips on repairing
The follow ing are the troubleshooting guide for the problem s particular to Cal. 4F32A, 8F32A, 8F33A and
8F35A.
Problem
The date dial w ill not
move or the date does
not change properly.
Possible cause
1) Wrong calendar data w as input.
2) Defects in the ultrasonic motor
3) Defects in the circuit block and
contact point springs
Remedies
1) New ly input the calendar data.
2) Check the wheels around the ultrasonic
motor.
3) Replace the circuit block, 24-hour
contact point spring and date driving
contact point spring all in a set.
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