ServiceBuBetin

r,™
NO. 28
ServiceBuBetin
PARTS CHANGE INFORMATION
FOR
CAL. 5M42A, 5M43A & 5M45A
The generating coil block for Cal. 5M42A, 5M43A and 5M45A has been changed for the purpose of
enhancing the electricity-generating efficiency of those watches. Besides this change, the antimagnetic shield plate was removed from the main plate of Cal. 5M42A and 5M43A. These changes
will be in effect for the watches produced in and after April 1995.
1. CALIBRES TO BE PROVIDED WITH NEW PARTS
Generating coil block: Cal. 5M42A, 5M43A and 5M45A
Main plate
2.
: Cal. 5M42A and 5M43A
REASONS FOR THE CHANGE
•
G e n e r a t i n g coil b l o c k (For C a l . 5 M 4 2 A , 5 M 4 3 A a n d 5M45A)
For the purpose of enhancing the electricity-generating efficiency of the watches and thereby
reducing the time during which the watch should be worn on the wrist until the capacitor is
fully charged, a generating coil block for exclusive use with Cal. 5M42A, 5M43A and 5M45A
was developed.
•
M a i n plate (For C a l . 5 M 4 2 A a n d 5M43A)
Up to now, an anti-magnetic shield plate has been welded to the main plate to prevent the coil
block for watch operation from being affected by the A C magnetic field, which is generated
when the capacitor is overcharged. The IC was upgraded to take over this preventive measure;
therefore, the anti-magnetic shield plate has been removed from the main plate, taking the
occasion of renewing the generating coil block. Please note that the main plate for Cal. 5M45A
will not be changed as the anti-magnetic shield plate for this calibre is a separate part affixed
to the main plate with screws.
A s a result of this change. Cal. 5M42Aand 5M43Awill use the samemain plate as usedforCal.
5M23A.
SEIKO CORPORATION
1
^
—
Old
New
For conventional case type
(For both Cal. 5M42A and 5M43A)
0100 669
(With anti-magnetic shield plate)
0100 660
(Without anti-magnetic shield plate)
For one-piece case type
(For both Cal. 5M42A and 5M43A)
0100 659
(With anti-magnetic shield plate)
0100 663
(Without anti-magnetic shield plate)
* The old and new main plates can be identified by checking whether the anti-magnetic shield plate is
welded on or not.
DIFFERENCES BETWEEN OLD AND NEW PARTS
Generating coil block
Part No.
Old
New
4002 519
4002 515
White
^^^^^^^^^^^^Red^^
^^^^^
Color of coil frame
0100 669
(For conventional case type)
0100 660
(For conventional case type)
0100 659
(For one-piece case type)
0100 663
(For one-piece case type)
Main plate
COMBINED USE OF OLD AND NEW PARTS
The old and new parts can or cannot be used in combination as follows.
Generating coil block
^
^
^
^
^
^
Old
4002 519
New
4002 515
Old
0100 669
0100 659
(With anti-magnetic shield plate)
YES
YES
New
0100 660
0100 663
(Without anti-magnetic shield plate)
NO*
YES
Main
plate
* Important:
Never use an old generating coil block (4002 519) together with a new main plate (0100 660 orOIOO 663),
which does not have an anti-magnetic shield plate welded to it. Otherwise, loss/gain of time may be
caused by the magnetic field.
CHANGES IN "VALUE CHECKING AND ADJUSTMENT"
Following the introduction of the new generating coil block, some values for checking and
recharging of Cal. 5M42A and 5M43A should be renewed. Please revise the corresponding values
in "VALUE CHECKING AND A D J U S T M E N T " in your "PARTS CATALOGUE/TECHNICAL GUIDE
Cal. 5M42A, Cal. 5M43A" as follows.
•
Value checking
Old
New
4002 519
4002 515
(With white coil frame)
(With red coil frame)
Generating coil block resistance
280 n ~ 380 ü
1.9 kii ~ 2.3 kil
Increase in capacitor voltage
after about 100 swings
More than 0.1 V
More than 0.05 V
^
•
^
^
^
^
Recharging Information
Duration of charge
Quick movement of the second
hand when the power reserve
indicator function is activated
Number of swings
Old
New
100
100-150
Approx. 6 hours
5 seconds
400
500 - 600
Approx. 2 days
10 seconds
700
1,000 - 1,300
Approx. 4 days
20 seconds
1,100
1,700 - 2,000
Approx. 7 days
30 seconds
Note: The new generating coil block requires more swings to fully charge the capacitor, but it enhances
the electricity-generating efficiency when the watch is worn on the wrist.
REMARKS
Due to the change of the generating coil block for Cal. 5M42A, 5M43A and 5M45A, the new part
has lost interchangeability with the generating coil block for Cal. 5M22A and 5M23A. The
capacitor for Cal. 5M22A and 5M23A has different characteristics from that for Cal. 5M42A, 5M43A
and 5M45A and the use of the new generating coil block for Cal. 5M22A and 5M23A will require
more time to increase the voltage up to such a level that the second hand starts moving. Be sure,
therefore, to use a generating coil block for exclusive use for each calibre.
NOTE O N CURRENT CONSUMPTION FOR CAL. 5M42, 5M43 & 5M45
We are announcing the correction of the current consumption figures described in the PARTS CATALOGUE/TECHNICAL
GUIDE and PARTS LIST for the above calibres as follows:
—
Present figures
Corrected figures
For the whole movement
Less than 0.7 ^A
Less than 0.9 ^A
For the circuit block alone
Less than 0.4 ^lA
Less than 0.5 \iA
For the whole movement
Less than 1.0 ^A
Less than 0.9 ^A
For the circuit block alone
Less than 0.5 ^A
Less than 0.5 \LA
—
5M42
5M43
5M45
* This correction is not related to the before-mentioned specification change of the coil block.