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TECHNICAL GUIDE
Symptom
STOPWATCH
O n e o r m o r e S T O P -
W A T C H h a n d s h a v e
stopped moving or show
an abnormal movement.
The step motor shows an
abnormal movement.
The buttons do not oper-
ate normally.
The crown falls off.
Exterior
parts
The current consumption
exceeds the standard value.
Small amount of water/
blur inside of the glass
persists.
Possible causes
The relevant coil is broken.
An excessive load is being ap-
plied to the chronograph wheels
due to dust or foreign particles
adhering to them or oil starva-
tion.
There is a crack on the circuit
block switch pattern.
The s tep motor has b e en de -
formed.
The amount of oil around the but-
tons is insufficient.
T he cir cui t blo c k pa t tern has
been broken or bent.
The winding stem is not securely
installed. (the setting lever and
yoke are disengaged.)
An excessive load is being ap-
plied due to friction among the
hour, minute and STOPWATCH
hands.
Water resistance is deteriorated.
The watch has been subjected to
water pressure that exceeds the
guaranteed degree.
17/17
Copyright©2008 by
Cal. 7T85A
Solutions
Measure the coil block resist-
ance. Replace the coil with a new
one if necessary.
Clean the relevant parts and lu-
bricate with an adequate amount
of oil.
Replace the circuit block with a
new one.
Replace the stator with a new
one.
Clean the buttons and lubricate
appropriately.
Adjust the circuit block pattern
or replace the circuit block with a
new one.
Check the main plate, winding
s tem, set ting lever and yoke.
Replace the defective parts with
new ones.
Adjust or remount the relevant
hands.
Investigate the causes to take
necessary measures, while clean-
ing inside of the watch.
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