Download Print this page

Bulova ACCUTRON QUARTZ 245 Technical Bulletin page 6

Advertisement

LUBRICANTS:
Setting and Calendar Mechanism
UseOL206
Day/DateJumper
Use KT-22
Rotor Bushings
Use OL 216
CHECK THE FOLLOWING
MECHANICAL POINTS:
1) Hand adjustment;
hands level, not touching dial
markers, each other, rubbing on underside of crystal.
2) Calendar mechanism free from binding against
dial, etc.
3) Setting mechanism is free.
4) Seconds stop lever must not be bent or distorted,
nor touch the second wheel when the setting stem
is in the 1st or 2nd position.
CHECKING THE WHEEL TRAIN
Because the rotor is held by its own magnetic field,
it does not allow the train wheels to turn freely. Nev-
ertheless, a check should be made that each wheel
has sufficient end and side play.
CHECK THE FOLLOWING
ELECTRICAL POINTS:
1) Screws holding the electronic circuit are tight.
2) Cell strap insulator is in place.
3) Printed circuit leads properly contact coil contact
and cell strap. Contacts must be clean for proper
contact.
TRIMMER
Check solder points at trimmer supports. Faulty
solder points will cause erratic rate during regula-
tion or stopper.
CHECKING THE COMPONENTS
Note: The following components
can be tested
and replaced, if necessary, without removing the
movement from the case (See Pages 4 and 5 for
basic test
procedures):
1. Power Cell (#20.570)
2. Electronic Circuit (#10.513)
3. Coil Assembly Winding (#20.590)
Note: The electronic circuit is also referred to as the
"P.C. (Printed Circuit) Board."
6
REMOVING THE COMPONENTS
ELECTRONIC CIRCUIT
Using a tweezer, grip the p.c. board by the ceramic
portion.
Do not touch circuit board with
fingers,
or
scratch the printed circuit with the tweezer.
COIL ASSEMBLY (Winding)
Use a tweezer to grasp the coil core using the bare
hole end and not the end containing the connec-
tions to the printed circuit.
STEPPING ROTOR
Handle rotor by its pinion and not the magnet.
DIALING
Calendar Mechanism: Turn hands clockwise until
DATE
changes (disregard Day Indicator). Push
Crown
"in" (Position 1). Assemble Minute and Hour Hands
at the 12 o'clock position.
Second
Hand: When redialing, wait
until
motor has
indexed a few times, then pull crown to the "out"
position (Position 3). While holding in position, align
the sweep hand with the 12 o'clock marker, and
press hand into place.
The second hand is counterpoised.
If replacement
is necessary, use only genuine replacements.
HELPFUL HINTS
To Open Case:
Use a piece of plastic sheet between the case
opener and case to prevent damage to the case.
Tight Cannon Pinion:
Either lack of lubrication or foreign matter between
the cannon pinion and the centerwheel
post can
cause the pinion to bind, causing damage to the
minute wheel, hour wheel and minute post. The
cannon pinion must be removed during servicing.
The center wheel post and cannon pinion must be
lubricated to prevent damage to the dial train.
Removing Hands:
The cannon pinion may lift during hand removal.
Make certain to lower cannon pinion before advanc-
ing to the next operation. If the cannon pinion is not
lowered, damage may occur to the
dial
train during
attempts at setting the watch.
Burred Screw Head:
Do not burr the date indicator maintaining plate screw
slot. Burrs may cause the day indicator to bind.

Advertisement

loading

This manual is also suitable for:

Accutron quartz 246