Problems Possible causes Methods of repair and checking
The quickness of the hand
movement after the activation
of the time relay function has
reduced a little.
1) The coil for detecting
generation of the hour and
minute coil block is broken.
1) Check the resistance of the coil
for detecting generation. Replace
the hour and minute coil block if the
coil is broken.
The oscillating weight rotates
at an abnormally high rate,
and no charging is made.
1) The coil of the generating
coil block is broken.
2) The pivot of the generating
rotor is broken. (The pinion of
the generating rotor and the
gear of the intermediate wheel
for generating rotor are out of
mesh.)
1) Check the resistance of the
generating coil block. Replace the
generating coil block if the coil is
broken.
2) Remove the broken piece of the
generating rotor, and replace and
lubricate the generating rotor.
(Overhaul and clean if necessary.)
The oscillating weight will not
rotate.
1) The gear of the oscillating
weight and the pinion of the
intermediate wheel for
generating rotor are out of
mesh.
2) The pivot of the generating
rotor is broken. (The pinion of
the generating rotor and the
gear of the intermediate wheel
for generating rotor engage
with each other.)
1) If the gear of the oscillating
weight and the pinion of the
intermediate wheel for generating
rotor are intact, reassemble them to
the movement.
2) Remove the broken piece of the
generating rotor, and replace and
lubricate the generating rotor.
(Overhaul and clean if necessary.)
The current consumption for
the whole of the movement
exceeds the standard value.
1) When the measurement is
made, the IC is still in the
quick start mode. (When the
current consumption
measures about 200μA, it is
likely that the IC is in the quick
start mode.)
2) The load applied on the
gear train, etc. has increased,
and the driving pulse to
compensate it has been
generated.
1) After connecting the tester, move
the oscillating weight more quickly
for a longer period of time, and
then, make the measurement again.
2) If the current consumption for
the circuit block alone is within the
standard value range, overhaul and
clean the movement parts, and
then, make the measurement again.
Cal. 7D56A
43/44
Technical guide
Problems, causes and methods of repair
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