Seiko 6T63A Technical Manual page 19

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 operate
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.
A n e x c e s s i v e l o a d i s b e i n g
a p p l i e d t o t h e c h r o n o g r a p h
wheels due to dust or foreign
par ticles adhering to them or
oil starvation.
There is a crack on the circuit
block switch pattern.
The step motor has been deformed.
The amount of oil around the
buttons is insufficient.
T he cir cuit 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.)
A n e x c e s s i v e l o a d i s b e i n g
applied due to friction among
t h e h o u r, m i n u t e a n d S T O P -
WATCH hands.
Water resistance is deteriorated.
The watch has been subjected to
water pressure that exceeds the
guaranteed degree.
19/19 Copyright©2012 by
Cal. 6T63A
Solutions
Measure the coil block resistance.
Replace the coil with a new one if
necessary.
Cl e an th e r e l evan t p ar t s an d
l u b r i c a t e w i t h a n a d e q u a t e
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
n e c e s s a r y m e a s u r e s , w h i l e
cleaning inside of the watch.